Flat roofs that are typical of Southwest homes lead to an ever-present problem: Rain water pools in low spots and, with the extreme summer heat, cause the white coating to blister, eventually leading to roof damage and leaks. This is particularly true in the corners. I am thinking of building up the corners using plywood sheets supported on propely-slanted 2x2s and then using wood screws to secure the structure to the exisiting roof. This will be followed by sealing around the playwood and covering the entire area with cemented fiberglass tar paper in preparation for the white coating.
Am I going about it the right way? I have paid good money to so-called professionals with unsatisfactory results. Hence is my desire to undertake the project myself. Thanks!