Decisions Log

2026-06-25 — Pull Loft Subpanel Forward + Temporary Window-AC Cooling for Summer Loft Work

• Area: design/interior/loft/electrical + hvac
• Decision: Install the 100A loft subpanel + feeder early (ahead of its original sequence) and rough three 20A/120V branch circuits now — two at the south dormers + one central construction/tool circuit — each fed from the loft subpanel and each doubling as a permanent loft receptacle. For summer work comfort, run two used 12,000-15,000 BTU window A/C units (one per south dormer) as a temporary measure while the loft is uninsulated, then resell them the following summer to recover most of the cost.
• Status: ✅ Decided (approach); subpanel install + circuit rough-in pending; A/C units sourced 2026-06-25 — borrowing four (5k/8k/12k/18k BTU) from coworker Dan Riehl for the summer ($0, no used purchase); pickup + condition-check and 18k voltage check pending
• Why:
  • Heat is a real hazard: the loft work has to be done before insulation — i.e. under a bare roof deck in mid-summer, where an uninsulated loft runs 100-120°F+. Window A/C makes a work zone survivable (heat exhaustion is a genuine solo-DIY risk).
  • Window over portable: more efficient, cheaper used, easier to resell, and avoids the single-hose portable’s negative-pressure problem in a leaky uninsulated space. The two south dormers suit temporary window installs.
  • Dedicated circuits beat extension cords: manufacturers want room A/Cs on a wall receptacle; pulling the real circuits now removes any long-term cord run and is the safer install.
  • Low incremental cost: materials are already on hand (1,000’ 12/2 spool, spare 20A GFCIs, 4-5 spare breakers, boxes — all new), so moving the subpanel up is cheap.
  • No rework: the early circuits are permanent loft receptacles, and feeding them from the loft subpanel keeps the existing “all loft circuits originate at the subpanel” architecture intact (not temporary taps off the main panel).
• Key points:
  • Each circuit: 20A/120V, 12/2 Cu + ground, GFCI-protected, loft-subpanel-fed. Dwelling-grade AFCI / dual-function applies later when the loft is finished, per the subpanel protection matrix.
  • Subpanel grounding: neutral and ground bars stay separate (not bonded) — the #1 DIY subpanel mistake; 4-wire feeder.
  • Used-buying criteria captured in the HVAC doc (12-15k BTU, 120V, intact LCDI plug, no mold, cold in minutes, seller demo; fair used ~$125-225bysize).\ast \ast Borrow-firstpaidoff:\ast \ast fourunitslentbycoworkerDanRiehl(5k/8k/12k/18k)for$0 — return next summer rather than resell. Only two dormers take window units at once, so likely pairing is 12k + 8k, 5k as a tent spot-cooler; the 18k is held pending a voltage check (≥18k window units are commonly 240V and would not run on the 120V dormer circuits).
• Related: Construction-Phase Early Circuits (Pull-Forward), Temporary Construction-Phase Cooling (Uninsulated Loft), Loft Subpanel + Construction-Phase Cooling (added 2026-06-25)

2026-06-23 — Loft Bathroom: LVP + Prefab Curbed Shower (Not a Wet Room) + Layered Laundry Leak Protection

• Area: design/interior/loft/bathroom/plumbing
• Decision: Finish the loft bathroom with LVP floor + a prefab curbed shower pan/surround — not a tanked wet room. Put the laundry in the bathroom (heat-pump washer/dryer stack preferred, or all-in-one combo — both ventless). Protect against washer leaks with a layered package: catch pan → HepvO waterless trap → tie into the washer drain DOWNSTREAM of its P-trap, plus a leak sensor + auto-shutoff valve.
• Status: ✅ Decided (approach); fixture layout + product SKUs + inspector confirms pending
• Why:
  • No wet room: a true curbless wet room needs the shower subfloor recessed below the surrounding floor, but the attic-truss bottom chords can’t be notched (IRC R502.11.3 — same constraint as the DWV plan). The only no-cut path is building the whole bathroom floor up ~1.5–2.5″, which creates an annoying door step and adds cost — “very annoying for little benefit.” Wet room also forces tiling the whole floor → a second subfloor layer (LVP floats fine over 24″ OC; tile doesn’t).
  • Cost: wet room runs **~$900–1,500moreinmaterials\ast \ast (tilewholefloor+walls,lineardrain,subfloorupgrade)thanLVP+prefab($1,100–1,400 shower-specific, DIY). The prefab pan also has the fewest seams = lowest waterproofing risk over the shop below.
  • Leak protection rationale: this bathroom floor is the shop ceiling — a leak floods the lift/tools/electrical. A 1″ pan drain can’t keep up with a burst supply hose (~15–30 GPM); the auto-shutoff valve is what actually stops a catastrophic flood, the pan handles slow drips.
• Key points:
  • Tie the pan into the washer line downstream of the P-trap, NOT upstream into the standpipe — pump-out surges (~15–30 GPM) would back up a low standpipe tap and dump dirty water into the pan every cycle.
  • HepvO waterless trap on the pan branch: blocks sewer gas (no water seal to dry out on a rarely-used drain), is one-way (resists backflow), and reuses the existing drain with no new floor penetration.
  • No room floor drain — it fights the LVP (not sloped/sealed to a drain); the pan-to-DWV branch covers drainage instead.
  • Leak sensor makes a slow leak loud (answers the “piped-away leak runs unnoticed” objection) and can alert via the homelab network.
• Open / inspector-confirm: pan-to-DWV vs. required indirect/observable waste (Clare County); venting of the pan branch (may share washer wet vent); appliance stack-vs-combo selection; product SKUs at finish procurement.
• Related: Loft Bathroom Waterproofing, Loft DWV Plumbing Plan, Loft Flooring Plan, Loft Apartment Conversion Plan

2026-06-23 — Loft Finishings: Ceiling Fans (2 brace boxes), LVP over Laminate

• Area: design/interior/loft/finishes
• Decision: (1) Two ceiling fans in the loft — common-area center + future bedroom corner — both DC-motor with light, sloped-ceiling adapter where needed. Install fan-rated brace boxes at both locations now (pre-drywall); hanging the fans can be deferred (esp. the bedroom one until/if that corner is walled). (2) Flooring = rigid-core LVP (22 MIL) throughout, not the initially-considered laminate. (3) Lighting via slim canless LED wafer downlights + kneewall sconces (sloped insulation depth can’t fit standard cans). (4) Storage in the kneewall built-ins + dormer window seats (non-habitable <5’ zones).
• Status: ✅ Decided (fan locations, flooring type, lighting approach); fixtures are finish-phase purchases
• Why:
  • Fans complement the mini-split heads (destratification at the 11’3” peak → less runtime); a brace box is ~$15 now vs. opening a finished sloped ceiling later. Bedroom corner is already fixed (egress corner), so future-proof it now.
  • LVP over laminate: the unit has bath + future kitchen + W/D — laminate’s fiberboard core swells with water; LVP is waterproof, pairs with the acoustic underlayment for inter-floor IIC, and resists dents/casters. Rugs in living/bedroom for warmth (no radiant upstairs) + zoning.
  • Wafer lights: sloped sections have only ~5.75–6.25” insulation depth — standard cans don’t fit.
• Pre-drywall lock-ins created: fan brace boxes (×2), kneewall sconce boxes, optional heated-bath-floor circuit, range-hood vent path. Code flag: loft circuits are dwelling → AFCI (NEC 210.12), unlike the AFCI-exempt garage.
• Related: Loft Finishings Plan, Loft Flooring Plan, Loft Apartment Conversion Plan, Loft Finishings — Pre-Drywall Lock-Ins (added 2026-06-23)

2026-06-22 — Loft DWV: Drop Through Truss Bays, Collect Below Trusses (No Chord Drilling)

• Area: design/interior/plumbing
• Decision: Plumb the loft DWV without drilling the attic-truss bottom chords. Land every vertical drop in a truss bay (~22.5” clear at 24” OC — fits a 3”/4” closet bend, 2” shower trap, any branch), and run all horizontal collection below the trusses in a dropped soffit sloped to the mechanical-room sewer. Vents and short wall-fixture trap arms stay up in the loft (studs drill freely); only the lateral collector + fixture drops go down.
• Status: ✅ Decided (strategy); fixture layout + soffit route pending
• Why: The loft floor is attic-truss bottom chords (Letherer #123907) — IRC R502.11.3 prohibits drilling truss members without engineer approval, so horizontal drains can’t cross chords in the floor. Dropping through bays needs no drilling; collecting below the trusses gives unlimited slope/routing. The 10’ garage ceiling easily hides an 8–10” soffit. Inspector-friendly (exposed/accessible) even if slightly less tidy.
• Key points:
  • Wet-wall grouping: stack toilet + shower + lav on one wall → a single 3” drop/bay instead of three; group kitchen + laundry likewise. Fewer fire-rated-ceiling penetrations.
  • Shower trap depth: raised base/curb, or drop the trap into the bay below.
  • Fire separation (R302.6): drops through the 5/8” Type X garage ceiling need listed firestops; soffit-below-drywall keeps the horizontal pipe out of the membrane.
  • Soffit route along a perimeter/back wall, clear of the 2-post lift envelope + garage-door tracks, inside the conditioned envelope (Michigan winters).
  • Slope: 3” min (toilet), 1/4”/ft preferred; vents to the existing through-roof stack; confirm AAV acceptability under local code.
• Related: Loft DWV Plumbing Plan, 2026-06-22 — Cord-Reel Circuit Routing: Kneewall Chase, Do NOT Drill Truss Chords, Loft Bathroom Rough-In (from Loft Photo Analysis)

2026-06-22 — Cord-Reel Circuit Routing: Kneewall Chase, Do NOT Drill Truss Chords

• Area: design/interior/electrical
• Decision: Route the dedicated cord-reel 20A circuit through the kneewall chase, not by drilling straight through the loft floor framing. Panel → up into the kneewall chase (with the other first-floor home runs) → along the chase length-wise → drop into a single truss bay and run parallel to the chords out to each cord-reel box, feeding each box from within its own bay so the cable never crosses a chord.
• Status: ✅ Decided (routing); wiring pending
• Why: The loft floor is the bottom chord of pre-engineered attic trusses (Letherer Job #123907, 24” OC, 40 PSF). Truss members may not be cut, notched, or drilled without the truss engineer’s written approval (IRC R502.11.3) — so the “shortest path” option (drill through each floor member) is prohibited, would void the truss rating, and would fail inspection. Running the long direction perpendicular to the trusses crosses a chord every 24”; the kneewall triangular space is open/accessible and lets that travel happen with no chord penetration. Extra 12/2 is trivially cheap; bonus accessibility for future changes; matches the existing kneewall routing of the other circuits.
• Notes / exceptions:
  • Blocking between trusses is not a chord — it may be drilled if a short perpendicular hop needs it.
  • Some conventional infill floor joists (Simpson-hung, Dec 2025) exist at the stair opening / dormer pockets / floor edges. If a box lands under solid-sawn infill joists, drilling those is allowed per IRC R502.8.1 (hole ≤⅓ depth, ≥2” from edges) + NEC 300.4(A) (≥1¼” back or steel nail plate). Truss chords stay untouched.
  • Securing per NEC 334.30; accessible-attic cable within 7’ of the attic floor needs guard strips/running boards (NEC 334.23 → 320.23) — keep the run in the chase / along chord faces to avoid this.
• Related: 120V general-purpose circuits, Door Run), Critical Pre-Insulation Requirements

2026-06-22 — Low-Voltage Network: Keystone Everything, Pull-Now/Terminate-Later, Main-Now/Loft-Later Zoning

• Area: design/interior/network
• Decision: Standardize all low-voltage drops on keystone jacks in open-back LV brackets (Arlington LV1/LV2; recessed media boxes behind wall TVs), feeding a 24-port keystone patch panel + 24-port PoE Brocade switch in the mechanical-room wall rack. Pull all cable + smurf tube (ENT) now, terminate only active drops (cameras, main AP, rack drops, and the patch-panel end of every run); leave speculative drops coiled with a service loop behind a bracket + blank plate, labeled both ends. Zone the network: the mechanical-room 24-port serves the main floor + 5 cameras + main AP now; a second 24-port switch/panel goes in the loft later, with its drop cable + an inter-rack ENT trunk pre-run now.
• Status: ✅ Decided (rough-in during interior buildout)
• Why: The on-hand gear is 24-port; the full drop plan (~27–32 terminations) exceeds it. Zoning main-now/loft-later fits the loft 100A-subpanel / future-apartment model and defers the second switch until needed. Pulling everything in re-pullable ENT now makes “terminate later” safe — a damaged or to-be-upgraded run can be replaced without opening walls.
• Added drop locations (beyond the existing plan): shop media/TV wall, service door (doorbell/access control), EV-charger drop, mechanical-room controls drop, optional opener drops.
• Note: budget for >1× 1000’ Cat6 spool (all drops + loft trunk exceed 1000’).
• Related: Termination & Switch Zoning Strategy (decided 2026-06-22), Boxes, Brackets & Plates, Main Floor Outlet & Circuit Layout

2026-06-22 — Cord Reels Split to Own 20A Circuit (off the Ceiling/Door Run)

• Area: design/interior/electrical
• Decision: Move the 2 drop-down cord reels off the shared ceiling/door run and onto their own dedicated 20A GFCI circuit. The ceiling/door run keeps the 3 garage-door openers + 4 front-wall (south door-wall) dual-gang outlets + camera/sensor outlets on the existing GFCI breaker (on hand). Decided with the owner after weighing a single-circuit-for-everything option.
• Status: ✅ Decided (rough-in pending; the 5 ceiling boxes were mounted 2026-06-22)
• Why: Openers (~5A, brief) and front-wall convenience outlets are featherweight loads. The cord reels are the high-draw wildcard — a reel typically feeds a real tool (shop vac, compressor, grinder, charger ≈ 10–15A), and the realistic conflict is a reel tool overlapping with another receptacle on the same 20A circuit (≥16A continuous → trip). Isolating the reels gives a reel tool the full circuit and keeps opener/front-wall power independent. Reasoning parallels the 2026-04-23 bay-lighting split (same doc) that already pulled overhead lighting off this run so a high-draw cord-reel tool couldn’t darken the bay under a raised lift.
• Mitigations noted: Genie openers have battery backup, so even a trip/GFCI fault on a shared circuit wouldn’t strand the doors — but the split is nearly free pre-drywall (one extra 12/2 home run + one breaker) and impossible to add cleanly after drywall. Garage is GFCI-required (NEC 210.8(A)) but AFCI-exempt (NEC 210.12).
• Options considered: (A) everything on one 20A — owner’s initial instinct; code-legal, simplest, occasional resets when a reel tool overlaps other use. (B) chosen — reels on their own 20A; openers + 4 south-wall outlets together on the existing GFCI breaker.
• Related: 120V general-purpose circuits, 2026-04-23 — Vehicle Bay Lighting Split to Dedicated Circuit, Electrical Service Installation — IN PROGRESS

2026-06-21 — Lift Safety Certification Guidance + Certified Low-Ceiling Options

• Area: design/interior/lift
• Decision: Documented lift safety-certification guidance in the lift doc. This is reference/guidance, not a purchase decision — lift selection remains deferred to stage 6. The cert that matters in North America is ALI Gold (ANSI/ALI ALCTV), independently tested by Intertek/ETL; verify any specific model in the directory at autolift.org.
• Status: ℹ️ Reference documented; lift selection still deferred to stage 6
• Key points:
  • The leading candidate GP-9LC is NOT ALI certified (per its own brochure) — BendPak’s value line by design. Not unsafe (automatic locks, arm restraints, lanyard release) but it lacks the independent 3×/5× structural validation a certified lift carries.
  • Certification is not legally required for this private, non-commercial garage (IBC/OSHA mandate it for commercial/permitted installs) — it’s a safety-margin and resale choice.
  • Floorplate vs. certification tension: the floorplate (no overhead crossbar) that lets a 2-post lift fit a 10’ ceiling is also what tends to disqualify it from ALI cert (slack-chain provision). Correction (2026-06-21, same day): an earlier draft wrongly listed the BendPak XPR-9S-LP as ALI certified. It is not — BendPak forgoes ALI certification on all its floorplate models, so both the GP-9LC and XPR-9S-LP are uncertified.
  • Certified models that fit a 10’ ceiling (now listed in Lift.md): Atlas Platinum PVL9BP (~111⅛”, baseplate, ALI+ETL — the standout certified + fits-10’ option; note Platinum ≠ budget BP8000); Forward BP-9 (~111”, marketed certified — verify). Challenger CLFP9 is certified but ~120.9” — just over a flush 10’. Rotary SPOA10 is certified but overhead (~12’) and does not fit.
  • GP-9LC vs XPR-9S-LP head-to-head added to Lift.md (both BendPak, both 9k, both uncertified, electrically identical for circuit planning). GP-9LC edges raw low-clearance; XPR-9S-LP buys Low-Pro arms + dual-width + faster rise. XPR-9S-LP manual saved to Manuals.
  • Certified low-ceiling options verified (2026-06-21): manuals pulled and cert confirmed for Atlas Platinum PVL9BP (ALI+ETL; 111⅛” overall; 208–240V 1Ph 2HP) and Forward BP9 (ALI+ETL, ANSI/ALI ALCTV, Intertek-administered; 111¼” overall; 2HP 20A). Both brands appear as participating manufacturers in the live ALI directory; exact-model directory search is a JS form to run manually at purchase. Both manuals saved to Manuals. These are the certified alternatives to the (uncertified) BendPak floorplate front-runners.
  • Pricing + color fit to garage scheme (verified 2026-06-21): garage scheme is monochrome gray/charcoal/silver + white. Atlas Platinum PVL9BP ships gray (standard Platinum finish — matches scheme) at ~$5,199\ast \ast bestprice.\ast \ast ForwardBP9\ast \ast standardisblue/yellow(clashes);the\ast \ast black\ast \ast SKU(‘BP9N100MBK‘)fitsbutruns\ast \ast$6,603. ⇒ Atlas PVL9BP wins on both color and price (~$1,400 cheaper, factory-gray, no special-order). Verified purchase links recorded in Pricing, color & where to buy (verified 2026-06-21). Both certified options sit well above the uncertified BendPak GP-9LC value tier.
• Related: Safety Certifications, Certified models that fit a 10’ (120”) ceiling

2026-06-20 — 240V Branch Wire Sizing (Gauge + Neutral) & Conduit Wire-Method Flag

• Area: design/interior/electrical
• Decision: Set the cable spec for every 240V branch by two criteria — gauge by amperage (20A→12, 30A→10, 50A→6 AWG copper) and conductor count by receptacle (NEMA 6-xx = no neutral → 2-wire; NEMA 14-xx = neutral → 3-wire). Corrected the schedule where it over-specified a neutral on no-neutral receptacles.
• Status: ✅ Decided (cable per circuit); ⏳ wire-method (NM-B vs THWN-2) open pending conduit verification
• Decisions made:
  • Welder (NEMA 6-50): 6/2, not 6/3. A 6-50 has no neutral; 6/2 w/G is code-minimum and 6/3 is materially pricier at 6 AWG with an unused neutral. (Schedule corrected from 6/3 → 6/2.)
  • Lift + compressor (NEMA 6-30): keep 10/3 (spare neutral). The neutral is unused today but cheap to carry at 10 AWG and future-proofs a later 14-xx swap with no re-pull — the “mixed” choice (future-proof the cheap 30A runs, code-minimum the expensive 50A welder).
  • EV (NEMA 14-50): 6/3 — the 14-50 requires the neutral (unchanged).
  • Mini-split (garage): 12/2, pending MrCool nameplate MCA/MOCP confirmation.
  • Added a 240V Wire & Cable Reference (sizing logic, per-circuit table, Southwire/Home Depot product links) to the electrical doc.
• Open item (flagged, not decided): the 240V home runs pass through embedded slab conduits. NM-B is not rated for wet locations (NEC 334.12); conduit in/under a slab is generally a wet location — so those segments may need THWN-2 individual conductors rather than Romex. Must confirm whether the slab conduit is a wet location before ordering 240V wire.
• Related: 240V Wire & Cable Reference, dedicated loads (2 poles each)

2026-06-20 — Lift Electrical Spec Verified (BendPak GP-9LC)

• Area: design/interior/electrical/lift
• Decision: Captured the BendPak GrandPrix GP-9LC manufacturer manual + brochure to the vault and verified its electrical requirements, replacing the prior “verify voltage/amp; often 220V/30A” placeholder. This is a spec confirmation, not a purchase decision — final lift selection remains deferred to stage 6 (post-build); the GP-9LC is the leading candidate.
• Status: ✅ Spec verified; ⏳ lift purchase still deferred to stage 6
• Verified spec (from BendPak docs): 208–230 VAC, 1-phase, ≈23A motor; manufacturer requires a 25A-minimum time-delay breaker/fuse on a dedicated circuit per power unit. Model is not offered as 110V standard (special voltages on request). Raised overall height 109.5” clears the 120” ceiling via the floorplate (no-crossbar) design.
• Implication: the already-planned 30A / 240V / NEMA 6-30 / 10-3 lift circuit with local disconnect between the bay-3 PEX-free pads covers it with margin — no change to the electrical rough-in. Note: BendPak ships the power unit with a pigtail and requires a licensed electrician to wire the power unit + disconnect (the one part of the lift hookup outside DIY scope).
• Related: GP-9LC Verified Specifications, dedicated loads, Vehicle Lift

2026-06-07 — Garage Floor Electrical: Completeness-Pass Additions

• Area: design/interior/electrical
• Decision: A full review of the main-floor electrical doc set found the plan already very complete — the Future-Proofing doc already covers whole-panel SPD, smoke/CO/heat interconnect, ENT chases, ground rod, CAT6 backbone, camera/WAP pre-wire, subpanel & 2nd-240V stubs, EV charging, generator interlock, and the UPS strategy. This pass closed the few remaining small gaps and pulled the siloed Future-Proofing “do-first” items into the active build.
• Status: ✅ Decided
• Decisions made:
  • Floor drain is gravity (sewer/daylight) → no sump-pump circuit needed.
  • Central vacuum + water softener run off general-purpose receptacles — no dedicated circuits (low/intermittent draw); keep the ~6A vac motor off the boiler-control circuit.
  • Defined the mechanical-room circuits: a UPS-backed rack/network circuit (the former vague “server rack circuit” — switch, PoE injector, NVR) and a boiler/pump control circuit with a reserved external-circulator contingency outlet (only used if the post-insulation Manual J shows the Navien internal pump is undersized).
  • Created a master Circuit Directory with a pole-count tally and an open action to confirm the panel’s actual space count — the SPD, loft 100A feeder, 2nd-240V stub, and 2nd EV receptacle are the 2-pole squeeze.
  • Elevated the Future-Proofing “do-first” items into a pre-drywall gate + To-Do tasks, and added the SPD and detector wire to procurement (designed but not previously in the buy pipeline).
  • Adopted minor conveniences: dedicated shop fridge/freezer circuit, ~2 additional exterior WP GFCI outlets, switched ceiling air-filter outlet, optional USB-C/USB-A at the bench, and a battery-backup egress light at the stair/exit.
• Options not chosen: dedicated circuits for the central vacuum / water softener (unnecessary at their draw); a sump-pump circuit (gravity drain — none needed).
• Related: Circuit Directory, Electrical Future-Proofing, Electrical Pre-Drywall Gate (Owner DIY) — do BEFORE insulation, Electrical — Pre-Drywall Gate & New Circuits (added 2026-06-07)

2026-06-07 — Stairwell Light on the Vehicle-Bay Lighting Circuit (Garage Main Panel)

• Area: design/interior/electrical/lighting
• Decision: Power the stairwell light from the garage main panel by sharing the dedicated 20A vehicle-bay lighting branch circuit — the same circuit whose 3-way already lands in the stairwell-bottom 2-gang box. Do not put the stair light on the future loft/apartment subpanel.
• Status: ✅ Decided
• Rationale:
  • Egress safety (the deciding reason): the stair is the means of egress from the loft, and its lighting must not depend on the power of the space being evacuated. Feeding it from the garage main — a different source than the future loft subpanel — keeps the stair lit if the loft loses power, trips, or (post-conversion) a tenant kills their own main. Extends the existing “hardwired 3-way so the stairs work without HA/Wi-Fi” resilience down to the circuit level.
  • Functionally garage-zone: the stairs are open to the garage floor with no door until the very top, so the stair light is effectively a garage light for that area.
  • Trivial load: <1A on top of the bay lights’ ~3–5A, on a 20A circuit. The bay circuit is lighting-only (isolated from openers / cord reels / receptacles per 2026-04-23 — Vehicle Bay Lighting Split to Dedicated Circuit), so nothing nuisance-trips it.
  • Simplest wiring / box fill: one feed — the 12/2 home run already coming to the stairwell-bottom 2-gang for the bay 3-way — powers both 3-way switches. A separate stair circuit would mean dragging a second hot into an already-full 2-gang.
  • No monitoring conflict: each 3-way has its own Shelly 1PM Mini Gen 4 at its own load, so the bay Shelly still meters only bay lights and the stair Shelly only the stair, despite the shared branch.
• Trade-offs accepted: a tripped bay-light breaker darkens the stair too. Acceptable given how rarely a lighting-only LED circuit faults and the always-works hardwired 3-way fallback — not worth a dedicated breaker plus the extra feed and box fill. (Belt-and-suspenders option of a dedicated small main-panel stair circuit was considered and declined.)
• Future-apartment caveat: NEC 210.25(B) governs unit vs. common/house circuits after a conversion; a shared/landlord stair belongs on a house (garage main) circuit — exactly this. If the loft becomes an apartment with its own exterior door + steps to the current landing, the tenant-facing stair-light switch relocates into that new entry space. To preserve that option, during pre-drywall run ¾” smurf tube (ENT) from the stairwell-bottom 2-gang up to the landing and pull a 12/3 through it (leave a pull string + service loops; accessible blank-covered boxes both ends per NEC 314.29). Why this and not bare cable in the wall: the conduit keeps it re-pullable if the apartment layout differs from today’s guess, and 12/3 — not the 12/2 spool — covers a future 3-way and/or a smart switch that needs a neutral per NEC 404.2(C); a buried 12/2 would commit to one guessed config that can’t be revised once drywalled (and dead-ending cable in a wall isn’t allowed anyway, so it saves no boxes). Re-feeding/relocation happens at the permitted, inspected conversion.
• Options not chosen: stair light on the future loft subpanel (“upstairs lights”) — rejected because it ties egress lighting to the apartment’s own power, backwards for safety; dedicated stair branch on the main panel — rejected as unnecessary (extra feed + box fill for negligible benefit).
• Related: Switch Topology & Smart Relay Placement, Physical Switch Locations, 2026-04-20 — Interior Lighting Switch Topology (parent topology decision)

2026-06-07 — Pressure Washer Unit: Giraffe Grandfalls Plus (Recommended, Not Yet Purchased)

• Area: design/interior/cleaning
• Decision: Recommend the Giraffe Tools Grandfalls Plus (~$379.99) as the starting wall-mounted pressure washer, applying Buy Cheap, Upgrade When Proven. Not yet purchased — buy near install time.
• Status: ✅ Recommended; ⏳ purchase deferred to install
• Rationale: It’s the only true all-in-one (washer + 100 ft retractable replaceable hose + wall mount in one ~$380 box) — cheaper than a bare detailing unit plus the separate reel and shelf it would need, and its 2.2 GPM is the best flow in the field for the primary job (vehicle washing). Cold feed is correct for vehicle finishes, so its 104°F inlet limit costs nothing on day one. 4.8★, 2-yr warranty, replaceable hose = low-regret first buy that validates real usage before spending more.
• Trade-offs accepted: brush (not induction) motor and 90–93 dB noise; 104°F inlet can’t use the combi hot stub without tempering.
• Upgrade triggers (documented): brush-motor wear or noise → Giraffe Grandfalls Pro ($629.99,induction,78–80dB);genuineneedforhotdegreasingviathestub\to \ast \ast Active2.0\ast \ast (140°F)or\ast \ast ARBlueCleanAR630HW\ast \ast (180°F,$1,345). Log upgrades in the philosophy doc.
• Options not chosen: Active 2.0 / VE52 (modular detailing rigs — better pumps + 140°F inlet, but unit + reel + shelf costs more and adds parts); AR Blue Clean AR630HW (true 180°F hot, but $1,345+reel=upgradetier);\ast \ast CamsprayDeluxewallmount\ast \ast (industrial,$1,500–2,500+, often 230V — overkill); Giraffe G20 (non-replaceable hose — fails the longevity test).
• Related: Product Candidates & Selection; Tool Purchasing Philosophy

2026-06-07 — Wall-Mounted Pressure Washer: Bay 3 Wall, Cold Feed + Capped Hot Stub

• Area: design/interior/cleaning
• Decision: Add a permanent wall-mounted pressure washer to the main floor, mounted on the mechanical-room / Bay 3 wall, fed by the cold hard-water line as primary with a capped hot stub off the boiler DHW for a possible future hot feed. A long (~50 ft) high-pressure hose reel decouples mount location from wash location — it reaches the Bay 1–2 floor drain for indoor washing and out the door to the driveway. Rough in the supporting blocking, dedicated GFCI circuit, capped water stubs, and a backflow preventer during the framing/pre-drywall window so the option is preserved this build season. The specific unit is not selected yet.
• Status: ✅ Decided (placement, feed strategy, pre-drywall hooks); ⏳ unit selection deferred; ⏳ drain-discharge verification open
• Rationale:
  • The garage is unusually well-suited to a permanent unit. The floor drain in Bays 1–2 is already graded for runoff, a hard-water line + combi-boiler hot water arrive Spring 2026, and the heated space means minimal freeze risk. Framing is the current phase, so blocking/circuit/stubs are cheap now and expensive to retrofit after drywall — the same “buy infrastructure during construction, decide the appliance later” pattern used for the compressor’s 240V slab circuit.
  • Mount location ≠ wash location. The short hose is the supply side; the long reel is what reaches the work. Mounting on the Bay 3 / mechanical-room wall keeps the utility runs short (closest to boiler + water entry) while a 50 ft reel still covers the Bay 1–2 drain and the driveway.
  • You wash in Bays 1–2, never Bay 3. Bay 3 is the level lift bay with no floor drain; the drain is in Bays 1–2. So indoor washing always happens over the Bay 1–2 drain regardless of mount location — which keeps the lift free for the Corvette restoration and resolves the winter “do I have to give up the lift to wash?” worry.
  • Cold primary, hot optional. Cold is standard/preferred for vehicle finishes (hot strips wax, causes spotting); hot’s real value is degreasing/parts/shop cleanup. Stubbing hot now (capped) keeps that option cheap without committing.
• Trade-offs accepted:
  • Wall-mount means electric (~1.5–2 GPM / ~2000 PSI) vs. a gas portable’s higher output (2.5–4 GPM / 3000+ PSI). Acceptable: electric is the better choice indoors; a cheap gas portable can still be bought separately for heavy outdoor jobs.
  • Indoor washing puts humid overspray on a finished, equipment-filled shop — requires splash-zone planning (water-resistant wall finish, GFCI, protect electronics).
• Implications:
  • Adds framing-phase pre-roughs to Critical Pre-Insulation Requirements and To-Do: blocking at the mount, capped cold + hot water stubs, dedicated GFCI circuit + box, backflow preventer.
  • New design note: Wall-Mounted Pressure Washer. Cross-referenced from Electrical Planning, Utilities Planning - Air, Vacuum, and Fume Extraction, and Interior Aesthetics & Finish Plan.
  • Open item (must verify before indoor chemical washing): the floor drain discharges to a French drain / daylight, not a sanitary sewer with an interceptor. Detergent/oil/brake-dust runoff there is a likely environmental/code concern (rural Clare County, well/septic proximity). Tracked as a To-Do; plain-water rinsing indoors is the fallback until confirmed.
  • Inlet-temp caveat: most cold-water electric units cap inlet at ~104°F vs. ~120°F combi DHW — temper or pick a warm-inlet-rated unit before plumbing hot live.
• Options not chosen:
  • Bay 1 wall, cold only (the original instinct) — simplest plumbing, but farthest from the boiler (long, slow first-draw hot run) and forgoes the hot option. Rejected: the Bay 3 mount gets a short hot run and still reaches Bay 1 via the reel, so Bay 1 gives up the hot option for no placement benefit.
  • Bay 3 wall, hot feed live now — hot from day one, but adds a live hot line + the inlet-temp/tempering problem before the unit is even chosen, and hot is rarely needed for vehicle washing. Rejected in favor of a capped stub: keeps the option open at near-zero cost without committing.
• Related: Wall-Mounted Pressure Washer; Critical Pre-Insulation Requirements; Electrical Planning; 2026-05-16 — Dual Hard + Soft Water Lines to Garage

2026-06-06 — Floor Finish: Densifier over Coating

• Area: design/interior/floor-finish
• Decision: Finish the full 960 sq ft main-level slab with a DIY lithium-silicate densifier (Prosoco LS / Ashford Formula / Lythic Day1) instead of hiring a contractor to apply a polyaspartic/polyurea flake coating. The coating plan — and the entire equipment-protection apparatus built around it — is dropped.
• Status: ✅ Decided
• Rationale:
  • The coating was the sole cause of a large complexity web. Everything in the vault’s floor-protection docs — ~$230–430inUHMW-PEpads+casterswaps,$230–740 in hot-work barriers, the move-in caster-swap choreography, annual + 5-year pad-inspection rituals, radiant-heat shutdown/warm-up coordination — existed only because polyaspartic is a soft polymer film that scratches, chips, burns, stains-under-chips, and chemically bonds to anything parked on it. Skipping the coating collapses that whole dependency tree.
  • A densifier solves the actual problem. The real practical issue with the slab is dust (raw concrete continuously sheds fine alkaline dust) and oil absorption. Lithium silicate reacts with free lime to harden the surface and tighten the pores — killing most dust and slowing absorption — for ~$50–150 DIY (spray-and-broom, ~200–300 sq ft/gal). It’s inorganic, so nothing scratches/chips/burns/bonds: zero protection burden, hot-work safe, grippy under oil, no radiant-heat coordination, no moisture-failure risk.
  • “Do nothing / raw concrete” was rejected — raw unsealed concrete is the worst option (dusts forever, absorbs every oil drip permanently). The densifier is so cheap and easy there’s no reason to leave it bare.
• Trade-offs accepted:
  • No showroom flake aesthetic and no 30–40% light bounce off the floor.
  • Stain resistance is “better than raw concrete,” not truly wipe-clean — oil/brake fluid should be wiped promptly.
• Implications:
  • Removes the planned April–May 2026 coating-install milestone and the **$4,500–6,500\ast \ast contractorlineitem;replacesitwitha$50–150 DIY densifier task after interior trades.
  • Obsoletes the equipment-protection burden: Jack Stand Selection (no sandwich pads), Floor Jack Selection (no PU caster upgrade), Shop Equipment Floor Protection (no UHMW-PE cups), and the former Floor Coating Protection Quick Reference (rewritten as Densified Concrete Floor Care).
  • New DIY reference: Floor Densifier Application. Anchor doc updated: Aesthetics plan §1.1.
  • Floor Coating Contractors kept as a superseded/contingency record, not deleted.
• Future coating — option, not a plan:
  • A densifier does not foreclose a future coating. Any reputable installer diamond-grinds or shot-blasts the slab to a bare profile (CSP 2–3) as standard prep, which removes the densified surface layer. So the option stays genuinely open, and deferring an optional, reversible expense is financially sound (keep the money, decide with real usage knowledge, maybe never spend it).
  • But the reversibility is time-boxed, not a free 10-year option. The cheap/clean window to coat is while the slab is empty / before the 2-post lift is anchored and before heavy automotive use. Coating at ~year 10 is the worst path: (1) you’d have to evacuate all equipment and coat around a bolted-down lift; (2) a decade of oil/brake-fluid drips contaminates concrete, which is the #1 cause of coating delamination and forces costly remediation; (3) price inflation ($4.5–6.5ktoday\to plausibly$6–9k+). The genuinely worst sequence is “densify, use hard for 10 years, then coat.”
  • Decision rule for future-me: if a coating is ever wanted, commit to it before the lift goes in and before the slab is oil-stained — otherwise treat densified-bare as the permanent finish.
• Options not chosen:
  • Full polyaspartic coating (status quo) — best aesthetics and wipe-clean stain resistance, but $4.5–6.5k + the full lifetime protection burden. Rejected: the cost and complexity outweigh aesthetic/convenience gains for a working shop.
  • Hybrid (coat Bays 1–2 + walkways, densify Bay 3) — the previously-documented “best of both” that pro shops use. Considered and rejected in favor of full densify: simpler (one material, no two-zone masking or transition-joint planning), cheaper, and the aesthetic upside of coating only two bays didn’t justify keeping any of the protection burden.
• Related: Interior Aesthetics & Finish Plan; Floor Densifier Application; Densified Concrete Floor Care; Floor Coating Contractors

2026-06-05 — Vehicle Bay Lighting: Longitudinal Per-Bay Runs (3×5)

• Area: design/lighting/vehicle-bays
• Decision: Change Zone 1 vehicle-bay lighting from 3 rows × 3 fixtures running across the bays to 3 runs × 5 fixtures running front-to-back, one centered per bay (the “along the bay” layout). Each run is rear-fed: a single ceiling outlet on the north (rear) wall at the bay centerline feeds one continuous 5-fixture chain running front-to-back toward the doors (one cord per bay). Zone 1 rises 9 → 15 fixtures.
• Status: ✅ Decided (layout, orientation, rear feed); ⏳ exact fixture positions to verify on site
• Rationale:
  • Light should follow the length of the car. A run down each bay lights the vehicle hood-to-trunk and both sides evenly; cross-bay strips lay light in bands with dark gaps and put the most-worked zones in shadow. A 20’ line source fore-and-aft also fills the shadow you cast when leaning over the engine or a fender.
  • The fixture system’s limit matches the geometry — in one direction only. Barrina links a max of 6 fixtures = 24’. That’s the bay depth, not the 40’ width: a cross-bay chain can’t span three bays (would need ~10, past the 6 limit) and leaves a bay dark. Front-to-back, one chain = one bay.
  • 5, not 6: six fixtures = 24’ of solid strip, which overruns the ~23’ finished interior depth (24’ less wall framing + drywall). Five (20’) drops in with ~1.5’ clearance each end.
  • Door-wall orientation corrected: the three overhead doors are on the 40’ wall, so 40’ = width and 24’ = depth. (Earlier drafts + the layout diagram had this flipped.)
  • Mounting: attic-truss bottom chords run front-to-back (the 24’ span), so each run screws straight up under a single chord — one dead-straight line, no crossing members.
  • Rear feed gives a clean north/south split. All lighting outlets sit on the north (rear) wall; the door openers and front-wall outlets stay on the south ceiling-door circuit. This avoids the door-lift-track zone entirely (no outlet or fixture competing with the open door panels/tracks at the front) and keeps the two systems physically and electrically separated.
  • One chain, one cord per bay — the simplest wiring; a single 5-fixture chain runs from the rear outlet toward the doors. The ~1–2’ dark margin lands at the very front (the door-panel zone, which can’t be usefully lit with the door open anyway); cars park nose-in so the engine end stays under the forward fixtures.
• Implications:
  • Zone 1 9 → 15 fixtures; total garage lighting ~24 (15 bays + 6 workbench + 3 lift). The Barrina 20-pack ordered 2026-06-01 covers all 15 bay fixtures + 5 toward Zones 2/3 → ~4 more to purchase.
  • Bay-lighting circuit load rises 9 → 15 fixtures = 5A on the dedicated 20A — still well under capacity.
  • Box positions move to the rear (north) wall at the bay centerlines, on one NM-B run along that wall. Box type unchanged (4” square + mud ring per 2026-06-03); the Zone-1 Shelly lands at one of the rear boxes.
  • Updates Interior Lighting Plan Zone 1 + Interior Lighting Layout Diagram (canonical figure) and circuit-load figures.
• Supersedes / refines:
  • The 2026-05-24 “lighting duplex at the bay depth-midpoint, start with 3 and double to 6 later” — superseded: outlets move to the rear wall, and the full per-bay run (5 fixtures) is installed from the start in one chain. Five (not six) because 24’ overruns the ~23’ interior depth.
• Options not chosen:
  • Across-the-bays (cross) strips — rejected: a 6-link chain can’t span the 40’ width, leaves a bay dark, and fights the truss direction. This is what prompted the rethink.
  • 3 × 6 (18 in the bays) — rejected: 24’ overruns the ~23’ interior depth; would force split chains on two outlets per bay.
  • Center-fed duplex (two opposing chains, 3 fwd + 2 rear) — considered, to preserve the 2026-05-24 mid-depth box position and balance coverage; rejected in favor of the rear feed for simpler wiring (one cord/bay) and the clean north/south circuit separation.
  • Front (south) end-feed — rejected: the outlet and front fixtures would sit in the door-panel/track zone.
• Related: Interior Lighting Plan; 2026-05-24 depth-midpoint decision; bay-lighting circuit; draft drawings printable/lighting-layout-options.html

2026-06-03 — Ceiling Duplex Boxes: 4” Octagon → 4” Square (Box Fill)

• Area: design/electrical/ceiling-outlets
• Decision: Replace the 4” octagon ceiling boxes with 4” square (1900) boxes, 2-1/8” deep + 1-gang 5/8”-raised mud rings for all 8 ceiling duplex outlets (3 GDO + 2 cord reels + 3 vehicle-bay lighting). Keep one octagon for the stairwell light fixture, where an octagon is the correct box. Return the surplus octagons.
• Status: ✅ Decided
• Rationale:
  • Box fill is the deciding factor. A 1-1/2” octagon = 15.5 in³. The ceiling duplex outlets are pass-through on the daisy-chained run, so a typical box carries 12/2 in + out (4× #12 @ 2.25 = 9.0 in³) + grounds (2.25) + duplex device (4.5) = 15.75 in³ — over the limit per NEC 314.16(B). External snap-in NM connectors mean no clamp allowance to recover the deficit. A 4” square box at 2-1/8” deep (30.3 in³) clears this with wide margin and accommodates the bay-lighting Shelly position.
  • The bare-box hole mismatch was a red herring. Octagons use 8-32 fixture-strap spacing; a duplex always mounts to a cover/mud ring (6-32), which the BOM already planned for. The receptacle was never going to bolt to the bare octagon — but that’s by design, not the reason to switch.
  • 5/8” mud-ring raise matches the 5/8” Type X garage-ceiling drywall, setting the device flush with the finished cover plate.
• Implications:
  • Ordered 2026-06-03: 9× Southwire 52171-FS-UPC 4” square boxes (HD order WK27532942, $5.99ea—8needed+1spare)and\ast \ast 8\times OHLECTRIC5/8"mudrings\ast \ast (Amazonorder114-1258773,$4.75 ea / $18.99per4-pack).Netcostofthechange\approx$80 after the ~$13 refund on 5 returned octagons.
  • Supersedes the 2026-05-24 plan to buy 3 more octagons and 8 octagon duplex covers — those are no longer needed.
  • One octagon (already on hand) is retained for the stairwell fixture; the other 5 of the 6 bought on 2026-05-24 are being returned (within the HD return window).
• Options not chosen:
  • Keep octagons + RACO 731 octagon duplex covers — rejected. Legal only at end-of-run boxes (single cable); most ceiling positions are pass-through and over-fill. Standardizing on 4” square avoids tracking which box is which.
  • 1-1/2” 4” square (21 in³) instead of 2-1/8” — would pass fill, but the deeper 2-1/8” box was chosen for headroom at the Shelly-equipped lighting box and negligible extra cost.
• Related: Special Boxes; door circuit; Electrical Materials Order; bench-check photo

2026-05-24 — Ceiling Outlet Layout: Lighting at Bay Depth-Midpoint + Cord Reels Trimmed to 2 (Between Bays)

• Area: design/electrical/ceiling-outlets
• Decision: Two related ceiling-outlet positioning decisions made during post-shopping-trip review:
  1. Vehicle-bay lighting duplexes positioned at each bay’s depth-midpoint (~12’ from the front in a 24’-deep bay), centered on the bay centerline. Preserves the rough-in option to double from 3 → 6 LED fixtures per bay later by plugging a second linkable chain into the unused half of the same duplex, with chains extending in opposite directions for even coverage.
  2. Cord reels trimmed from 3 → 2, positioned between bays (Bay 1↔2 and Bay 2↔3 at depth-midpoint). Each between-bays reel swivels to serve both adjacent bays, and the typical 25-50’ reel cord covers either bay easily. Saves 1 octagon box, 1 device cover, and 1 cord-reel unit (~$50-100 hardware).
• Status: ✅ Decided
• Rationale:
  • Lighting centering is free flexibility. The current plan (1 duplex per bay → 1 linkable chain of 3 fixtures) installs identically regardless of where in the bay the duplex sits. Putting it at depth-midpoint instead of near the front costs nothing today and preserves a major future-upgrade path. If shop lighting ever feels dim, the upgrade is buy 3 more LEDs per bay (~$60ea\times 3bays=$180) and plug them into the unused receptacle — no drywall, no new boxes, no second Shelly.
  • Two chains can extend in opposite directions from one duplex. Each linkable LED fixture has its power cord on its first fixture only; the chain direction is determined by which way you orient that first fixture. So Receptacle A’s chain can run toward the front of the bay and Receptacle B’s chain can run toward the back — single duplex at center serves a doubled-coverage configuration with ~80% of bay depth lit evenly.
  • 3 cord reels never made geometric sense for 3 bays. With 3 bays there are only 2 between-bays positions. The original “3 reels between bays” assumed reels could land somewhere they couldn’t. The two valid layouts were (a) 2 between-bays serving 2 bays each, or (b) 3 over-bay-centerline reels with cords dropping onto parked vehicles. Option (a) wins on both ergonomics and material count.
  • Wall outlets are the safety net for future cord-reel needs. Perimeter receptacles every ≤6’ on all 4 walls + the planned front-wall drops between garage doors mean a wall-mounted cord reel can be added anywhere with no electrical re-rough. The 2 ceiling reels handle the most common case (center-of-bay power without crossing the floor); walls cover everything else.
• Implications:
  • Total ceiling octagons drop from 10 → 9 (3 GDO + 2 reel + 3 lighting + 1 stairwell). 6 already on hand from 2026-05-24 HD trip; 3 more needed.
  • Single-duplex device covers needed: 8 (3 GDO + 2 reel + 3 lighting; stairwell octagon gets a light fixture).
  • Cord reel hardware purchase reduced to 2 units (deferred — not yet purchased).
  • Vehicle-bay lighting circuit (1× 20A dedicated) is sized for 6 fixtures/bay × 3 bays = 18 fixtures × 40W = 720W / 6A — still under 30% of breaker capacity even at the doubled config. No circuit changes needed for the future upgrade.
• Options not chosen:
  • Keep 3 ceiling cord reels — rejected. Geometric awkwardness on a 3-bay layout; the third reel would either drop cords onto a parked vehicle or duplicate coverage already provided by the between-bays reels.
  • Add a 4th lighting duplex per bay for guaranteed even coverage — rejected as premature. The single-duplex doubling approach gives ~80% bay coverage; if a future paint-booth/inspection use case demands 100% even-grid coverage, a 4th duplex can be added without ceiling re-rough by tapping the vehicle-bay-lighting circuit at any of the 3 existing lighting boxes.
  • Position lighting duplex at front of bay — rejected. Optimizes today’s single-chain coverage at the cost of foreclosing the future-doubling. Same install cost either way.
• Related: door + bay-lighting circuits; Special Boxes; Electrical Materials Order

2026-05-18 — Electrical Wire & Box Labeling Convention

• Area: design/electrical/installation-standards
• Decision: Adopt a project-wide labeling convention for all DIY electrical work — every cable gets a self-laminated P-touch label with circuit number / direction / source-or-destination, every conductor with a non-default function gets a colored phase-tape band per a fixed color map, every box gets a sequential B-NN ID marked on framing during rough-in and on the cover plate after finishing, and the panel directory references box IDs rather than vague room descriptions. Full convention documented in Wire & Box Labeling Convention.
• Status: ✅ Decided
• Rationale:
  • DIY scope is large and spans years. ~30 boxes, 8+ general-purpose 20A circuits, multiple dedicated 240V circuits, MWBC runs, 3-way switching, smart-relay (Shelly) integration, future loft subpanel. Without a single convention applied from box #1, troubleshooting an outlet or adding a circuit five years from now will mean tracing cables back to the panel by hand.
  • Permanent knowledge-base philosophy. The vault is meant to be the troubleshooting reference decades from now (Project Philosophy). Labels are the physical-world half of that — they make the documented circuit schedule usable when standing at an open box with a meter.
  • Cost is negligible, retrofit cost is high. Self-laminated wire labels cost <$0.50/label; retrofitting labels onto already-installed and wirenutted cables means pulling devices, fanning out the bundle, and guessing direction from continuity tests. Labeling at rough-in adds maybe 30 seconds per cable.
  • Tools already owned. Brother P-touch (multi-line capable, model TBD) for self-laminated wire labels; DYMO LabelWriter 450 for flat-surface labels (panel directory, faceplates, cover plates, framing); 9-pack of ½” colored vinyl electrical tape (red/orange/black/white/brown/yellow/blue/grey/green) already purchased — covers every banding role with reserves for future expansion.
• Convention summary (full table in Electrical Planning):
  • Cable label format: circuit number + IN/OUT + source-or-destination, 1–2” from box entry, P-touch self-laminated tape
  • Box IDs: B-NN sequential, marked on framing in Sharpie + DYMO on cover plate, recorded in circuit schedule
  • Conductor banding: red=switched hot, blue=traveler, yellow=MWBC neutral, orange=UPS-protected, brown=Leg B / 240V L2, black-on-white=re-identified hot (NEC 200.7(C)), grey=low-voltage cable jacket; green and white held in reserve
  • MWBC: handle-tied 2-pole breaker per NEC 210.4(B), shared neutral grouped to its hots at panel per NEC 200.4(B), both hots and shared neutral banded yellow + jacket labeled MWBC
  • Panel directory: DYMO-printed, references box IDs, updated same-day on any energized circuit
  • Photo documentation: every box photographed before wire-nutting and before drywall, filed to pictures/YYYY-MM/ per standard naming
• Options not chosen:
  • No convention / ad-hoc labels — rejected. Default outcome without a documented standard. Costs nothing now, costs hours per future troubleshooting session.
  • Circuit number only (no direction/destination) — rejected. Half the time-saving value of labels is knowing which cable is upstream vs. downstream in a daisy chain; circuit-only labels still require continuity testing to trace.
  • DYMO paper labels on wire jackets — rejected. Paper adhesive does not bond reliably to PVC sheathing long-term; labels fall off or fade within years. Self-laminating tape is the only durable option for wire labels.
  • Color tape only (no written labels) — rejected. Insufficient information density. Color encodes function, written label encodes circuit identity — both are needed.
• Pre-rough-in dependencies:
  • Confirm P-touch model accepts TZe-SL cassettes; order TZe-SL231 (⅜”) and TZe-SL241 (½”) if not on hand
  • Start the circuit schedule (markdown table or spreadsheet) keyed by box ID before first box is wired
  • Print a one-page labeling cheat sheet on the DYMO and post it in the mechanical room near the panel
• Related: Wire & Box Labeling Convention; Critical Circuit UPS Strategy; Electrical Materials Order

2026-05-17 — Loft Bedroom Configuration Deferred to Phase 3

• Area: interior/layout/loft
• Decision: Defer the choice between open-loft / half-wall+barn-door / fully-walled bedroom configurations to Phase 3 (apartment conversion, 5+ years out). Phase 1 keeps the loft as a single open space optimized for office / theater / hangout use. Pre-rough during construction must keep all three configurations viable.
• Status: ⏸ Deferred (intentionally; pre-rough constraints below are decided and active)
• Options considered:
  • Open loft + movable divider (curtain / folding screen) — maximum flexibility, can’t legally list as 1BR, best for short-term / Airbnb / family
  • Half-wall (pony wall) + sliding barn door — visual and acoustic separation when desired, preserves light and perceived size, still not a legal 1BR, broadest tenant appeal
  • Full walled bedroom + hinged door + closet — legal 1BR listing (highest rent), highest privacy, locks layout, reduces perceived space
• Rationale:
  • Tenant profile drives configuration: long-term unrelated tenant strongly prefers walled bedroom; short-term, Airbnb, and family-use tenants do fine with open loft. Current tenant pool is uncertain across all four profiles.
  • HVAC concern about isolating a walled bedroom is resolved by the existing two-head mini-split design (HVAC Strategy — 9k bedroom head + 12k common head). Either configuration conditions the bedroom area independently with no comfort penalty. Walls are an aesthetic/rental decision, not an HVAC one.
  • 5+ year horizon means construction-time commitment to a specific layout has high optionality cost — defer the choice, preserve all options via pre-rough.
• Pre-rough required during construction (locks all three options as viable):
  • Egress window already purchased and delivered (three 39.5” × 59.5” Premium Designer NC DH fiberglass DH egress units — Hershberger contract / ABC Supply 580876-002); lock which one ends up in the future bedroom corner with installed sill ≤44” AFF
  • Bedroom 9k mini-split head wall, 2×6 horizontal blocking, lineset + condensate path pre-rough (already specified in Loft Bedroom Layout)
  • Kneewall closet opening location kept un-foamed for later cut-in
  • Resilient channel or RSIC clips + Rockwool Safe’n’Sound on garage ceiling above future bedroom + bathroom — pre-drywall only
  • W/D plumbing + electrical rough-in capped at bathroom wet wall
  • Smoke + CO detector wiring (14/3 between bedroom, common area, garage heat detector)
  • Low-voltage smurf tubes (Cat6 / speaker / TV)
• Source: Loft Apartment Conversion Plan; conversation 2026-05-17

2026-05-16 — Dual Hard + Soft Water Lines to Garage

• Area: design/plumbing/utilities
• Decision: Run two 3/4” underground-rated PEX lines through the existing 2” water sleeve in Trench 2 — one hard (tapped upstream of the planned house water softener) and one soft (downstream of the softener). Both lines get individual labeled shutoffs at the house and at the garage mechanical room. This is contingent on a house water softener actually being installed (currently under consideration in the asset-maintenance project); if no softener is ever installed, both lines simply carry the same unsoftened water and the future-proofing is preserved at trivial cost.
• Status: ✅ Decided
• Rationale:
  • The 2” conduit was sized for this. A 2” PVC sleeve easily accommodates two 3/4” PEX-A lines (OD ~0.875” each, flexible, nest without binding). The original Utilities & Conduits.md note already anticipated “both supply and potential return” — using that capacity for hard + soft is a more useful split than supply + return for a building of this size.
  • Cost delta is negligible. One extra spool of 3/4” PEX (~$50–100 / 100 ft), one extra tee at the house, two extra ball-valve shutoffs, one extra bulkhead penetration. Compared to re-digging Trench 2 (frost-depth excavation, 42”+ deep, beneath driveway path), the retrofit cost is 50–100× higher.
  • Use-case map is asymmetric. Loft apartment fixtures (bath, kitchen, laundry), boiler DHW cold inlet, and hydronic fill water all want soft for fixture/exchanger longevity (already flagged in Hard Water Mitigation and Boiler Installation Components). Exterior hose bibs (car wash, plants, irrigation), shop sink, and mechanical-room utility taps all want hard so the softener’s salt-regen capacity isn’t burned on tasks that don’t benefit from softened water.
  • Alternative considered: single line + small softener in the garage mechanical room. Rejected — duplicates softener cost, adds a second salt-refill chore, and consumes mechanical-closet floorspace already tight for boiler, manifold, indirect tank (potentially), and utility hookups.
  • Alternative considered: single soft line only (softener serves both buildings). Rejected for hose-bib use — softened water on plants/lawn is wasteful and slightly worse for soil chemistry over time; salt-regen volume scales with use.
• Implementation:
  • At house side: Tee the hard line off the cold-water main upstream of the softener; tee the soft line off downstream of the softener. Each gets its own labeled ball-valve shutoff for individual isolation and winterization.
  • Through trench/conduit: Pull both PEX lines simultaneously through the existing 2” water sleeve using fish tape (lower friction than pulling sequentially). Direct-bury both in Trench 2 alongside the gas/sewer/low-voltage lines, both below 42” frost line per MI Plumbing Code §305.4.
  • Distinguish the two: Use different jacket colors if available at supply, otherwise wrap one line with colored tape end-to-end and verify polarity with continuity check before backfilling. Label both ends “HARD” and “SOFT” on permanent tags.
  • At garage side: Each line gets its own labeled ball-valve shutoff at the mechanical room where it emerges from the floor conduit, then branches per the use-case map (see Water Line (PEX)).
  • Insulation: First 10 ft from each building, both lines get rigid foam insulation above (already standard per the existing trench profile).
• Dependencies:
  • House water softener installation decision — the dual-line plan is robust either way (works fine if no softener is ever installed; both lines just carry hard water), but the strongest cost-justification assumes a softener will exist.
  • Trench 2 not yet dug as of 2026-05-16 — this decision must be locked before Trench 2 excavation/utility pull is scheduled.
• Related: Water Line (PEX); Hard Water Mitigation; Boiler Installation Components

2026-05-15 — Loft Door-Closed Comfort Approach

• Area: design/HVAC/loft
• Decision: Use the 12k common-area mini-split zone as the loft’s air-pathway hub. Every closed-door room except the bedroom borrows conditioned air from the common zone through a supply transfer fan (high) + passive return grille (low) pair on the shared common-area wall — the same Suncourt TW108 + Leviton DT160 pattern already specced for the bathroom, replicated per room. The bedroom keeps its dedicated 9k head and is the only closed-door room that needs no transfer hardware (a 1.5” door undercut handles return airflow when the door is closed). Door-undercut-only is reserved for non-comfort-critical small rooms (pantry, hallway closet); passive transom-style high/low grille pairs (no fan) are an option for moderate-load rooms (walk-in closet).
• Status: ✅ Decided
• Rationale:
  • 2-zone condenser is locked. The May 14 decision committed to a 21k 2-zone (9k+12k) MrCool DIY 5th Gen for the loft; that condenser cannot accept a third indoor head. Adding a third head later would require a second condenser, not a chassis swap. Treating the common-area zone as an air-pathway hub is the only DIY-friendly way to comfort-condition more than two closed-door rooms on one condenser.
  • Pattern is already proven in this build. The bathroom uses exactly this approach with Suncourt TW108 + Leviton DT160 + 10x6 grille (~$145 per room). Replicating it for any future room means the user is using a familiar, already-purchased component set — no new system to learn.
  • Layout is still flexible. The 560 sq ft loft has no firm room plan yet; an apartment conversion is 5+ years out and uncertain. The hub-and-spoke approach scales with whatever future subdivision happens — every plausible shared-common-area wall gets a capped 8” sleeve and an electrical box during framing (~$15 per sleeve), then transfer fans get installed only as rooms emerge.
  • Closes door-pressurization failure mode. Without a return path (door undercut + return grille), a mini-split head pressurizes the closed room and stops moving conditioned air into it. The transfer-fan + return-grille pair ensures every closed room has both supply and return.
  • Avoids the slim-duct trap. A slim-duct mini-split serving multiple rooms is a real engineering solution but requires a brand that doesn’t exist in the DIY tier; MrCool doesn’t offer a DIY slim-duct. The hub-and-spoke transfer-fan approach gets ~90% of the comfort benefit at <10% of the equipment + DIY complexity.
• Options not chosen:
  • Per-room mini-split heads (3-zone or 4-zone condenser) — rejected. Returns to the multi-zone derating concern and forfeits the cold-climate rating gain and tax-credit timing benefits captured in the May 14 two-system decision. Also doesn’t fit the build’s “install minimally, rough generously, expand as rooms emerge” pacing.
  • Slim-duct mini-split (Mitsubishi SUZ + SEZ heads, etc.) — rejected. No DIY-friendly slim-duct option; requires licensed install, voids the DIY savings and warranty strategy.
  • Jumper ducts (ceiling crossover ducts above doors) — considered but not selected. Better acoustics than transfer fans but requires more ceiling depth, more complex routing, and doesn’t offer the on-demand control that the bathroom transfer fan already provides. Reserved as a backup if a future room needs continuous airflow without a fan.
  • Transom vents (passive louvers above doors) — considered for small rooms. Simpler than transfer fans but limited CFM (~30-50 vs. 80 CFM for the TW108). Acceptable for low-load rooms (walk-in closet) but insufficient for an occupied office or sleeping space.
  • Door undercut alone — considered. Works for thermal mixing only when the head is actively running; insufficient for a closed bedroom where the head’s setpoint may be different from the common area and the door blocks lateral airflow. Used as the bedroom’s return path (1.5”) because the bedroom has its own head; reserved as the only conditioning for non-comfort-critical small rooms.
• Implementation:
  • Rough generously now. Install 3-4 capped 8” galvanized wall sleeves at ceiling height on every plausible future shared-common-area wall, plus paired return-grille framed openings (10x6) at floor height, plus single-gang electrical boxes for each fan and a switch-leg back to a wall box for a future Leviton DT160 timer. Wire to loft general-lighting circuit (15A; <0.5A per fan).
  • Install minimally now. Only the bathroom transfer fan kit ($145) gets installed in the first-pass loft finish — it is the only currently-certain closed-door room.
  • Install incrementally. As future rooms get framed in (office, 2nd bedroom, server closet), pull a Suncourt TW108 + Leviton DT160 + 10x6 grille kit off the shelf and install in the pre-roughed location. Each future room incurs only the ~$145 component cost, not the wall-cutting + drywall-patching cost.
  • Label every capped stub at both ends per existing project standard.
  • Bedroom head placement: interior wall opposite the egress window (not shared with common area, not shared with bathroom), 6-8” below ceiling, centered horizontally, ≥3 ft from door swing. Pre-install 2x6 horizontal blocking at head height.
• Related: Loft Door-Closed Comfort; Loft Bathroom Conditioning; 2026-05-15 — Loft ERV Pre-Rough Now, Install Later; 2026-05-15 — Loft Interior Door Specifications; 2026-05-14 — Mini-Split Topology: Two Separate Systems (Single-Zone Garage + 2-Zone Loft)

2026-05-15 — Loft ERV Pre-Rough Now, Install Later

• Area: design/HVAC/loft/ventilation
• Decision: Pre-rough the energy recovery ventilator (ERV) duct chase, exterior wall penetrations, condensate stub, and 120V outlet now during framing, sized for a Panasonic Intelli-Balance 100. Defer the actual ERV unit purchase and install until the loft is converted to a dwelling or hosts its first non-owner occupant. Pre-rough materials: ~$200;deferredunitcost:$1,100-1,300.
• Status: ✅ Decided
• Rationale:
  • Envelope is tight enough to need active fresh air. The loft will have flash-and-batt-insulated slopes, dense-pack cellulose, taped sheathing, sealed-combustion boiler, and mini-splits that move zero outside air. ASHRAE 62.2 baseline for 560 sq ft + 2 occupants is ~30 CFM continuous fresh air, which the envelope alone cannot reliably supply.
  • Closed-door bedroom CO2 is the specific failure case. Solid-core door + 1.5” undercut + mini-split head all keep the bedroom at temperature setpoint but do not bring in fresh air. Overnight CO2 in a closed bedroom regularly climbs past 1,200-1,800 ppm without active ventilation — measurably affects sleep quality and is exactly the use case a residential ERV is designed for.
  • Pre-rough cost is cheap insurance. ~$200 of duct chase + exterior caps + condensate stub + capped outlet during framing preserves the option indefinitely. Doing the same rough-in after drywall costs 5-10× and may require cutting through insulation.
  • Install can defer 5+ years. Current loft use is office/theater/hangout; closed-door sleeping is rare. No regulatory ventilation requirement applies until apartment conversion. The unit itself is the expensive part and depreciates whether installed or shelved — buying it now wastes a tax-credit year and 5+ years of warranty.
  • Solves the future-apartment problem too. When/if the apartment is built out, the ERV satisfies the code-compliant fresh-air requirement for a dwelling unit with no additional rough-in work needed.
• Options not chosen:
  • Install full ERV now in 2026 — rejected. Captures 25C credit in 2026 but commits ~$1,100-1,300 of equipment and starts the warranty clock for a use case that may not exist for 5+ years. Apartment conversion is uncertain.
  • Skip the ERV entirely (rely on envelope leakage + bathroom exhaust) — rejected. The envelope is intentionally tight; relying on uncontrolled leakage is the failure mode the build’s air-sealing strategy was designed to prevent. Bathroom exhaust alone is exhaust-only ventilation without heat recovery and is inadequate for closed-door bedroom CO2 management.
  • Exhaust-only ventilation with bedroom fresh-air inlet — rejected as a long-term plan but acceptable as the minimum viable alternative if the user later decides the ERV is too much system. The pre-rough this decision authorizes is forward-compatible with that downgrade.
  • HRV instead of ERV — considered. HRV recovers sensible heat only; ERV recovers both sensible and latent (humidity). In Michigan’s humid summers and dry winters, the ERV’s humidity recovery prevents over-drying in winter and over-humidifying in summer. Slight cost premium worth the latitude.
• Implementation:
  • Pre-rough scope (during framing, before insulation):
    • 2 exterior wall penetrations (intake + exhaust), opposite walls, located away from boiler flue and away from mini-split outdoor condenser intakes
    • 4” or 6” insulated flex chase routing from a central ceiling location to:
      • ≥3 supply terminations: bedroom, future office/2nd-bedroom location, second flex location
      • 2 return terminations: kitchen, bathroom
    • Condensate drain stub to mech wall
    • 120V circuit + outlet box at planned ERV unit location, capped
    • All chase endpoints capped, pull-strings installed, both ends labeled
  • Target unit (sizing only): Panasonic Intelli-Balance 100 — DIY-friendly, ECM, variable rate, no proprietary ducting, 50-100 CFM range fits 560 sq ft + ASHRAE 62.2 baseline.
  • Install triggers: (a) loft conversion to dwelling, (b) first non-owner occupant, (c) measured closed-door CO2 concern, (d) federal 25C credit deadline approaching with cash available.
  • Verify 25C eligibility at install time — ERV may be claimable under 25C as part of an HVAC bundle; verify at install year.
• Related: ERV Pre-Rough (Install Deferred); Insulation Strategy; 2026-05-15 — Loft Door-Closed Comfort Approach; Critical Pre-Insulation Requirements

2026-05-15 — Loft Interior Door Specifications

• Area: design/loft/doors
• Decision: Specify solid-core doors with planned undercuts for the bedroom (1.5”), bathroom (3/4”), and any future office/2nd bedroom (1”). Hollow-core doors acceptable for pantry/non-server closets with 1” undercut. Mechanical closet gets a louvered solid door for combustion-air pathway. The top-of-loft-stair fire-rated self-closing door (20-min rating, already specced separately) is unchanged.
• Status: ✅ Decided
• Rationale:
  • Sound isolation. Solid-core doors carry STC ~30+, hollow-core ~17. Bedroom and office (calls, sleep) benefit measurably from solid-core. Bathroom solid-core is standard residential privacy spec.
  • Return-airflow path when door is closed. Door undercuts pair with the per-room conditioning approach (mini-split head in bedroom; transfer fan in bathroom/office) by providing the return-air pathway when the door is closed. 1.5” bedroom undercut is generous because the bedroom has its own head and the room is the most likely to be closed for long periods.
  • No IRC requirement for solid-core on bedrooms; this is a comfort/acoustic choice consistent with the build’s “20-year reference” philosophy. The only code-mandated rated door on the loft level is the stair door.
  • Future-apartment compatibility. Solid-core bedroom/office doors are the residential-grade choice for a future tenant and match the apartment-ready intent.
• Implementation:
  • Door schedule (added to procurement when interior trim is specced):
    • Bedroom: solid core, 1.5” undercut, heavy-duty hinges
    • Bathroom: solid core, 3/4” undercut, standard hinges + privacy lockset
    • Future office / 2nd bedroom: solid core, 1” undercut
    • Pantry / non-server closet: hollow core OK, 1” undercut
    • Mechanical closet: louvered solid door (combustion-air pathway), no undercut
    • Loft-stair top: 20-min fire-rated, self-closing — already specced
  • Confirm rough opening heights during framing accommodate the planned undercut on each finished door (finished floor + door height + undercut + threshold/transition).
  • Hinge backing during framing: ensure double studs or solid backing at hinge locations for solid-core doors (heavier than hollow-core, more torque on hinges).
• Options not chosen:
  • Hollow-core throughout — rejected. Saves ~$50-100 per door but materially worse sound isolation in the rooms where it matters (bedroom, office). Owner is the primary occupant for 5+ years and will live with the difference.
  • Solid-core for every door — rejected as overkill. Pantry, closets, and mechanical-room doors gain nothing from solid-core acoustic isolation.
  • No undercut, rely on transfer fans alone — rejected. Door undercuts provide a passive return path when the transfer fan or mini-split head is off; designing without them creates a fail-deaf room when fans are deactivated.
• Related: Interior Door Specifications; Acoustic Strategy; 2026-05-15 — Loft Door-Closed Comfort Approach

2026-05-14 — Mini-Split Topology: Two Separate Systems (Single-Zone Garage + 2-Zone Loft)

• Area: design/HVAC/mini-split
• Decision: Replace the originally-planned single 36k 3-zone MrCool DIY 5th Gen with two independent mini-split systems: (1) a single-zone 18k BTU MrCool DIY 5th Gen Hyper-Heat serving the garage main floor, with its own outdoor condenser, and (2) a 2-zone 21k BTU MrCool DIY 5th Gen (9k bedroom + 12k common/kitchen) serving the loft, with its own outdoor condenser. Both outdoor units share a single concrete pad at the rear-wall location (pending Clare County setback confirmation). Brand remains MrCool subject to a Gwin Assisted DIY quote comparison covering both systems.
• Status: ✅ Decided
• Rationale:
  • Cold-climate rating gap closes. Single-zone 5th Gen Hyper-Heat is rated to -22°F vs. -13°F for the 36k multi-zone condenser. With the radiant slab as primary garage heat, the mini-split takes on the role of emergency backup heat if the gas combi boiler ever fails in deep cold — exactly the failure mode where a workshop most needs continued heat. The -22°F rating provides meaningful margin against Clare County’s design low (~-5°F to -10°F) and protects against the colder excursions that follow polar vortex events.
  • Failure isolation. One condenser dies, the other floor continues to operate. Important because the garage (workshop) and the loft (guest space) may be in active use by different occupants simultaneously, and because the recovery time for a single failed compressor on a 3-zone unit would knock out all three zones.
  • Real-world efficiency. HVAC pros (HVAC-Talk, r/HVAC, GarageJournal consensus) consistently flag that multi-zone systems run below their nameplate SEER in practice — short-cycling on small zone calls, refrigerant balance issues, and lower part-load efficiency. Two independent systems each run at their rated SEER and right-size their compressor cycling to their actual load. This was flagged as a “worth considering before ordering” item in HVAC Strategy and the analysis pulled the decision in this direction.
  • Tax-credit timing arbitrage. The federal 25C credit is **capped at $2,000pertaxyear\ast \ast ,notpersystem.Staggeringthetwoinstallsacrossthe2026/2027calendarboundarycaptures30$4,800-5,600, neither system alone hits the $2,000cap,sototalcombinedcreditlandsaround$1,440-1,680 vs. ~$1,616forasingle3-zoneinstallinonetaxyear.Netcreditbenefitismodest($0-160) but meaningful given that two-system equipment is roughly cost-neutral against the 3-zone bundle. Verify 25C remains in force for 2027 before committing to the staggered schedule.
  • DIY linesets are shorter and simpler. Each system’s lineset reaches only its own indoor head(s) over a shorter route from the shared rear-wall pad. Fewer fittings, fewer flares, fewer leak opportunities — flare failures are the dominant MrCool DIY failure mode in forum reports.
  • Independent control. Loft cooling can run overnight on a guest-comfort setpoint without compressor interactions affecting the garage, and vice versa. With a 3-zone, when only one small loft zone is calling, the larger 36k condenser must cycle anyway.
  • Cost is roughly neutral. Combined equipment ~$4,800-5,600(vs.$5,388 for the 3-zone bundle). Modest add of ~$200-350 net for additional pad/electrical materials offset by slightly larger tax credit. The decision is driven by operational benefits, not cost.
• Options not chosen:
  • Single 36k MrCool DIY 5th Gen 3-zone (9k+12k+18k) — rejected. -13°F multi-zone rating is adequate but not generous for emergency backup heat use. Single point of failure for all three zones. Real-world efficiency lower than two systems’ nameplate. Was the prior plan; analysis triggered the switch.
  • Window AC for garage floor + 2-zone MrCool for loft — rejected for a 20-year reference build. Saves ~$700-1,500 net but commits a window opening long-term, raises security/noise concerns in a workshop, and the only ≥18k BTU window units are loud 240V shakers (quiet inverter and “split window” heat pumps cap at ~10-14k BTU, under-sized for 960 sq ft). Pre-roughing the lineset path preserves an upgrade option but doesn’t recover the install duplication cost. Window AC option is preserved as a temporary construction-phase cooling path if needed during summer 2026 finish work — see Alternatives Considered.
  • PTAC sleeve + heat-pump PTAC for garage floor + 2-zone MrCool for loft — rejected. Through-wall PTAC avoids the window commitment and has reasonable durability (15-yr service life with chassis swap), but combined cost ($4,200-4,700)landswithin$300-900 of the chosen two-system mini-split topology, and SEER ~12 vs. 23 + 5-year shorter chassis life make the long-term math favor the single-zone Hyper-Heat at materially better operational performance.
  • Two single-zone systems for the loft (separate condensers for bedroom and common) — considered, not chosen. Would add ~$1,500-2,000 more equipment for very modest additional benefit; the loft’s two heads have correlated cooling/heating demand (same building envelope, same occupants), so multi-zone derating is small. Sticking with a single 2-zone condenser for the loft.
• Implementation:
  • Manual J first — confirm 18k garage / 9k+12k loft sizing post-insulation. The 18k may revise to 12k or 24k depending on actual cooling load; loft head sizes may shift between bedroom and common-area positions.
  • Get Gwin Assisted DIY quote for both systems before ordering; confirm Clare County, MI service coverage. Avoid splitting brands across the two systems — single-vendor service simplifies parts and labor support across a 20-year horizon. Gwin contact info kept in 30-Vendors & Contacts (and below, redacted from production).

_[Content redacted for privacy]_

• Pre-rough lineset paths for both systems during framing/before drywall. Each system has its own lineset path from the shared rear-wall pad to its indoor head(s).
• Plan two electrical circuits to the shared pad (separate disconnects, separate breakers). See Electrical Planning for branch-circuit allocation.
• Stagger install/commissioning across the 2026/2027 calendar boundary to capture separate 25C credits. Recommended sequence: loft 2-zone in service before 12/31/2026, garage single-zone in service in 2027 (verify 25C still in force before ordering #2).
• Shared concrete pad sized for both condensers at the center-back rear wall location (pending Clare County setback confirmation). Maintain manufacturer-specified clearance between units.
• Cold-climate role: garage system’s -22°F rating means it can serve as functional emergency heat if the radiant slab boiler fails. Document this in the boiler/heating-redundancy plan during install.
• Related: Current Decision: Two Separate MrCool DIY 5th Gen Systems; Cold Climate Performance; Mini-Split Outdoor Unit Installation Requirements; Mini-Split HVAC Order

2026-05-06 — Radiant + DHW Boiler Fuel: Natural Gas Combi (Sealed Combustion)

• Area: design/HVAC/radiant
• Decision: A single sealed-combustion (direct-vent) natural gas condensing combi boiler serves the main-floor radiant slab and the loft apartment’s domestic hot water (DHW). Atmospheric and power-vented designs are excluded because they are incompatible with the planned fume-extraction makeup air system. Candidate units: Navien NPE-A2 series, Rinnai i-Series, or Bosch Greenstar Combi (final selection after Manual J post-insulation).
• Status: ✅ Decided
• Rationale:
  • Operating cost. At Michigan May 2026 retail rates (~$1.20/thermgas,$0.18/kWh electric), gas delivers heat at ~$12/MMBTUvs.$53/MMBTU for electric resistance and ~$18/MMBTU for an air-to-water heat pump at COP 3.0. Over a 20-year reference build, the operating cost gap dominates equipment savings or premiums.
  • Sunk infrastructure favors gas. Natural gas service is already planned for the building; pulling a gas line is a sunk cost that strongly favors choosing gas appliances at this build.
  • Service availability. Gas combi boilers can be serviced by any plumber/HVAC tech in Clare County. Air-to-water heat pump service in rural mid-Michigan is materially harder to source.
  • Equipment cost. A gas combi is $2,000-3,000vs.$8,000-14,000 installed for an ATW heat pump.
  • Sealed-combustion install isolates the combustion air loop from interior pressure, eliminating backdraft risk when the fume extractor runs and pulls the building negative. Atmospheric and power-vented designs cannot make this guarantee in this envelope.
• Options not chosen:
  • Electric resistance boiler (Thermolec, Electro Industries EMB-S, Stiebel Eltron) — rejected. Operating cost is ~4× gas in Michigan; annual penalty of $1,200-2,000+ overwhelms any equipment savings. Also requires a substantial 240V circuit (60-100A, 14-24 kW) that would meaningfully consume panel/service capacity. Only sensible if gas is unavailable, the heating load is very small (vacation property), or the building is essentially off-grid with PV+battery.
  • Air-to-water heat pump (SpacePak Solstice Inverter, Chiltrix CX34, Arctic Heat Pumps, Nordic ATW) — deferred, not rejected outright. Operating cost is competitive (~1.5× gas at COP 3.0), eliminates combustion in the building, and is federal 25C tax credit eligible. But equipment cost is 3-5× a gas combi, simple payback against gas is decades, US service network is thin, the DIY pathway is weak (most require licensed refrigerant handling), and output derates at design-low temps so an electric resistance backup is typically still required.
  • Atmospheric / power-vented gas boiler — rejected. Both draw combustion air from the room, creating backdraft risk under the negative pressure caused by the planned fume extractor. Sealed-combustion is required for this envelope.
• Implementation:
  • Final boiler model selected after Manual J load calc post-insulation — sizing must match the actual radiant heat load + loft DHW peak demand, not generic estimates.
  • Sealed combustion required — two-pipe (dedicated outdoor combustion air intake + dedicated exhaust). Verify selected model supports two-pipe install before ordering.
  • Preserve future ATW swap path: document boiler-side hydronic connections (sizes, materials, valve locations, photos), leave a service loop of slack and union fittings on hot/cold/return so a future appliance swap doesn’t require cutting rigid copper, and record the supply/return temperature design point in the radiant docs (an ATW unit favors lower supply temps and may need a larger indirect DHW tank than a gas combi would).
  • Re-evaluation triggers for revisiting this decision: sustained natural gas price doubling, PV solar buildout with battery, or boiler end-of-life in 15-20 years.
• Related: Radiant Heating & DHW Boiler; Makeup Air for Fume Extraction; Decisions - Slab Sensor Conduit

2026-05-02 — Front Motion Sensor Architecture: Hardwired PIR via LV Cabinet, HA-Orchestrated

• Area: design/exterior/lighting/automation
• Decision: A RAB STL360 outdoor PIR mounts at the center of the front garage soffit (between garage doors 1 and 2) to drive the existing 3 soffit lights for camera-image-quality and deterrence purposes. The PIR’s signal routes back to the LV control cabinet (defined in Low-Voltage Control Cabinet) on a new Shelly Plus i4 input — not in parallel with the existing entry-door toggle switch. Home Assistant orchestrates the relay, combining the PIR with Reolink doorbell AI, Amcrest IP8M AI (via Blue Iris + CodeProject.AI), doorbell press events, and the toggle switch state into a single front-soffit control automation.
• Status: ✅ Decided
• Rationale:
  • Parallel SW-input wiring breaks under HA control. The existing Shelly 1PM Mini Gen 4 is in toggle mode so HA can override the relay state independently of the toggle switch’s resting position. In toggle mode, the relay reacts to edges on SW input. After HA has flipped the relay, the toggle switch’s resting position is effectively random — meaning a PIR wired in parallel produces ambiguous behavior (does nothing if toggle happens to be at hot, or fires a pair of edges that toggle/un-toggle the relay if toggle is at open). The wiring topology I’d initially proposed has hidden failure modes that only appear after HA has been used to control the lights — making it brittle in exactly the use case it’s meant to serve.
  • Centralized I/O cabinet is what we sized the LV cabinet for. The cabinet has reserve capacity precisely to accept future inputs like the front PIR. Adding a Shelly Plus i4 (~$25)anda22/4cablerun($10) is a modest cost for clean source attribution in HA.
  • HA gets full source attribution. The PIR is its own binary_sensor.front_pir entity, distinct from camera AI events, doorbell events, and toggle state. Automations and history tracking are clean.
  • Toggle switch behavior is unchanged. Local edge-toggle still works at the entry-door switch even if HA is down — that backstop doesn’t depend on the PIR architecture.
  • Camera AI is the more useful HA event source anyway. Reolink + Amcrest + CodeProject.AI provide filtered (person/vehicle) detection with bounding boxes and zones; the PIR is a “fast and dumb” trigger primarily for instant lights-on. The PIR’s HA event is logged but isn’t load-bearing for notifications.
• Options not chosen:
  • Parallel wiring of PIR with toggle on the existing Shelly SW input — rejected (ambiguous behavior under HA control of the relay).
  • Switch the Shelly to “switch” mode (SW state = relay state) — rejected (the switch position then re-asserts and overrides HA, defeating the HA-controllable design).
  • Switch to “detached” mode — rejected (loses local toggle backstop when HA is down).
  • Single multi-input Shelly (e.g., Plus 2PM) hosting both toggle + PIR at the entry-door switch box — considered and rejected. The goal of “HA monitors both contacts independently” is already met by the current plan: the existing Mini Gen 4 publishes its SW input state to HA as a binary_sensor entity automatically even in toggle mode, and the Plus i4 in the LV cabinet adds a second independent entity for the PIR. Two physical devices, three logical HA entities (toggle + PIR + relay) — logically equivalent to a single 2-input Shelly. The two-device topology is preferred because (a) it matches smurf-tube routing (PIR → LV cabinet, not PIR → entry-door switch box), (b) avoids replacing an already-installed Mini Gen 4 with a physically larger Plus 2PM that may not fit cleanly in the existing single-gang box, and (c) leaves 3 of 4 Plus i4 inputs reserved for future expansion anywhere the smurf tubes reach.
  • Wireless PIR (Hue Outdoor / Aqara P2 / Tuya Zigbee) — viable as a fallback, but inconsistent with the hardwired alarm-trade architecture used on rear/side and removes the local-fast-trigger reliability we get from STL360.
• Implementation:
  • Add 1× Shelly Plus i4 (~$25) to the LV cabinet — uses 1 of its 4 inputs for the front PIR; 3 inputs reserved for future expansion.
  • Pull 22/4 shielded alarm cable (~30 ft) from the new front-soffit-center junction box back to the LV cabinet via smurf tube during stage 3 rough-in.
  • STL360 mounts at front soffit center in a weatherproof 4×4 box; L/N from the existing soffit circuit; the PIR’s load output drives one conductor of the 22/4 to the cabinet’s Shelly Plus i4 input.
  • HA automation lives in homelab project (homelab/Garage/Garage Smart Automation Plan.md) — combines PIR + Reolink + Amcrest AI + doorbell + dashboard into the existing front-soffit relay control.
  • Front PIR cost: ~$183 added (STL360 + Shelly Plus i4 + cable + box + misc).
• Related: Lighting; Rear & Side Security Lighting; Electrical Planning; homelab project (camera/AI infrastructure)

2026-05-02 — Rear & Side Security Lighting: Curtain PIR + Full-Cutoff Wall Packs (No Cameras)

• Area: design/exterior/lighting/security
• Decision: The rear and side garage walls (each with 2 windows, both close to neighboring property — rear short distance to fence, side ~3’ to chain-link) will be protected by motion-activated full-cutoff LED wall packs triggered by outdoor curtain PIR sensors. No cameras on these walls (decided previously, neighbor field-of-view problem). Architecture: 2× Optex BXS-AM curtain PIRs (one center-mounted per wall, dual-curtain L/R = 4 zones total), 4× Lithonia OLWX1 13W full-cutoff wall packs (one above each window), 1× Shelly Pro 4PM exposing all 4 zones to Home Assistant as independent entities. New 15A circuit required.
• Status: ✅ Decided
• Rationale:
  • Curtain PIR geometry excludes neighbor yards. A standard wide-cone PIR puts half its detection lobe across the property line; a curtain plane parallel to the wall is geometrically incapable of seeing the neighbor side. Solves the false-trigger problem (neighbor’s pets) and the privacy problem (no surveillance of neighbor activity) at the same time.
  • Full-cutoff fixtures keep light on our side of the fence. The 3’ chain-link distance on the side wall is the binding constraint; chain-link is visually transparent so any sideways light dumps directly into the neighbor’s yard. Full cutoff = zero uplight, zero side-spill.
  • BXS-AM has independent L/R alarm outputs. 2× BXS-AM = 4 independently adjustable zones, matching 4 windows 1:1. Same per-zone HA visibility as 4× FTN-AM, at lower cost ($412vs.$460) and with fewer mounting/cable runs.
  • Single Shelly Pro 4PM consolidates 4 PIR inputs + 4 light relay outputs in one DIN-rail device. Each input becomes a binary_sensor in HA; each output a switch. Enables targeted per-zone lighting (more deterrent + less spill than blanket “all lights on”) and per-zone notifications.
  • Replaces the camera role for these walls with deterrent lighting + HA notifications. Cameras were rejected here because their field of view would be ~90% in the neighbor’s yard (privacy). The motion lights handle the “deter intruders” function the cameras would have played; per-zone HA notifications handle the “alert me to motion” function.
• Options not chosen:
  • Cameras — rejected previously (neighbor FOV problem; 90%+ of frame would be in the neighbor’s yard).
  • Wide-cone PIRs (RAB STL360 or similar) — rejected (would trigger constantly on neighbor pets/activity through fences; lights would be on most of the night for unrelated reasons).
  • Floodlights (HALO TGS or similar) — rejected for these walls (not full cutoff; would dump light over fence). Acceptable only on the front where there’s no close fence.
  • 4× FTN-AM single-curtain sensors — considered; functionally equivalent to 2× BXS-AM but $48 more, requires 4 mounting points + 4 cable runs vs. 2 + 2.
• Implementation:
  • Add new 15A 120V circuit to Electrical Planning for rear/side security lighting + sensor power. Total connected load <70W; the dedicated breaker exists for fault isolation, not amp capacity.
  • Centralized control architecture: Shelly Pro 4PM, Mean Well HDR-15-12 12V PSU, terminal blocks, and Class 2 fuse block all live in a dedicated low-voltage NEMA 1 control cabinet (~24-module) mounted adjacent to the main 200A panel (or at the smurf-tube convergence point). NEC 725.136(D)-compliant mixed-voltage cabinet with separate gland plates and slotted wireway duct for Class 1 / Class 2 separation. Sized to ~5× current needs to host future 12V/control devices (front motion controller, 24V PSU, ESPHome boards, energy monitoring) — establishes the building’s long-term smart-home / low-voltage hub.
  • Why not in the main breaker box: the 200A residential load center is listed as a branch-circuit distribution panel, not a control panel; adding non-distribution equipment violates its UL listing. Dedicated NEMA control cabinet is the right home and is purpose-listed for mixed-voltage use.
  • Pre-drywall rough-in (stage 3): mount LV cabinet backing board; short 14/2 home run from main panel to cabinet; from cabinet, 14/2 MC branches via smurf tubes to each of 4 wall pack locations; 22/4 shielded alarm cable from cabinet via smurf tubes to each of 2 BXS-AM center-mount locations.
  • Range settings: Rear wall — Setting 4 (~28 ft each side) covers the 40’ wall with ~4’ overlap. Side wall — Setting 3 (~20 ft each side) covers the 24’ wall with ~4’ overlap.
  • Front wall security lighting/motion is a separate decision with a different architecture (cameras + wide-angle PIR + already-installed soffit lights). To be addressed separately. Front motion sensor controller is expected to land in the same LV cabinet, which is sized to accept it.
• Related: Rear & Side Security Lighting; Lighting; Electrical Planning

2026-04-30 — Battery Tool Charging: Reuse Workbench Circuits, No Dedicated Charger Strip

• Area: design/electrical/tools
• Decision: Battery tool chargers (impacts, drills, lights) will use the existing 2× 20A workbench circuits. No separate “charger strip” circuit will be added. If charger demand ever outgrows the workbench circuits, new outlets can be pulled through the smurf-tubing infrastructure already planned for low-voltage and AV routing.
• Status: ✅ Decided
• Rationale:
  • Workbench circuits already anticipate charger load. Workbench runs (2× 20A) explicitly include “two outlets under-counter for fridge/chargers” plus 5–6 duplexes at 48” AFF.
  • No load problem to solve. Modern 18/20V rapid chargers draw ~1–2A each at 120V; even a 6-bay multi-platform station sits well under 12A on a single 20A circuit.
  • Smurf tubes are the future escape hatch. ENT pathways already in the plan (see Smurf Tube (ENT) — AV Signal Routing) make it straightforward to add outlets later without drywall demolition.
  • Saves a breaker slot for loads more likely to materialize.
• Options not chosen:
  • Dedicated 20A 120V charger-strip circuit at the workbench — rejected (no measurable nuisance-trip risk; the load doesn’t justify the home run, breaker, and panel slot).
• Implementation:
  • Per-platform outlet labeling at the workbench (e.g., “Milwaukee”, “DeWalt”) still applies — it manages pack inventory, not circuit segregation.
  • Battery fire safety per Fire Extinguisher Plan (AVD extinguishers at charging stations) is unchanged.
  • Update Air and Battery Tool Strategy charger-circuit recommendation to match.
• Related: Air and Battery Tool Strategy; Main Floor Outlet & Circuit Layout

2026-04-30 — Paint Booth Exhaust: Portable Window-Mounted, Not Fixed

• Area: design/ventilation/utilities
• Decision: There will be no permanently installed heavy-duty paint booth exhaust system. When automotive painting is needed (rare; Corvette restoration sessions, large car parts), a portable window-mounted exhaust fan will be installed temporarily in the paint-booth-area window for the duration of the work. The fixed fume extraction system (System A — 6” spiral steel trunk to inline blower) handles all routine fume work (3D printer vapors, laser cutter smoke, soldering, light airbrush) but is not sized or rated for automotive painting and will not be used for it.
• Status: ✅ Decided
• Rationale:
  • Frequency mismatch. Automotive painting happens in occasional multi-day sessions with multi-month gaps. A 2,000–4,000 CFM explosion-proof permanent installation is overbuilt for use this rare.
  • Window access already exists in the planned paint-booth area; portable window-mount exhaust is the standard low-cost solution for occasional automotive painting in a private shop.
  • Eliminates substantial pre-drywall complexity — no 12–24” metal trunk, no C1D1/C1D2 explosion-proof blower, no intake/exhaust filter housings, no dedicated high-CFM circuit.
  • Cost deferral, not cost rejection. Portable explosion-rated fans run ~$200–500;apermanentC1D1/C1D2systemis$3,000–8,000+. The decision can be revisited if paint volume ever increases materially.
• Options not chosen:
  • Permanent System B (12–24” duct, explosion-proof blower, dedicated high-CFM circuit) — rejected (overbuilt for occasional use, significant pre-drywall scope for low utilization).
  • Tie paint booth into System A — rejected and remains rejected (System A’s 6” trunk is sized for 3D-printer/laser/soldering CFM and cannot move enough air for paint; PVC and non-explosion-proof motors are not solvent-safe).
• Implementation:
  • Remove paint-booth ceiling outlet from Fume Extraction Circuits — no dedicated circuit will be installed.
  • Close TODO “Determine paint booth exhaust circuit requirements” in Electrical Planning planning checklist.
  • Reframe System B in Utilities Planning - Air, Vacuum, and Fume Extraction as portable, not fixed.
  • Portable fan, when used, runs from existing front-wall outlets.
  • Window adapter, fan model, and any explosion-proof or solvent-safe considerations to be researched at the time of first paint booth use — not pre-build.
• Related: Utilities Planning - Air, Vacuum, and Fume Extraction; Fume Extraction Strategy; Fume Extraction Circuits; DIY Paint Booth Build Guide (in the Garage-Projects repo)

2026-04-29 — Surface-Mount All Shop Utility Distribution (Air, Vacuum, Fume)

• Area: design/utilities/mechanical
• Decision: Compressed air piping, central vacuum piping, and fume extraction ducting (Systems A and B) are all surface-mounted on the drywall throughout the garage — both downstairs and upstairs. The previous hybrid approach (concealed vertical risers + exposed horizontals) is replaced with a single rule: surface-mount everywhere, with a deferred decision on whether the loft riser segments are left exposed or boxed into a chase if they prove visually intrusive.
• Status: ✅ Decided (planning; impacts pre-drywall blocking, electrical rough-in, and wall/floor penetration plan)
• Rationale:
  • Maintenance access for the life of the system. Every joint, drip leg, blast gate, blockage, and seal stays inspectable and serviceable. Concealed compressed air leaks rust pipes from the inside; concealed duct leaks contaminate wall cavities undetected.
  • Reconfigurability. Workstations, hose reels, drop stations, and tool inlets move over time; surface-mount lets them follow without drywall demolition.
  • No code requirement to conceal. Unlike electrical wiring (NEC) or certain gas piping (mechanical-damage protection), compressed air, dust collection, and ventilation duct have no concealment mandate.
  • Standard professional and DIY shop practice. Surface-mount is the default in commercial and well-equipped shops; concealment is rare even in customer-facing environments.
  • Faster, cheaper installation. Surface trunk runs are 4–8 hr labor vs. 20–40 hr for concealed routing through framing.
  • Industrial aesthetic appropriate for a workshop. Visible piping is acceptable in this space.
• Options not chosen:
  • Concealed throughout — rejected (permanent loss of access, settling/sag risk for compressed air, hidden duct leaks, drywall demolition required for any future change).
  • Hybrid concealed risers + exposed horizontals — rejected (adds pre-drywall complexity for marginal aesthetic gain; the original Utilities Planning recommendation is now superseded).
• Implementation impact (pre-drywall):
  • In-wall stubs and risers no longer needed for compressed air or central vacuum, except a possible boxed chase for the loft riser if owner prefers (deferred).
  • Wall blocking required at hose reel mounts, compressed air drop stations, retractable vacuum hose stations, floor sweep inlet, tool-station inlets, fume duct hangers, and along trunk-run strap intervals (~8.5 ft height for compressed air).
  • Wall and floor/ceiling penetration sleeves required at the mechanical-room exit, exterior wall (driveway air outlet, fume exhaust), and loft floor (per system).
  • Electrical rough-in unchanged but cross-listed: 30A 240V compressor circuit + disconnect, 20A 120V fume blower, 20A 120V workbench charger outlets, ceiling-mounted paint-booth fan outlets, optional sensor conduits.
• Related: Air and Battery Tool Strategy — surface-mount rationale; Utilities Planning - Air, Vacuum, and Fume Extraction; Workshop Dust Collection System; 240V dedicated loads; Ventilation Fume Extraction Circuits

2026-04-23 — Loft Attic Access: Knee Wall Doors Only, No Peak Hatch

• Area: insulation/loft
• Decision: Install one small insulated, weatherstripped access door in each knee wall (~22”×30”) to reach the triangular attic spaces behind them. No attic access hatch to the peak cavity — it will be dense-packed with blown cellulose and requires no access.
• Status: ✅ Decided (planning; framed during upper-level rough framing, door fit during insulation/drywall stage)
• Rationale:
  • Peak cavity doesn’t meet IRC R807.1 triggers. The flat-ceiling area at the ridge has <30” of vertical clear height above the drywall once the space is dense-packed with cellulose. Code requires attic access only when the space is ≥30 sq ft and ≥30” tall. A hatch would also break the continuous R-49 insulation blanket for no functional gain.
  • Knee wall attics DO meet R807.1. Each triangular space is ~5’ deep × 40’ long (≥200 sq ft per side) with clear height well over 30” at the outer truss webs. Code-required access, and practically necessary regardless.
  • Practical access matters for DIY maintenance. These spaces contain the rigid air barrier on the back of the knee walls (the critical wind-washing defense from Insulation Strategy Zone 3), plus any low-voltage runs, roof leak inspection points, and the eave baffles. A cheap door now is a non-issue; retrofitting access through finished drywall and fiberglass later is a significant job.
  • Thermal penalty is contained. A properly insulated and gasketed knee-wall door matches the R-13–R-26 of the wall assembly itself. No worse than the surrounding knee wall, unlike a ceiling attic hatch which would punch through the R-49 ceiling plane.
• Options not chosen:
  • Peak ceiling hatch (22”×30”, ceiling-mounted) — rejected (no clear height to access anyway, and it compromises the air barrier and ceiling insulation for no benefit).
  • No knee wall access at all (rely on tearing drywall if ever needed) — rejected (violates R807.1 for the triangular attic spaces and makes future troubleshooting of the most failure-prone insulation zone impractical).
  • Large attic hatches in knee walls (30”×48” or similar) — rejected (unnecessarily large; a 22”×30” opening meets code minimum and is easier to insulate and seal).
• Implementation:
  • Frame rough openings during upper-level wall framing so dimensional lumber is in place before drywall.
  • Build or buy an insulated door panel; back-insulate to match knee wall R-value; continuous weatherstripping around the jamb; latch/barrel-bolt to hold door firmly against the seal.
  • Locate openings in unobtrusive spots (end walls or behind future furniture zones) rather than prominent wall areas.
• Related: Zone 3 — Knee Walls; Zone 4 — Attic Floor Behind Knee Walls; Insulation Execution checklist

2026-04-23 — Vehicle Bay Lighting Split to Dedicated Circuit

• Area: electrical/lighting
• Decision: The nine overhead LED shop lights in the vehicle bays (3 ceiling outlets, 3 linkable groups of 3, 360W / 3A total) move to a dedicated 20A lighting circuit, split off from the previously shared ceiling/door run circuit. Ceiling/door run keeps garage door openers, front-wall outlets, cord reels, and camera/sensor outlets.
• Status: ✅ Decided (planning; to implement during DIY branch-circuit rough-in)
• Rationale:
  • Safety, not load. Load math on a shared circuit was fine (~3A lights + opener surge + front-wall duty well under 20A). The real concern is nuisance-trip risk: a jammed opener, a high-draw tool on a cord reel, or a GFCI fault on the front wall would cut overhead lights at the same instant — unacceptable while working under a vehicle raised on the 2-post lift.
  • Cost is marginal. One additional 20A breaker + one home run from the panel to the first ceiling box. Panel has ample space.
  • Side benefit: cleaner power monitoring. The Shelly 1PM Mini Gen 4 on the vehicle-bay walk-through 3-way reports only lighting load — no opener/tool noise on the monitored leg.
• Options not chosen:
  • Keep lights on the shared ceiling/door run (rejected — lift-bay safety outweighs minimizing breaker count).
  • Also split workbench and lift-bay task lighting onto dedicated circuits (not adopted now — both are task zones without overhead-hazard exposure, and sharing with their respective task-zone circuits keeps breaker count manageable; revisit only if nuisance trips occur in practice).
• Implementation:
  • Add 1× 20A breaker at garage main panel labelled “Vehicle Bay Lighting”.
  • Run 12/2 NM-B from panel → first ceiling outlet → remaining two ceiling outlets (one per linkable group of 3 fixtures).
  • Shelly 1PM Mini Gen 4 sits at the load (first fixture box) per the walk-through 3-way topology from 2026-04-20 — Interior Lighting Switch Topology.
  • Circuit count for the main floor is now 8 general-purpose 20A (was 7) plus the 2 dedicated mechanical-room circuits.
• Related: Main Floor Outlet & Circuit Layout; Interior Lighting (Main Garage Floor); Electrical Integration; Electrical Outlet Placement

2026-04-22 — Exterior Penetration Sealing at SLS-Installed Boxes

• Area: electrical/exterior
• Decision: Seal SLS’s exterior wall-penetrating boxes (NW-corner Cat6/spare junction boxes, 50A generator inlet, exterior GFCI, and any others) with a 3-sided caulk bead — top and both sides only, bottom edge left open for drainage. Use OSI Quad Max white (hybrid polymer, paintable). Do not retrofit a siding mounting block.
• Status: ✅ Decided (procedure documented; application pending — stage 7, after other exterior work)
• Rationale:
  • The interior spray foam SLS applied at the basement conduit penetrations handles the primary air seal at the conduit penetration. The exterior caulk’s narrow job is blocking wind-driven rain at the top/sides of each box.
  • Never four-side-seal a siding penetration — it creates a water trap. Vinyl/composite lap siding is a drained cladding, so any incidental moisture behind the box or siding must be able to escape at the bottom. Three-sided caulk is a practical retrofit drainage detail, not a substitute for a properly flashed WRB-integrated mounting block.
  • OSI Quad Max chosen for paintability, movement capability (vinyl expands/contracts seasonally), and reliable PVC-to-vinyl adhesion. Sashco Big Stretch is an acceptable alternative.
• Options not chosen:
  • Four-sided caulk bead — rejected (water trap risk; accelerates sheathing rot behind siding).
  • Retrofit siding mounting block (Arlington InBox, TAPCO) — rejected (requires pulling siding courses off the north wall for a few already-installed boxes; not warranted at this stage).
  • Pure silicone (GE Silicone II, etc.) — rejected (doesn’t bond reliably to vinyl siding, not paintable, fouls future touch-up).
  • Plain acrylic latex caulk — rejected (insufficient movement capability for seasonal vinyl-to-PVC expansion).
  • Leave as-is (rely solely on interior foam and the hidden wall drainage detail) — rejected (driving rain during storms can force water past the top gap and wet the wall behind).
• Implementation:
  • Trim protruding interior foam flush with utility knife after cure.
  • Wipe joint with denatured alcohol; apply a shallow bead at top and both sides; tool with wet finger; leave bottom open.
  • Do not pack the joint full or try to contact a hidden vapor retarder; the sealant only needs to bond to the exposed box and siding.
  • Walk perimeter first to catalog every SLS exterior penetration before starting.
• Related: Exterior Penetration Sealing (Owner Follow-Up); Electrical Materials Order; Cat6 box photo — gap visible; NW corner exterior boxes overview

2026-04-20 — Interior Lighting Switch Topology

• Area: electrical/lighting
• Decision: 3-way switching is reserved for walk-through paths only (entry door ↔ stairwell bottom for vehicle bay lights; bottom ↔ top of stairs for stairwell light). Workbench, lift bay, and loft main lights use single-pole switches at the point of use. Whole-floor “all on/off” is handled via Home Assistant scenes through Shelly smart relays, not ganged physical switches at the entry.
• Status: ✅ Decided
• Shelly model per zone:
  • Vehicle bays (3-way, walk-through): Shelly Plus 1PM at load
  • Workbench (single-pole): Shelly Plus 1 behind switch
  • Lift bay (single-pole): Shelly Plus 1 behind switch
  • Stairwell (3-way, hardwired): Shelly Plus 1PM at fixture (always-works physical 3-way for stair safety; Plus 1PM for power monitoring)
  • Loft main (single-pole): Shelly Plus 1PM behind switch
• Rationale:
  • Physical 3-way only where you actively walk between switch locations — avoids switch clutter at the entry.
  • Hardwired 3-way is mandatory on the stairwell for life-safety (stairs must be lightable even if Wi-Fi or HA is down).
  • Loft single-pole + HA shutoff from desk is acceptable because worst case is a 40ft walk back if HA is offline, not a hazard.
  • Per-circuit amp loads (1-3A) sit far below the 16A Shelly Plus 1PM resistive rating and well under the owner’s 8A per-circuit comfort target.
• Options not chosen:
  • 3-way on every main-floor zone (rejected — every entry flip would flood all task zones; cluttered 3-gang box at entry).
  • Shelly at each switch location, HA-linked (rejected for 3-way circuits — multi-location control breaks if HA is down; reliability worse than hardwired 3-way).
  • Single-pole at bottom of stairs only, HA handles top (rejected — stair safety requires physical control at both ends).
• Implementation:
  • 14/3 NM-B between 3-way switch boxes (vehicle bays run + stairwell run).
  • Deep 20 cu in boxes at switch locations to fit Shelly + toggle + splices.
  • Standard residential 3-way toggles (Leviton CS315-2W or equivalent).
• Related: Switch Topology & Smart Relay Placement; Physical Switch Locations; Smart Control Zones; Shelly wiring reference image

2026-04-17 — SLS Electric scope complete

• Area: electrical/contractor
• Decision: SLS Electric completed the full contracted scope (200A service, underground feeder, interior/exterior GFCI outlets, soffit wafer lights, entry-door light switch, 50A generator inlet, inspection pass). Final invoice received 2026-04-17. All remaining electrical work is DIY; SLS re-engagement reserved for particularly challenging tasks only.
• Status: ✅ Confirmed
• Source: 2026-04-17 - SLS Electric - Final Invoice.pdf; Electrical Contractors; Main Electrical Service

2026-02-10 — Insurance: Other structures coverage set to $70,000

• Area: insurance/financing
• Decision: Increase Frankenmuth “other structures” coverage from $28,900to$70,000 to cover the garage ($69K current value). Will increase further as improvements are completed. Endorsement HO 04 48 (Other Structures - Increased Limits) added to policy #6941907, effective 02/09/2026.
• Status: confirmed
• Annual cost: +$66/yr premium increase
• Source: Rummel Insurance; [[Insurance.pdf]]; [[Gmail - Garage construction is underway!.pdf]]

2025-09-05 — Drain strategy (updated 2025-10-22)

• Area: plumbing
• Decision: Lift bay graded level (optimal for lift installation); remaining 2 bays graded with shared central floor drain.
• Status: confirmed
• Options not chosen: Original proposal for center drain with 6” rear offset across all bays.
• Rationale: Level floor in lift bay prevents vehicle rolling and simplifies lift anchor installation; graded floors in other bays provide drainage for snow melt and washing.
• Source: 2025-09-05 - Site Staking - Marcus + Concrete; contractor discussion 2025-10-22

2025-09-11 — Lift slab and PEX coordination

• Area: structural
• Decision: Provide 6” slab with rebar, 4000–5000 PSI per lift spec; leave two 4’×4’ PEX-free pads with 12” buffer where columns will anchor; document PEX layout.
• Status: open
• Source: Lift; Car_Lift_Planning_with_Radiant_Slab

2025-09-11 — Plumbing vent rough-in

• Area: plumbing
• Decision: Install main 3” roof plumbing vent during build; cap inside until tie-in; plan gable terminations for other exhausts.
• Status: open
• Source: Utilities & Conduits; Garage Venting Reference

2025-09-11 — Mini-split approach

• Area: HVAC
• Decision: Use Mitsubishi MXZ Hyper-Heat outdoor unit; garage cooled via cassette/ducted head; upstairs via wall/ducted head (final sizing after Manual J).
• Status: open
• Source: HVAC Strategy; Chat Reference

2025-09-11 — Insulation: Conditioned zones

• Area: insulation
• Decision: Define which spaces to condition (garage, loft, both) to drive assembly choices.
• Status: open
• Options: garage unconditioned/loft conditioned; both conditioned; both unconditioned.
• Source: Garage_Insulation_Summary

2025-09-11 — Soffit lighting controls & sensors

• Area: electrical/lighting
• Decision: Use Shelly relay with Home Assistant; select motion sensing approach (hardwired PIR vs wireless); define grouping and CCT.
• Status: open
• Options:
  • Hardwired PIR(s) to Shelly SW input (parallel) vs wireless sensors.
  • Single circuit vs multiple zones.
  • 2700–3000K vs 3500–4000K.
• Source: Lighting; Garage_Soffit_Lighting_Summary

2025-09-11 — Insulation: Sloped roof approach

• Area: insulation
• Decision: Choose between fur-down + batts, flash-and-batt, or full spray foam for cathedral sections.
• Status: open
• Rationale: Balance cost, air sealing, and code compliance (R-49 in Zone 6a).
• Source: Insulation Strategy; Garage_Insulation_Summary

2025-10-13 — Hershberger contract scope

• Area: build
• Decision: Signed Hershberger proposal for 24’x40’x10’ stick-built garage with 8”x42” rat wall, 4” slab over 2” Creatherm foam, and 1/2” PEX radiant tubing (pressure-tested) plus sleeves for sewer, water, electrical, and fiber optic.
• Status: confirmed
• Options not chosen: No thicker slab/rat wall upgrade; alternate builders/packaged pole barn remained declined.
• Source: Hershberger’s Contract

2025-10-13 — Exterior finishes package

• Area: exterior
• Decision: Confirmed Burnished Slate metal roofing with front snow guard, white aluminum soffit/fascia, Dutch Lap Herringbone siding, and 3’ Versetta Ledgestone (Plum Creek) between doors.
• Status: confirmed
• Options not chosen: No shingle roof or alternate siding palettes; full-height masonry upgrade omitted except 3’ accent band.
• Source: Hershberger’s Contract

2025-10-13 — Openings and hardware

• Area: doors/windows
• Decision: Selected (2) 9’x8’ white insulated overhead doors with 3-pane lites and Genie 6170 jackshaft openers, (3) 40”x60” DH windows, (1) 36”x38” DH window, and 36” white entry door.
• Status: confirmed
• Options not chosen: Third overhead door/lift bay jackshaft not included; no alternate opener types or color packages.
• Source: Hershberger’s Contract

2025-10-13 — Interior shell + mechanical room prep

• Area: interior
• Decision: Contract includes 3’ enclosed stairway to bonus room, OSB floor deck, 1/2” OSB wainscot (4’) on loft walls, and framed mechanical closet at stair base.
• Status: confirmed
• Options not chosen: No drywall, insulation, or full loft finish during initial build.
• Source: Hershberger’s Contract

2025-10-22 — Slab temperature sensor conduit

• Area: radiant-heating
• Decision: Install ½” PEX conduit (10-14 ft into slab, 2” below surface) via additional EZ Loop at manifold for future slab temperature sensor; label “Sensor Conduit – Do Not Connect” and tape both ends before pour.
• Status: confirmed
• Options not chosen: Run conduit adjacent to existing loops (less secure); omit sensor conduit entirely (loses future flexibility).
• Rationale: Enables future thermostat/control upgrades with embedded slab temperature sensing without post-construction modifications; low-cost insurance for future HVAC optimization.
• Source: Decisions - Slab Sensor Conduit

2025-10-24 — Project financing

• Area: financing

Financial details and loan officer information redacted for privacy

• Source: Budget & Financing; Timeline

2025-11-07 — Utility installation phasing (electrical now, others spring)

• Area: utilities
• Decision: Install electrical service immediately (winter 2025-26); defer gas, water, sewer, and low-voltage to spring 2026 for installation in single shared trench.
• Status: confirmed
• Options not chosen: All utilities now (multiple separate trenches, peak season costs); all utilities spring (no power for construction).
• Rationale: Electrical service runs separate route from other utilities per electrician requirements; can be installed independently without blocking other work. Gas/water/sewer/low-voltage share common trench - most cost-effective to install together in single excavation during spring. Electrical service provides power for construction tools/lights all winter. VEVOR diesel heaters adequate for construction heat (40-50°F). Radiant heat most beneficial for finish work (drywall, painting) which happens in spring anyway. Spring contractor availability better than Dec-Jan peak season. Single shared trench saves $2,000-4,000 in excavation costs vs. multiple separate trenches.
• Source: Decision - Electrical Now Utilities Spring; Utilities & Conduits; Winter Construction Strategy; Action Plan - November 2025

2025-11-26 — Roof venting system (vented soffits + ridge vent)

• Area: exterior/insulation
• Decision: Roof assembly will use vented soffits + continuous ridge vent for proper attic/roof cavity ventilation.
• Status: ✅ confirmed and installed (Dec 12)
• Rationale: Vented roof assembly is required for the planned R-49 blown cellulose insulation in sloped roof sections. Air intake at soffits and exhaust at ridge prevents moisture accumulation and ice dams.
• Verification: Vented soffits installed along front eave (visible in Dec 12 photos); continuous ridge vent installed with metal roof (Dec 11-12).
• Source: Hershberger’s Contract; Insulation Strategy; December 12, 2025

2025-11-26 — WRB (Weather Resistive Barrier) / Housewrap

• Area: exterior/air-sealing
• Decision: Tyvek HomeWrap included in scope, confirmed with Marcus Dec 1.
• Status: ✅ confirmed and installed (Dec 8-12)
• Verification: Tyvek HomeWrap delivered Dec 11 (see photo); installed on all wall surfaces including dormers; visible in Dec 12 exterior shell photos with building fully wrapped before siding.
• Source: Hershberger’s Contract; Critical Pre-Insulation Requirements; December 12, 2025

2025-11-28 — Fume extraction system (separate from dust collection)

• Area: ventilation/safety
• Decision: Implement industrial-style negative-pressure fume extraction system completely separate from dust collection. Two sub-systems: (A) Hobby/light fabrication for loft workstations (resin printers, soldering, airbrushing) using 6” spiral steel duct trunk with 4-6” branches; (B) Heavy-duty paint booth extraction for automotive painting using explosion-proof equipment.
• Status: planning
• Options not chosen: Central vacuum system for all fumes (unsuitable - motor sparks, static risk, insufficient CFM); combined dust/fume system (safety hazard with solvents).
• Rationale: Fume extraction requires metal ductwork (no PVC - static/fire risk), explosion-proof motors for solvents, outdoor exhaust only (no recirculation), and higher CFM than dust collection. Paint booth exhaust must be completely separate due to C1D1/C1D2 requirements for automotive painting.
• Source: Utilities Planning - Air, Vacuum, and Fume Extraction; Fume Extraction Strategy

2025-11-28 — Pre-drywall utility stub-outs (air, fumes, vacuum)

• Area: utilities/framing
• Decision: Install capped utility risers during framing before insulation/drywall: (1) 3/4” Rapidair Maxline compressed air riser to loft with drip leg at base; (2) 6” spiral steel fume extraction riser to loft; (3) 12-18” rough opening for future paint booth exhaust fan.
• Status: action required — must be installed during December framing phase
• Options not chosen: Install after drywall (much more difficult, requires cutting finished surfaces); omit risers (loses future flexibility, more expensive to add later).
• Rationale: Pre-drywall installation costs ~$100-160inmaterialsvs.$500+ and significant disruption to retrofit after finishing. Provides future flexibility for loft workstation utilities. Compressed air riser prevents moisture issues with drip leg design.
• Action: Order 6” spiral steel duct, coordinate with contractor during framing week (Dec 2-3, 2025).
• Source: Critical Pre-Insulation Requirements; Fume Extraction Strategy; Compressed Air System Shopping List

2025-11-28 — Fume extraction electrical circuit

• Area: electrical
• Decision: Add dedicated 20A 120V circuit for fume extraction blower in loft ceiling area. Consider future 20A circuit (120V or 240V) for paint booth exhaust fan near Bay 1 or Bay 3.
• Status: planning — add to circuit schedule before electrical rough-in
• Rationale: Fume extraction blower requires dedicated circuit to avoid interference with other loads. Paint booth exhaust may require 240V depending on fan size (2,000-4,000+ CFM). Explosion-proof equipment for paint booth may have specific wiring requirements.
• Source: Electrical Planning; Fume Extraction Strategy

2025-12-02 — Exterior rigid foam insulation (not needed)

• Area: insulation
• Decision: Declined — Exterior rigid foam under siding is not needed for this project.
• Status: ✅ decided
• Options not chosen: 1-2” polyiso exterior rigid foam ($3,000-6,000 estimated).
• Rationale: The building has a split thermal envelope — the loft apartment is primarily insulated by attic floor insulation (R-49+), knee walls, and sloped ceiling sections, not the exterior garage walls. Exterior rigid foam would primarily improve the semi-conditioned garage level, which doesn’t need tight temperature control. The small gable-end wall sections exposed to the loft are minor surface area and adequately served by standard R-21 cavity insulation. Better ROI from: (1) maxing attic insulation to R-60, (2) quality knee wall insulation + air sealing, (3) upgraded windows (already ordered as change order), (4) insulation between garage ceiling and loft floor. Exterior rigid foam is not standard practice for detached garages/workshops; more common in high-performance homes or Passive House builds.
• Source: Critical Pre-Insulation Requirements; Insulation Strategy

2025-12-11 — Electrical contractor selection (SLS Electric LLC)

• Area: electrical
• Decision: Selected SLS Electric LLC (Steve) for 200A electrical service installation.
• Status: ✅ confirmed
• Quote: $4,610 total
• Scope included:
  • 200A panel with wire from house
  • GFI outlets (interior + exterior)
  • Double-gang switch
  • 3 soffit wafer lights
  • Two 1” low-voltage conduits
  • 50A generator inlet plug (after siding complete)
• Options not chosen: Seiter Electric ($4,600 for 200A — similar price but less responsive); Mr. Electric (quote received Dec 8 — higher price); other contractors who didn’t respond.
• Rationale: Competitive pricing, responsive communication, complete scope including generator plug, willingness to schedule around frozen ground conditions.
• Source: Electrical Contractors; 2025-12-11 - SLS Electric - Quote Summary (200A Service)

2025-12-18 — Electrical trenching delayed to spring 2026

• Area: electrical/utilities
• Decision: Postpone underground electrical trenching completion to spring 2026 due to frozen ground.
• Status: ✅ confirmed
• What was completed:
  • Wire buried along house foundation (~6-8 ft) where ground was thawed from building heat transfer
  • Wire spool stored at terminus for spring completion
• Issue encountered: Open area between house and garage had approximately 10” of frozen ground (unusually early and deep freeze for December). Largest available backhoe made only 3 feet of progress in 30 minutes.
• Options not chosen: Continue with larger equipment (not available); heat ground (impractical and expensive); wait for thaw (unpredictable timing).
• Rationale: Safe, practical decision. Building is weathertight and can wait for spring. Wire is secure at terminus. Attempting to force through frozen ground risks equipment damage and higher costs.
• Impact: Garage will not have power until spring 2026. Radiant heat system delayed to spring. VEVOR diesel heaters available for any winter work if needed.
• Source: Timeline; December 18, 2025

2026-02-01 — Loft bathroom priority (install now, kitchen can wait)

• Area: interior/plumbing
• Decision: Install loft bathroom with fixtures during initial finish phase; defer kitchen installation to future phase (guest house or apartment conversion).
• Status: decided
• Options considered:
  • Infrastructure only (rough-in now, fixtures later) — not chosen
  • Full bathroom + kitchen now — kitchen deemed unnecessary for primary use
  • Bathroom now, kitchen later — chosen
• Rationale: Bathroom provides daily convenience when working in garage/loft (office, workshop, projects). Walking to main house for bathroom breaks is impractical for regular use. Kitchen is less critical — can use main house for meals during office/theater use. Guest house and apartment conversion are 3+ year considerations; bathroom serves immediate needs while maintaining future flexibility. Incremental cost of fixtures vs infrastructure-only is minor relative to convenience gained.
• Future phases:
  • Phase 1 (current): Office/theater/workshop with bathroom
  • Phase 2 (3+ years): Guest house — add kitchenette (mini-fridge, microwave, sink)
  • Phase 3 (optional): Apartment conversion — full kitchen, separate entrance if needed
• Source: HVAC Strategy (bathroom conditioning via transfer fan); Electrical Planning (100A subpanel for future tenant)

2025-12-20 — Loft flooring selection (LVP recommended)

• Area: interior/finishes
• Decision: Recommend Lifeproof 22 MIL LVP with QuietWalk LV underlayment for loft flooring.
• Status: planning (samples to be ordered)
• Budget range: $2,300-3,300 depending on underlayment choice
• Options considered:
  • Budget: Lifeproof 6 MIL ($1,850) — not recommended for durability
  • Mid-range: Lifeproof 22 MIL + QuietWalk ($2,336) — recommended
  • Premium acoustics: Lifeproof 22 MIL + SoundGuard ($2,790) — best for home theater
  • Premium: Shaw Anvil Plus + QuietWalk ($2,872)
• Rationale: 22 MIL wear layer provides apartment-grade durability; QuietWalk IIC 71 underlayment provides good sound dampening for home theater use; light oak colors complement house honey oak floors; DIY-friendly click-lock installation; waterproof for thermal boundary location.
• Next steps: Order samples, compare to house floors, finalize color selection.
• Source: Loft Flooring Plan