Roofing Calculator
Calculate roof area and estimate material quantity needed.
Actual roof area = plan area ÷ cos(slope angle); the factors are 1/cos of 10°, 20° and 45°. Overhangs, ridges and valleys are not included. The 10% waste allowance is already included in the material cost shown. Enter the per-m² price quoted by your supplier; waterproofing is not included.
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