The waxing crescent moon is defined to occur when the Moon is nearly, but not precisely, on a line with the Earth and Sun. This means that part but less than one-half of the Moon is illuminated by direct sunlight, creating a crescent moon.
NAPA estimates an average asphalt density of 145 pounds per cubic foot, or 3,915 pounds per cubic yard. For example, if your calculated volume is 25 cubic yards, multiplying 25 by 3,915 will give you an asphalt weight per cubic yard of 97,875 pounds, or about 49 tons.1  Tape measure.. Convert cubic feet to cubic yards. Because there are 27 cubic feet per cubic yard, you will divide your total cubic feet by 27. This gives you the volume of asphalt you will need.
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.