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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.
The old roofing will weigh about 250 pounds per 100 square foot, per layer (and you have three layers on a roof of 400 to 600 square feet) You should plan how to dispose of the old material before starting the rip-off phase.he old roofing will weigh about 250 pounds per 100 square foot, per layer (and you have three layers on a roof of 400 to 600 square feet) You should plan how to dispose of the old material before starting the rip-off phase.