TPO Roof Repair, Installation, and Replacement
TPO roof repair restores watertight seams and patches on one of the most common flat roof membranes in the country. Whether you need a repair, a new TPO roof installation, or a full replacement, one call to Roofing Captain connects you with a local roofer who works with TPO.
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What Is a TPO Roof?
TPO stands for thermoplastic polyolefin. It is a single-ply membrane, usually white, that is rolled out over insulation and either mechanically fastened, fully adhered, or ballasted.
The seams are welded together with hot air, which creates a strong bond when done correctly. TPO is common on commercial buildings and is also used on some flat residential roofs, porches, and additions.
Common TPO Roof Problems
Most TPO trouble starts at seams and details rather than in the flat field of the membrane. Watch for these issues:
- Seams that were poorly welded or have separated
- Punctures from foot traffic, dropped tools, or hail
- Loose flashing at curbs, walls, and roof edges
- Shrinkage that pulls the membrane away from corners
- Ponding water near clogged drains
- Fastener back-out under the membrane in high wind areas
How TPO Roof Repair Works
A proper TPO repair is welded, not glued over. Weathered TPO must be cleaned and prepared so the new patch fuses to the old membrane.
The roofer probes seams to find weak spots, cuts away damaged material if needed, and heat-welds a compatible TPO patch over the area. Wet insulation under the repair should be replaced so it does not keep feeding the leak.
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TPO Roof Installation and Replacement
When the existing roof is beyond repair, TPO roof replacement is a common upgrade. The process usually looks like this:
- Inspection and moisture testing of the existing roof
- Tear-off, or a recover where code and conditions allow
- Deck repairs and new insulation boards, often tapered for drainage
- Membrane installation with fastened or adhered attachment
- Heat-welded seams and new flashing at all penetrations
- Seam probing and a final inspection
Pros and Cons of TPO
TPO has real strengths, but it is not the right fit for every roof. Talk through these points with your contractor.
- Pro: White surface reflects sunlight and can help with cooling
- Pro: Heat-welded seams are strong when installed well
- Pro: Widely available, so many TPO roofers know the system
- Con: Quality varies between products and membrane thicknesses
- Con: Older membranes can be harder to weld when repairing
- Con: Workmanship at seams matters a great deal
What Affects the Cost of TPO Roofing
Each TPO roofing company prices jobs based on the roof itself. Factors include roof size, membrane thickness, insulation needs, attachment method, tear-off versus recover, number of penetrations, access, and the warranty you choose.
How it works
Call the number on this page
Tell us what is happening with your roof: a leak, storm damage, an old roof or a new project.
Get connected to a local roofer
Your call goes to a roofing company that serves your area.
Get an inspection and estimate
The roofer explains the options. Ask for a written estimate and proof of license and insurance before any work starts.
Frequently asked questions
Can a TPO roof be repaired?
Yes. Punctures, small tears, and open seams can usually be repaired by heat-welding a TPO patch. The area must be cleaned and prepared first so the patch bonds properly.
Can you patch TPO with tape or roof cement?
Generic tape or roof cement is not a lasting fix for TPO and can make a proper repair harder later. Manufacturer-approved patch products or heat-welded patches are the usual approach. Ask your roofer which method they plan to use.
What is the difference between TPO and EPDM?
TPO is usually white with heat-welded seams, while EPDM is a black or white rubber membrane with taped or glued seams. Both are used on flat and low-slope roofs. Climate, budget, and the existing roof often decide which fits better.
Can TPO be installed over an existing roof?
In some cases, yes. If the old roof is dry and local code allows another layer, a TPO recover over cover board may be an option. A moisture survey is needed first.
Is TPO used on homes?
Yes. TPO flat roof installation is common on homes with low-slope sections, such as porches, garages, and modern flat-roof designs. Shingles are not made for these low slopes.
What should I ask TPO roofing contractors?
Ask how many TPO roofs they install, whether they hold manufacturer certifications, and how they test seams. Also ask about licensing, insurance, and what the warranty covers.