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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 lot of experienced roofers can look at a roof and come up with a rough estimate of the amount of material that will be pulled off but the weight can be a tricky thing to figure out. **Potential Weight is based on the averages 322.5 pounds/square but experts say the weight can vary between 245 and 400 lbs.