Roof Truss Calculator Project Checklist

Introduction

Truss projects fail on logistics, not lumber. The trusses that arrive wrong, late, or damaged — or arrive on time to walls that aren’t ready — all trace back to a skipped verification step. This checklist puts every verification in job order: what to confirm before you order, what to check when the quote comes back, how to prep for delivery day, and the setting-day sequence that ends with an inspector’s signature.

Start with your numbers: the Roof Truss Calculator gives you the truss count, rafter length, and ridge length from your dimensions. Then work this list top to bottom — each phase gates the next.

Phase 1: Before You Order

• ☐ Dimensions finalized: span (outside of wall to outside of wall), building length of truss run, pitch, and overhangs — measured from the framing drawings, frozen before engineering.
• ☐ Truss count calculated: (length ÷ spacing) + 1, in consistent units. Example: 40 ft at 24 in o.c. → (480 ÷ 24) + 1 = 21 commons + 2 gable ends.
• ☐ Spacing selected: 24 in (600 mm) o.c. default; 16 in (400 mm) for heavy snow, tile/slate roofing, or matching existing framing.
• ☐ Roofing material decided: shingle, metal, tile — the dead load drives the engineering; changing it later voids the drawings.
• ☐ Site location confirmed: exact address for the manufacturer to pull snow and wind loads; note elevation or map-boundary situations.
• ☐ Truss type chosen: fink for standard, attic for living space, scissor for vaulted ceilings — see the complete guide for profiles.
• ☐ Raised heel specified if energy code requires full-depth insulation at the eaves.
• ☐ Hip or gable confirmed: hip roofs need a manufacturer takeoff of girders and jacks from the plan.

Phase 2: Quote and Engineering

• ☐ Same package to 2–3 plants: identical dimensions, loads, and roofing so quotes are comparable.
• ☐ Quote contents confirmed in writing: does the quantity include gable-end trusses? Delivery? Engineering fees? Quote validity period (typically 15–30 days)?
• ☐ Drawings reviewed: sealed engineering drawings checked against your dimensions — span, pitch, heel height, overhang, lumber grades, plate sizes, design loads.
• ☐ Connector schedule on file: truss-to-wall connector model, nail size/quantity per joint, uplift ratings.
• ☐ Bracing plan on file: permanent lateral and diagonal bracing details from the engineering.
• ☐ One spare ordered for runs over ~15 trusses.
• ☐ Permit application submitted with the sealed truss package — see the code compliance guide for the full submittal list.
• ☐ Lead time confirmed: engineering 1–2 weeks, fabrication 2–4 weeks — scheduled against the wall-framing completion date.

Phase 3: Delivery Day Prep

• ☐ Walls verified: plates level, building square (equal diagonals), anchor bolts set, actual span matches the truss drawings to the inch.
• ☐ Delivery path staged: firm straight approach for the flatbed, room to maneuver, overhead wires noted, soft ground reinforced.
• ☐ Crane booked for delivery day: trusses lift from trailer to wall in one operation — no double handling.
• ☐ Bracing lumber on site: 12+ straight 2×4s, nail gun, nails — assigned to a crew member, not an afterthought.
• ☐ Layout snapped: on-center marks on both wall plates from a common zero point before the first truss arrives.
• ☐ Crew briefed: minimum four adults, lift points at panel joints only, handling guide from the manufacturer read by the lead.
• ☐ Storage plan if delayed: banded, supported, covered — never flat on wet ground. The pro tips guide covers storage.

Phase 4: Setting Day

• ☐ First truss plumb and braced: gable end set first, plumbed, braced to ground stakes — it references the whole roof.
• ☐ Trusses on layout marks: each truss lands on its plate mark, spaced per the design — no eyeballing.
• ☐ Temporary bracing progressive: lateral bracing along chords with each truss; diagonal bracing back to the structure as the run grows.
• ☐ Connectors per schedule: the specified tie/strap model with the specified nails at every bearing — the material guide lists the hardware.
• ☐ No field modifications: no cutting, notching, or drilling — any fit problem stops work and goes to the manufacturer for written approval.
• ☐ Sheathe progressively: completed sections get sheathing the same day; sheathing is structural diaphragm bracing.
• ☐ Permanent bracing installed per the drawings before temporary bracing comes down.

Phase 5: After Setting

• ☐ Damaged pieces documented: any transport or handling damage photographed and reported to the manufacturer for credit/replacement.
• ☐ Inspection scheduled: drawings, connector schedule, and bracing plan on site for the inspector.
• ☐ Ventilation and insulation plan executed: baffles at eaves, soffit-to-ridge airflow per code — heel height was specified for this in Phase 1.
• ☐ Temporary bracing removed only after sheathing and permanent bracing are complete.
• ☐ Final walkthrough: every truss plumb, every connection fastened per schedule, no modifications — ready for roofing.

The most expensive checklist failures are well documented in the common mistakes guide — each item above exists because skipping it has cost someone a redelivery, a failed inspection, or worse.

Related Guides

• Pro Tips — the field habits behind each checklist item.
• Common Mistakes — what happens when steps get skipped.
• Code Compliance — permits, inspections, and submittal documents.
• Estimating Guide — the takeoff that feeds the material order.
• Complete Guide — truss types, spacing, loads, worked examples.

Get Your Number

Print this list and work it in order: finalize dimensions, engineer through the manufacturer, verify the walls, stage the site, set plumb and braced, and pass inspection with unmodified trusses installed exactly as drawn. The arithmetic that starts it all — truss count, rafter length, ridge length — takes seconds in the Roof Truss Calculator. Everything after that is verification, and verification is what separates a smooth one-day setting job from a month of expensive fixes.

Disclaimer: Calculator results are planning estimates based on the dimensions you enter. Roof trusses are engineered structural products — always order from a manufacturer that supplies sealed engineering drawings, verify spans and loads with a licensed engineer, and check your local building code before construction.