How to Calculate Sheathing
What is Sheathing?
Roof Sheathing Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formula
Sheets = Roof Area / 32 sf per sheet × 1.10 (10% waste)
Step-by-Step Guide
- 1Calculate total roof area including overhangs, add waste factor
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Input
2000 sf roof area
Result
Sheets = 2000/32 × 1.10 = 68.75 → 69 sheets
Common Mistakes to Avoid
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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