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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 square of shingles weighs 250 lbs. to 400 lbs. depending upon the type of shingle (see below). An important thing to keep in mind is that many roofs have multiple layers of shingles, so you must factor that in when determining weight and choosing a dumpster. For example, a 20 square roof with two layers of shingles will actually produce shingle waste equal to 40 squares. Know how many layers of existing shingles are on your roof prior to ordering the dumpster to ensure you choose the right one and avoid having to get a second dumpster later.