TPO roofing: cost, installation and lifespan
TPO (thermoplastic polyolefin) roofing is a single-ply, heat-welded membrane used on flat and low-slope roofs. Installed on a commercial building it typically costs $6 to $12 per square foot in 2026 and lasts about 20 to 30 years. It comes in 45, 60 and 80 mil thicknesses, usually in reflective white.
What is TPO roofing?
TPO is a single-ply roofing membrane made from thermoplastic polyolefin and reinforced with a polyester scrim. Manufacturers make it to ASTM D6878, the standard specification for TPO sheet roofing, and sell it mostly in white, with gray and tan options. Because it is a thermoplastic, overlapping sheets melt together into one when heat-welded, unlike EPDM rubber, which needs tape or adhesive at the seams.
White TPO reflects much of the sun's heat. One major manufacturer's data sheet lists a Cool Roof Rating Council (CRRC) solar reflectance of 0.79 when new and 0.69 after three years of weathering. ENERGY STAR ended its roof products program in 2022, so if your energy code, utility program or tenant requires a cool roof, check the product's CRRC rating instead.
How TPO roofing is installed
A TPO roof is built in layers: insulation and usually a cover board over the deck, the membrane attached by one of several methods, and seams and details sealed with hot air. The attachment method is the biggest installation choice, and it changes the price.
| Method | How it holds | Notes |
|---|---|---|
| Mechanically attached | Screws and plates fasten the sheet through the seam laps | The usual lower-cost attached option |
| Fully adhered | Bonding adhesive glues the whole sheet (or a fleece-backed sheet) to the substrate | Costs more; smooth surface with no plates under the sheet |
| Induction-welded | The sheet is welded from above to coated plates that hold the insulation | No fasteners through the new membrane and fewer seams |
| Self-adhered | Factory-applied adhesive on the back of the sheet | Peel and stick, with no field-applied bonding adhesive |
| Ballasted | Loose-laid and held down by stone or pavers | Lowest cost, but the structure must carry the weight and the slope must be low |
Seams are welded with an automatic hot-air welder in the field and a hand welder at corners and flashings. Pipes, curbs and drains are sealed with matching TPO flashing and pre-formed accessories. On a re-roof, the old roof is either torn off to the deck or, if it is dry and has only one existing covering, re-covered with a cover board under the new membrane. When a manufacturer system warranty is part of the job, the manufacturer inspects the finished roof before issuing it.
TPO membrane thickness: 45, 60 or 80 mil
TPO is sold in 45, 60 and 80 mil thicknesses (a mil is a thousandth of an inch), and 60 mil is the most common commercial choice. Thicker sheets cost more and qualify for longer manufacturer warranties.
| Thickness | Nominal | Typical use |
|---|---|---|
| 45 mil | 0.045 in | Budget roofs and shorter warranties |
| 60 mil | 0.060 in | The most common commercial specification |
| 80 mil | 0.080 in | Longest warranties, rooftop foot traffic, harsh exposure |
The ASTM D6878 standard sets a minimum overall thickness of 0.039 inch and a minimum layer of 0.015 inch over the scrim, so a nominal 45-mil sheet can measure slightly thinner. The layer above the scrim is what weathers, which is why some manufacturers publish their "thickness over scrim." Ask for it when you compare bids.
TPO roofing cost per square foot
On a commercial roof, TPO typically costs $6 to $12 per square foot installed, or about $70,000 to $90,000 for a 10,000 sq ft roof with 60-mil mechanically attached membrane. Thickness and attachment drive most of the difference.
Prices reviewed October 2026
| TPO specification | Installed cost per sq ft |
|---|---|
| 60 mil, mechanically attached | $7–$9 |
| 60 mil, fully adhered | $8–$12 |
| Ballasted | $5–$8 |
| 80 mil, fully adhered, long warranty | $10–$14 |
| Tear-off of an existing roof | add $1–$3 |
How we estimate these costs: ranges are compiled from published 2026 industry cost data and typical commercial contractor pricing, and assume new insulation, standard access and one existing roof layer. Small roofs cost more per square foot because of minimum charges.
Insulation upgrades, tapered insulation for drainage, rooftop equipment and the warranty term add to these figures; see the full breakdown in our commercial roof replacement cost guide. For a house, porch or garage, see flat roof replacement cost.
How long does a TPO roof last?
A well-installed TPO roof typically lasts about 20 to 30 years. Thicker membranes, careful welding, good drainage and twice-yearly inspections push it toward the long end; ponding water, heavy foot traffic and skipped maintenance shorten it. Manufacturer system warranties run up to 30 years on qualifying assemblies, but treat a warranty as coverage terms, not a lifespan promise.
TPO vs EPDM vs PVC
TPO, EPDM and PVC are the three main single-ply membranes: TPO is the reflective middle option, EPDM is usually cheapest, and PVC costs most but resists grease and chemicals.
| Feature | TPO | EPDM | PVC |
|---|---|---|---|
| Material | Thermoplastic polyolefin with polyester scrim | Synthetic rubber (thermoset) | Polyvinyl chloride (thermoplastic) |
| Seams | Hot-air welded | Seam tape or adhesive | Hot-air welded |
| Usual color | White (also gray, tan) | Black (white available) | White and other colors |
| Thicknesses | 45, 60, 80 mil | 45 to 90 mil | 50 to 80 mil |
| Installed cost per sq ft | $6–$12 | $5–$10 | $7–$15 |
| Typical service life | 20–30 years | 25–30 years | 25–30 years |
| Best for | Reflective roofs at a moderate price | Lowest cost, colder climates | Grease or chemical exposure, such as restaurants |
Thicknesses from manufacturer specifications; cost and service-life ranges from published 2026 industry data.
Pros and cons of TPO
Advantages
- Reflective white surface that can help meet cool-roof requirements.
- Heat-welded seams that fuse into one sheet.
- Lower installed cost than PVC, with several attachment methods to fit the building and budget.
- Available in thicknesses up to 80 mil for longer warranties.
Drawbacks
- Weld quality is everything: one major manufacturer calls improper welds the most common and costly TPO mistake.
- Formulations differ between manufacturers, so the brand and product matter.
- Less flexible than PVC, and not the membrane for roofs exposed to grease or chemicals.
- Rooftop service traffic can puncture it, so walkway pads belong around equipment.
TPO for residential low-slope roofs
TPO also works on homes, wherever a roof is too flat for shingles: porches, additions, garages and row houses. Building codes only allow asphalt shingles on slopes of 2:12 or steeper, and new single-ply roofs are designed with at least a quarter inch of slope per foot so water drains. Small residential jobs cost more per square foot than commercial ones because setup and minimum charges are spread over fewer square feet. See flat roof replacement cost for home pricing, or roof repair for a leak.
Finding TPO roofing contractors near you
The fastest way to find TPO roofing contractors near you is to request quotes from several and compare them on the same specification. Use the form on this page and we will match you with up to four independent contractors in your area, free. When you talk to them, ask:
- Which TPO manufacturers approve them as installers, and whether they can offer that manufacturer's system warranty.
- How many TPO roofs they have installed on buildings like yours, with references.
- How they check welds and seams before the manufacturer's inspection.
- Which thickness, attachment method, insulation and cover board their price includes.
For more on vetting contractors and choosing a system, see our commercial roofing guide, or browse roofers by state and city.
TPO roofing: FAQs
What is TPO roofing?
TPO (thermoplastic polyolefin) roofing is a single-ply membrane for flat and low-slope roofs. It is reinforced with a polyester scrim, made to the ASTM D6878 standard, usually white, and joined at the seams by hot-air welding, which fuses overlapping sheets into one.
How much does TPO roofing cost per square foot?
TPO roofing typically costs $6 to $12 per square foot installed on commercial roofs in 2026: about $7 to $9 for 60-mil mechanically attached, $8 to $12 for 60-mil fully adhered and up to about $14 for 80-mil fully adhered systems with long warranties. Tearing off an old roof adds about $1 to $3 per square foot.
How long does a TPO roof last?
A well-installed TPO roof typically lasts about 20 to 30 years. Membrane thickness, weld quality, drainage, foot traffic and maintenance decide where it lands. Manufacturer system warranties run up to 30 years on qualifying assemblies, but a warranty term is not a promise of lifespan.
What are the disadvantages of TPO roofing?
TPO depends on good welding: one major manufacturer calls improper welds the most common and costly mistake on a TPO roof. Formulations vary between manufacturers, it is less flexible than PVC, it is not the membrane to use where grease or chemicals reach the roof, and heavy foot traffic needs walkway pads to avoid punctures.
Which lasts longer, TPO or EPDM?
Published service-life estimates are similar: about 20 to 30 years for TPO and 25 to 30 for EPDM. Installation quality, seams and maintenance matter more than the membrane type. TPO seams are welded, while EPDM seams rely on tape or adhesive.
Is TPO cheaper than shingles?
Per square foot, usually not: TPO typically costs more to install than asphalt shingles on a house. But building codes only allow asphalt shingles on slopes of 2:12 or steeper, so on a flat or low-slope roof the real choice is TPO against EPDM, PVC or modified bitumen. See flat roof replacement cost.
What thickness of TPO should I use?
60 mil is the most common commercial specification and a sensible default. Choose 80 mil if you want the longest manufacturer warranty, expect rooftop foot traffic or face harsh exposure. 45 mil is the budget option and carries shorter warranties.
Do you glue down TPO roofing?
Sometimes. Fully adhered TPO is glued to the insulation or cover board with bonding adhesive. TPO can also be mechanically fastened, induction-welded to plates, self-adhered with a factory adhesive backing, or loose-laid under ballast.
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