TPO & EPDM Roof Cost Calculator

Low-Slope Membrane Cost per Sq Ft, per Square & Total

The TPO & EPDM Roof Cost Calculator prices a low-slope membrane roof the way a commercial estimator does: membrane, attachment method, insulation and tear-off as separate line items. Pick TPO 60 or 80-mil, EPDM 60 or 90-mil, PVC 60-mil or modified bitumen, choose mechanically fastened, fully adhered or ballasted attachment, add the insulation R-value you plan to install, and the tool returns installed cost per square foot, per square, and a total project range. Installed TPO typically runs $5-$9 per sq ft for 60-mil, EPDM $4.50-$8, and PVC $7-$12, with polyiso insulation adding $2.60-$4.60 per sq ft. Most of the difference between competing flat roof quotes comes from membrane thickness, insulation R-value and attachment method, so write the assembly into the contract before comparing prices. Pair with our Flat Roof materials calculator, Roof Coating calculator and Insulation calculator.