Flat Roof Calculator

TPO, EPDM, Modified Bitumen & Built-Up Cost

The Flat Roof Calculator estimates membrane material, fasteners, adhesive, and total cost for low-slope and flat commercial or residential roofs. Select TPO, EPDM, modified bitumen, or built-up roofing (BUR), enter the roof area, and the tool returns roll count, adhesive gallons, fastener count, and a full cost breakdown. TPO is the most popular single-ply membrane for new commercial construction; EPDM is the workhorse for residential flat roofs and additions.