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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.
Alright, letâs start with the basics. First, you have to determine the size of your roof. Roofs are measured in squares. A square in roofing terms is equal to 100 square feet. The average home is approximately 30 squares, meaning that their roof is 3,000 square feet. Here is a simple way to figure out the measurement of your roof.