Roof Sheathing Calculator

Calculate how many 4×8 plywood sheets you need for your roof, accounting for pitch and waste factor.

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Plywood Sheets Needed
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How to Calculate Roof Sheathing

Calculating roof sheathing involves several key steps:

1. Calculate Total Roof Area

First, multiply the roof length by width to get the base area. Then multiply by the pitch factor to account for the roof's slope.

2. Account for Standard Plywood Size

Standard plywood sheets are 4×8 feet (32 square feet). Divide your total roof area by 32 to get the base number of sheets needed.

3. Add Waste Factor

Add 10-15% extra for waste, cuts around vents, and potential damaged sheets.