This roofing calculator will estimate approximate cost to install a new TPO flat roof system (50, 60 or 80-mil). The calculator also provides an option to estimate the cost of installing competing single-ply flat roofing materials (PVC and EPDM rubber roofing), as well as Tar & Gravel and Built-up Roofing (Rolled Asphalt / Modified Bitumen). To estimate roofing cost, enter roof / building dimensions, choose tear-off options, new ISO insulation and roof curbs or penetrations (chimneys, skylights, roof hatch, parapet walls, etc).
How to estimate roof cost accurately:
- This calculator is only as accurate as the numbers you plug into it. If your measurements are off, so will be the estimated roof price and roof size. It is important that you accurately measure your roof. Include any overhangs, bump-outs, and parapet walls.
- Include all roof items into the calculator. Things like curb flashings (HVAC units, Chimneys, Skylights, Roof Hatches) or roof drains may seem of little importance to you, but they take considerable amount of time to flash properly and slow down the process.
- Don’t forget roof tear-off. Most states require that your roof may not have more than TWO layers of roofing materials (without special approval by building engineer or architect and permission from your City/Town building department). It is also recommended to remove all existing roofing materials down to roof deck, before installing a new roof. This allows you to remove all wet insulation and repair a rotted / rusted roof decking.
It is important to understand that these are only approximate numbers, and your actual price will greatly depend on your geographic location, your roof complexity, the contractor you choose to install your roof, and ever fluctuating cost of materials.
We provide this calculator for reference ONLY propose, and it is not a solicitation or offer to install any roofing products.
We recommend that you get at least 3 roofing quotes from reputable, local roofing contractors who specialize in Flat Roofing, and have extensive experience with Thermoplastic Single Ply roofing systems, such as TPO and PVC heat-welded membrane roofs. Always hire a contractor that has General Liability, Workers Comp and optionally Bond / Excess insurance. Also, ask for at least 3-5 references of jobs that are OVER 5 years old.
Read more about TPO Roofing Installation.
Related article: Which is better – TPO or EPDM Rubber roof?