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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.
This article teaches you the math formula to figure out how much roofing and underlayment you need to order. Roofing is talked about using the term square, as in This shed roof is 16 squares. A square refers to 100 square feet of roof or a 10 foot by 10 foot area. So a roof that has 1600 square feet of area has 16 squares. Remember that unless the roof is flat, the square footage of the building is different than the square footage of the roof. This is because of the pitch of the roof and the overhangs.