How many asphalt tiles does it take to cover a designer 1500 sq ft roof??
OW TO CALCULATE the TOTAL SURFACE AREA of a ROOF So you can FIGURE the CORRECT AMOUNT of ROOF COATING MATERIAL NEEDED One must know the exact total surface area (in square feet) of a roof in order to be able to figure the correct amount of roof coating material needed to properly coat (paint or waterproof) a roof. The following factors affect significantly the correct calculation of surface area, and thus the correct amount of coating materials needed. (A) Roof Overhang & Exterior Wall Thickness (see Col. 1 on chart below) The inside dimensions of the building do NOT include the overhang of the roof beyond the exterior walls or the thickness of the exterior walls. For example, if the interior dimensions are 50 ft. x 60 ft. for an interior area of 3,000 sq. ft., and there is a 2 ft. overhang all around the building, and the exterior walls are 10 inches thick, then the flat surface area of the roof must be calculated not by the formula, 50 ft. x 60 ft., but on 55.67 ft. x 65.67 ft., whic
