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.
Metal roofs are often lighter than asphalt shingles. They weigh about 1.5 pounds per square foot, while asphalt shingles average 2 to 4 pounds per square foot. This means metal roofs can be installed over existing roofing without adding too much weight to the structure.