This roofing calculator will estimate the approximate cost to install a new TPO roof system (50, 60 or 80-mil). The tool 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 the number of roof curbs or penetrations (chimneys, skylights, roof hatch, parapet walls, etc).
How to Estimate Your 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 size and price. It is important that you accurately measure your roof. Include any overhangs, bump-outs, and parapet walls.
Include all parts of the roof into the calculator. Things like curb flashings (HVAC units, Chimneys, Skylights, Roof Hatches) or 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 tear-off. Most states require that your roof may not have more than TWO layers of 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 materials down to the 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 figures. Your actual price will greatly depend on your geographic location, roof complexity, the contractor you choose, 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 quotes from reputable, local contractors who specialize in Flat Roofing, and have extensive experience with Thermoplastic Single Ply systems, such as TPO and PVC heat-welded membranes.
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?