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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 average roof is around 20 square. Bigger roofs obviously cost more to replace due to increased labor and materials. Learn how to estimate the size of your roof. Most roofers will have a predetermined price-per-square for shingle roofs, but donât take this figure as being set in stone.