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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.
Estimate How Much the Snow on Your Roof Weighs Using These Guidelines from IBHS. Fresh snow: 10â12 inches of new snow is equal to one inch of water, or about 5 lb per square foot of roof space, so you could have up to 4 feet of new snow before the roof will become stressed.