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After getting multiplier, roof pitch and the dimensions, the size of a home's house-top could be calculated. Take the computed area and multiply it by the pitch multiplier. For example, the floor dimension is equal to 1,104 square feet and the roof pitch is low at 1.15. The resulting equation should look like: 1,104 x 1.15 = 1,270 sq. feet. Consequently, the estimated quantity of material needed f