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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.
The Size of the Roof (measured in square footage). The first step in determining the cost to replace a roof is to have the roof measured. A roofer will measure, and then give you an estimate per square. A square is a 10-by-10 foot area (or 100 square feet).he Size of the Roof (measured in square footage). The first step in determining the cost to replace a roof is to have the roof measured. A roofer will measure, and then give you an estimate per square. A square is a 10-by-10 foot area (or 100 square feet).