Formula or decision rule
row count = ceiling(deck width ÷ (actual board face width + specified gap)); total run = sum of row lengths- Use actual dimensions, not the nominal lumber name.
- The gap comes from the approved system or installation instructions.
- Handle borders, picture frames, stairs, and angled layouts as separate runs.
Deck takeoff inputs
| Input | Where it comes from | Output affected |
|---|---|---|
| Deck geometry | approved plan/site verification | row lengths |
| Actual board width | selected product | row count |
| Gap | installation detail | row count |
| Layout features | drawn plan | separate runs/cuts |
Work through the project
Start with the approved plan
Confirm framing, loads, footings, guards, stairs, ledger, fasteners, and permits before a finish-board takeoff.
Draw every board run
Show field rows, borders, stairs, breaks, and direction changes so the formula is tied to a buildable layout.
Check wood and hardware compatibility
Match species, treatment, exposure, fasteners, and connector requirements using product and code information.
Safety and scope
- This worksheet does not design a deck or establish allowable spans.
- Existing deck deterioration or unsafe connections require qualified assessment before resurfacing.
Sources and scope
Source links reviewed July 16, 2026. A review date is not the document's publication date.
- USDA Forest Products Laboratory: Wood Handbook: Wood as an Engineering MaterialUnited States · government guide
Structural deck design remains subject to local code and site-specific engineering requirements.
- National Institute of Standards and Technology: NIST Guide to the SI, Appendix B — Conversion FactorsUnited States · government standard
Code retains exact defining constants where NIST identifies an exact relationship.