วิธีการคำนวณ Roofing

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A roofing calculator estimates the material needed to cover a roof, accounting for the pitch (slope) which increases actual roof area beyond the building footprint. Roofing material is measured in "squares" — one square covers 100 square feet.

คำแนะนำทีละขั้นตอน

1. 1Measure the building footprint: length × width
2. 2Calculate pitch factor: √(1 + (rise/run)²) where run is typically 12"
3. 3Actual roof area = footprint × pitch factor × (number of roof sections)
4. 4Add 10–15% waste for ridge caps, valleys, and cuts
5. 5Divide by 100 to get squares; multiply by 3 for shingle bundles

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