Flat Roof Materials
Any opinions on flat roof materials? Four types are most prevalent:
1. Torch down (also called modified bitumen?)
2. EPDM: For practical purposes, only available in black, since the white has a much shorter warantee.
3. TPO: Available in several colors
4. PVC: Available in several colors
How big a difference in heat gain will the color make? (black vs. white) This is in Maryland, near D.C., Zone 6B.
This is for a 360 square foot flat roof with a very minor slope (1/8th inch per foot) and about 8-inches of fiberglass insulation under the plywood deck. No pipes, skylights or other protrusions through the roof. On one side, it must be adhered to a brick wall; the other three sides have gutters.
Are the advantages of the rubber/plastic materials over torch down exagerated? Most local roofers who are highly recommended around here use torch down, since it is what they are experienced with it and can do a proper installation. Prices vary tremendously.