Garage Construction Project

2025-11-18 - Truss Layout Schematic (Large Format)

4 min read

Truss Layout Schematic - Large Format Drawing

Truss Layout Engineering Schematic

Photo Details

  • Date: November 18, 2025
  • Time: 1:04 PM EST
  • Weather: Cloudy, 39°F. Indoor photo documentation.
  • Phase: Framing preparation – engineering documentation
  • Location: 309 E. 7th St., Clare, MI – indoor documentation
  • Subject: Large-format truss layout schematic (too large for standard scanner)

Description

Large engineering schematic drawing showing the complete truss layout and configuration for the 24’ x 40’ garage roof system. This drawing was included in the truss delivery packet and provides the master reference for truss placement during framing.

Document Details

Engineering Drawing Information:

  • Job Number: 123907 (visible on right side of drawing)
  • Page: 1 of 1 (layout drawing)
  • Source: Letherer Truss Inc., Clare, Michigan
  • Designer: Phil J. Stillwell
  • Drawing Type: Truss placement layout with profile elevation

Visible Elements

Left Section - Floor Plan Layout:

  • Building Footprint: 24’ wide x 40’ long rectangular plan
  • Bay Spacing: Five 8-foot bays marked across the 40’ length
  • Dimensions: Labeled as 8’ - 8’ - 12’ - 8’ - 8’ = 40’ total
  • Truss Positions: Individual truss locations marked with designations (A1, AX visible)
  • Grid Reference: Shows precise placement of each truss type
  • Width Markings: 24’ width clearly dimensioned

Right Section - Truss Profile:

  • Elevation View: Side profile showing roof pitch and truss geometry
  • Pitch: 10:12 slope visible in profile
  • Height: Approximately 11’ peak height shown
  • Overhang: 1’ overhang on each side indicated
  • Truss Shape: Standard attic truss configuration with flat bottom chord

Labeling & Annotations:

  • Truss type callouts (A1, AX, SP1, etc.) on layout
  • Dimensional annotations throughout
  • Job information panel on right edge
  • Construction notes and specifications

Physical Document Characteristics

  • Paper Size: Large-format engineering drawing (approximately 24” x 36”)
  • Condition: Folded for transport in delivery packet
  • Material: Standard architectural bond paper
  • Printing: Black line drawing on white background
  • Fold Marks: Multiple creases visible from folding for delivery

Documentation Context

This photograph was taken because the drawing was too large to fit on the standard scanner bed. The large-format schematic provides:

  1. Installation Reference: Exact truss placement for framing crew
  2. Type Identification: Shows which truss type goes in each position
  3. Dimensional Control: Verifies 8’ bay spacing and 24’ width
  4. Elevation Check: Confirms roof pitch and overhang specifications
  5. Building Inspector Reference: Allows verification against approved plans

Technical Specifications from Drawing

Building Dimensions:

  • Length: 40’ (five 8’ bays)
  • Width: 24’
  • Roof Pitch: 10:12 (10” rise per 12” run)
  • Overhangs: 1’ on each gable end
  • Peak Height: ~11’-3” (11 feet, 3-8/16 inches per loading ticket)

Truss Inventory (as cross-referenced with loading ticket):

  • 13x A1 24’ Attic trusses (standard)
  • 4x AX 24’ Attic Girder trusses (load-bearing)
  • 4x SP1 14’6” Special trusses
  • 8x T1 6’ Common trusses
  • 2x TX 6’ Common Girder trusses
  • 4x AM 2’ Mono trusses

Relationship to Other Documentation

This layout drawing is page 1 of the 8-page engineering packet delivered with the trusses. The subsequent pages (2-8) provide detailed engineering calculations and connection specifications for each truss type shown on this layout.

Cross-Reference:

  • Layout drawing (this photo) = Page 1 of packet
  • Pages 2-3 = PLY-1 QTY-4 engineering details
  • Pages 4-5 = PLY-1 QTY-13 engineering details
  • Page 6 = PLY-2 QTY-2 engineering details
  • Page 7 = PLY-1 QTY-8 engineering details
  • Page 8 = PLY-1 QTY-4 mono truss details

Construction Phase Impact

This schematic is the primary reference document that the framing crew will use to:

  1. Identify Trusses: Match each physical truss to its designated position
  2. Verify Spacing: Ensure proper 8’ on-center bay spacing
  3. Confirm Orientation: Orient attic trusses correctly (gable vs. rake ends)
  4. Plan Lifting: Sequence truss installation from one end to the other
  5. Inspect Work: Building inspector can verify placement against engineered plans

Installation Sequence Implied

Based on the layout, the typical installation sequence will be:

  1. Install gable end trusses first (likely the AX girder trusses)
  2. Work from one end to the other installing A1 standard attic trusses
  3. Install intermediate common trusses (T1/TX)
  4. Complete with mono trusses and special configurations (AM, SP1)
  5. Install temporary bracing per T.P.I. standards
  6. Add permanent lateral bracing and sheathing

Why This Photo Exists: This drawing was too large to scan on a standard flatbed scanner, so it was photographed to preserve the complete layout information digitally. The original paper drawing will be kept onsite during construction as a field reference for the framing crew.

Graph View

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