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You need to be aware that most jurisdictions allow only two layers of shingles to be applied to the roof due to the load considerations. For example, a 15-square area of roof with two layers of average 250-pound shingle has a total weight of covering of 7,500 pounds, or nearly 4 tons of weight. The under layer for asphalt shingle is usually roofing felt with a course of ice and water shield covering the lowest 3 feet.
A roofâs size is the largest cost factor, Hood says. Roofers charge per roofing square. A 10-by-10-foot (100 square feet) area is equal to one roofing square. âFor example, if weâre working on a roof that is 3,000 square feet, itâs broken down into 30 squares,â Allen says.