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How to Calculate Roofing Materials
Formula
Roof area depends on the footprint and the pitch. Steeper roofs have more surface area. A 10% waste factor covers ridges, hips, valleys, and cuts.
One roofing square equals 100 square feet. Standard asphalt shingles come 3 bundles per square.
Common use cases:
- Shingle replacement estimation
- New roof material ordering
- Roofing contractor bid comparison
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