Flat roof & foam Typical Price Range To Install a new Roof Low $4,090 Average $5,138 High $7,418 See costs in your area By | Sep 16, 2020 ROOFING HELP – Get Answers About Roof Leaks & Repair, Choosing Contractors, Materials, etc. › Flat roof & foam 0 Vote Up Vote Down Dallas asked 4 years ago Hello, i have a flat roof that is being replace, it was suggested that we have ridged foam installed under the membrain. how much foam is ideal? is there such a thing as too much? thanks D Please login or Register to submit your answer Username or Email Address Password Remember Me Published: September 16, 2020 There are: 0 Comments