Roof Sheathing Calculator
Calculate roof sheathing materials, panel counts, and installation costs for your roofing project. Get precise measurements for plywood or OSB sheathing.
Step 1: Roof Dimensions
Roof Measurements
Accurate roof dimensions are crucial for calculating the correct amount of sheathing. Measure the full length along the ridge and the width from eave to ridge.
Step 2: Sheathing Details
About Roof Sheathing
Roof sheathing provides structural support for roofing materials. OSB is most common for residential roofs, while plywood offers better moisture resistance.
Roof Sheathing Calculation Results
Total Project Cost
Material Requirements
Installation Notes
For standard residential roofs, space nails 6″ apart along panel edges and 12″ apart in the field. Always follow local building codes and manufacturer specifications.
Fastener Requirements
| Fastener Type | Size | Quantity | Spacing |
|---|---|---|---|
| Roofing Nails | 8d (2.5″) | 800-900 | 6″ edges, 12″ field |
| Deck Screws | #9 x 2.5″ | 700-800 | 6″ edges, 12″ field |
| Construction Adhesive | 29 oz. Tube | 10-12 | Bead along joists |
Material & Cost Breakdown
Calculation Formula
Total Panels = (Roof Area × Waste Factor) / Panel Area
Calculate roof area considering pitch factor. Multiply by waste factor (typically 10-25%) for cutting and errors. Divide by panel area (e.g., 32 sq ft for 4×8 panel) to determine total panels needed.
Cost Comparison by Material
| Sheathing Type | Cost per Panel | Panels Needed | Total Material Cost | Best For |
|---|---|---|---|---|
| OSB (7/16″) | $28.50 | 45 | $1,282.50 | Standard Residential |
| Plywood (1/2″) | $42.75 | 45 | $1,923.75 | Moisture Resistance |
| Tongue & Groove | $68.00 | 45 | $3,060.00 | Traditional/Historic |
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