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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.
Quick Answer. A square of shingles weighs between 200 and 350 pounds. The weight of a shingle is generally an indicator of its life expectancy. Shingles consist of a mat covered with asphalt. A layer of gravel pressed into the asphalt gives the shingle its color and provides protection from ultraviolet light. Continue Reading.