By The Roofing Brief Team. Last reviewed: October 2026.
TPO roofing installation cost in 2026 lands between $7 and $14 per square foot for most U.S. commercial projects in our planning ranges, with the spread driven by membrane thickness (60-mil vs. 80-mil), attachment method (mechanically attached vs. fully adhered vs. ballasted), insulation R-value (R-25 vs. R-30 vs. higher), cover board choice, and warranty term. A 20,000 sq ft warehouse with 60-mil mechanically attached TPO over R-25 ISO and a basic 15 year material warranty might land at $7.50 per square foot installed. Related: Industrial roof repair. The same building with 80-mil fully adhered TPO over R-30 ISO, Securock cover board, and a 30 year No Dollar Limit total system warranty lands at about $11.00 in the worked example below, and higher once tapered insulation or a gravel built-up tear-off is added.
The gap between those two specs buys three things you can check on a bid: membrane thickness, attachment method and warranty term. On thickness alone, the Carlisle Sure-Weld TPO data sheet (December 2025) lists a minimum puncture resistance of 300 lbf for 60-mil and 400 lbf for 80-mil Sure-Weld Extra. For the repair side of the same buildings, see our commercial roof repair costs by type.
Published TPO price benchmarks
Our ranges are planning estimates for commercial reroofs, not survey data; the table sets them beside two published guides.
| Source | Date | Installed price per sq ft | What it covers |
|---|---|---|---|
| HomeGuide TPO roofing cost | April 19, 2024 | $4 to $10; $5 to $12 with old roof removal | Mostly residential and small roofs; labor $2.50 to $4.50, removal $1 to $2, membrane $1.00 to $2.50 per sq ft |
| General Roofing Co. TPO pricing guide | 2026 | $8.04 to $10.29 basic installed; $10 and up with tear-off or upgrades | Standard commercial low-slope system in favorable conditions |
| The Roofing Brief planning range | October 2026 | $7 to $14 | Commercial reroof by thickness, attachment, R-value, cover board and warranty |
HomeGuide also prices the membrane system alone by thickness: 45-mil at $2.00 to $3.00 per sq ft fastened and $2.80 to $3.20 adhered, and 60 to 75 mil at $2.20 to $3.10 fastened and $3.00 to $3.50 adhered, before labor.
Membrane thickness and attachment method: the two biggest price drivers
Carlisle sells its Sure-Weld reinforced TPO in 45-mil, 60-mil and 80-mil (Sure-Weld Extra, 2.03 mm) sheets, in field widths up to 16 ft, per its December 2025 data sheet. The mil number is the nominal thickness in thousandths of an inch, and ASTM D6878, the TPO material standard, sets the floor each sheet must meet. Thicker sheet carries more polymer over the scrim, which is where puncture and weathering resistance come from. For how TPO fits among other low-slope systems, see our guide to commercial roof types.
TPO membrane specs by thickness
| Property (test) | ASTM D6878 minimum | 45-mil | 60-mil | 80-mil Extra |
|---|---|---|---|---|
| Thickness over scrim, in (ASTM D7635) | 0.015 | 0.018 typical | 0.024 typical | 0.034 typical |
| Breaking strength, lbf (ASTM D751 grab) | 220 | 225 min | 250 min | 350 min |
| Puncture resistance, lbf (FTM 101C 2031) | No requirement | 250 min | 300 min | 400 min |
| Dynamic puncture, watertight after (ASTM D5635) | Not listed | 12.5 J | 22.5 J | 30.0 J |
| Field seam strength, lbf/in (ASTM D1876 peel) | No requirement | 25 min | 25 min | 40 min |
| Typical weight, lb per sq ft | Not listed | 0.25 | 0.33 | 0.45 |
Source: Carlisle Sure-Weld TPO data sheet, reprint code 600515, dated 12.03.25. Carlisle also lists a UL 2218 Class 4 hail rating and a white SRI of 99 for the line. Other makers publish their own sheets; compare the same rows before accepting a substitute membrane.
60-mil mechanically attached: $7 to $9 per square foot installed. This is the cost-leader spec for warehouse, manufacturing, and big-box retail. The membrane is rolled out, fasteners and plates secure it through the cover board into the deck on a defined pattern, and seams are hot-air welded. Uplift resistance comes from the fastener density in the engineered or FM Approvals listed pattern, so corners and perimeters get tighter spacing than the field. It is the fastest of the three attachment methods to install. Ask which warranty term (material-only or NDL, and how many years) the bid includes; the sequence is laid out in our commercial roof installation step-by-step.
60-mil fully adhered: $9 to $12 per square foot installed. The membrane is bonded to the cover board with bonding adhesive, which spreads the uplift load across the whole sheet instead of concentrating it at fastener rows, the reason adhered assemblies are common in coastal Florida, Texas and Gulf-state wind zones. Bonding adhesive adds about $0.70 to $1.20 per sq ft in material and slows the install. If PVC is also on the table, see our TPO vs PVC membrane comparison. This is the spec for office buildings, schools, and any high-wind-zone application.
80-mil mechanically attached: $8 to $11 per square foot installed. The 80-mil thickness is the puncture-resistance upgrade for roofs with heavy foot traffic, frequent rooftop equipment service, or hail exposure. Per Carlisle’s sheet, 80-mil adds 100 lbf of minimum puncture resistance over 60-mil (400 vs 300 lbf) and 0.010 in more polymer over the scrim. Manufacturers commonly reserve their longer warranty terms for 80-mil, though Carlisle notes its 80-mil special colors are limited to warranties up to 20 years. For the full data set, see the full 2026 Roofing Cost Report.
80-mil fully adhered: $10 to $14 per square foot installed. Related: TPO membrane pricing by mil thickness. Top-tier spec: the thickest standard sheet with the adhered load path, and the one manufacturers generally reserve their longest NDL terms for. Confirm the maximum term on the maker’s current warranty guide, because terms change by thickness, attachment and color. Most common on Class A office, healthcare, and any owner who plans a 25 year hold.
Ballasted TPO: $5 to $8 per square foot installed. The membrane is loose-laid and held in place by river rock or pavers. Cheap and fast, but heavy: the deck and framing must be checked for the ballast weight, and wind design follows ANSI/SPRI RP-4 for ballasted single-ply roofs. Leaks are hard to find without moving rock. Mostly used now for retrofit of older ballasted roofs where the building’s structural design assumes the load. Rarely specified for new construction in 2026.
Carlisle’s data sheet lists three attachment methods for Sure-Weld: fully adhered with bonding adhesive, mechanically fastened with plates and fasteners in the seam overlap, and induction-welded to fastened plates under the sheet. The choice also sets the warranty options, because NDL terms differ by attachment method, and the leak pattern: water under a mechanically attached sheet can travel along the deck before it shows inside. See our TPO vs EPDM roofing comparison for how this stacks against the alternative single-ply chemistry.
Insulation: ISO R-value drives 15% to 25% of total cost
Polyisocyanurate (ISO) insulation is what sits between the deck and the cover board on virtually every modern commercial TPO install. The R-value spec determines both energy performance and cost. The minimum comes from whichever IECC or ASHRAE 90.1 edition your jurisdiction adopted, not from a 2026 rule. Under the 2018 IECC (Table C402.1.3), insulation entirely above the deck must reach R-25ci in climate zones 2 and 3 and R-30ci in zones 4 to 6, per Carlisle’s energy code summary; later editions and state amendments can be higher.
R-25 ISO (about 4.25 in): about $1.50 per square foot installed. Sika’s Sarnatherm ISO data sheet lists an LTTR of 25.2 at 4.25 in (5.7 per inch at 1 in). Under the 2018 IECC it meets the above-deck minimum only in climate zones 2 and 3.
R-30 ISO (about 5.2 in): about $1.80 per square foot installed, for example two 2.6 in layers at LTTR 15.0 each per the Sika sheet. It meets the 2018 IECC minimum for climate zones 4 to 6.
R-38 ISO (about 6.6 in): about $2.30 per square foot installed, for example 4.0 in (LTTR 23.6) plus 2.6 in (LTTR 15.0). Spec for high-performance buildings, LEED-certified projects, and northern climate zones (6, 7, 8).
Tapered ISO system: add 10% to 25% to insulation cost depending on slope complexity. Tapered insulation establishes positive drainage on otherwise flat decks. The IBC (Section 1507.12.1) sets a minimum design slope of 1/4:12 (2 percent) for thermoplastic single-ply roofs, so a dead-flat deck needs tapered board or structural slope on a new low-slope roof. The complexity (crickets, saddles around drains, valleys) drives the upper end of the cost band.
One detail that matters: cheap ISO board (no facer, or facer that delaminates) is a false economy. The cover board fastens to the ISO facer. Facer failure compromises wind uplift performance and voids manufacturer warranties. Spec name-brand ISO (Atlas, Carlisle, Firestone/Holcim, GAF, Johns Manville) and verify the facer type with the contractor.
Cover board: the $0.50 to $0.80 upgrade that prevents the most common failures
Cover board, usually a 1/4 in or 1/2 in gypsum or high-density polyiso board, sits between the ISO and the TPO. It adds hail-impact resistance, foot-traffic protection and a firm substrate for adhesive. Carlisle notes its FM approved assemblies pass FM 4470 for foot traffic. Three options:
Gypsum cover board (Securock from USG, DensDeck from Georgia-Pacific): add $0.50 to $0.80 per square foot. Hail-rated, used in UL Class A fire-rated assemblies, and dimensionally stable. These two gypsum boards are the ones to look for by name on a bid.
High-density ISO cover board (HD ISO): add $0.40 to $0.65 per square foot. Cheaper than gypsum and works in most applications, but doesn’t match gypsum on hail or fire performance.
Perlite board: add $0.30 to $0.50 per square foot. Older spec, increasingly rare in new commercial work, but still occasionally specified for moisture absorption applications.
The omission of cover board entirely is a cost-cutting move that some bids will hide. A TPO membrane installed directly on ISO is allowed by some manufacturers but typically with reduced warranty terms and degraded hail performance. If you’re comparing bids and one is $0.60 per square foot cheaper than the others, check whether they omitted cover board. The savings can come back as hail damage repairs and a shorter warranty term.
Fasteners, plates, adhesives, and accessories
The mechanical attachment hardware (steel fasteners and stress-plates) for mechanically attached systems runs about $0.40 to $0.70 per square foot. Fastener spacing in the seam and the width of the perimeter and corner zones come from the building’s ASCE 7 wind-load calculation and the FM Approvals or manufacturer listing, so corners always get denser rows than the field. Ask for the uplift calculation with the bid.
Bonding adhesives for fully adhered systems add about $0.70 to $1.20 per square foot to material cost depending on the adhesive type. Low-VOC adhesives are required where air districts cap adhesive VOC content, such as California’s South Coast AQMD under Rule 1168.
Accessory components (walk pads, pipe boots, T-joint covers, edge metal, drain flashings) typically add $0.30 to $0.70 per square foot of total accessory budget. These are not optional and should not be value-engineered out of a bid.
Total cost breakdown: a typical 2026 commercial TPO install
| Line item | Cost per sq ft |
|---|---|
| Tear-off of existing roof | About $1.20 (single-ply about $0.80, gravel BUR $2.00+) |
| R-30 ISO insulation | $1.80 |
| Securock cover board | $0.65 |
| 60-mil TPO membrane (material) | $1.40 |
| Fasteners and plates | $0.55 |
| Labor for membrane install | $2.20 |
| Accessories (drains, flashings, edge metal, walk pads) | $0.50 |
| Mobilization, dumpster, crane, overhead, profit | $0.70 |
| Total | About $9.00 |
Illustrative planning figures, not a quote, for a 30,000 sq ft warehouse reroof (60-mil mechanically attached TPO, R-30 ISO, Securock cover board, 20-year NDL warranty). An 80-mil fully adhered spec with a 30-year NDL warranty runs about $11.00 per sq ft.
The same building with 80-mil fully adhered TPO and a 30 year NDL warranty might add: $0.80 per sq ft for thicker membrane, $1.00 per sq ft for adhesive vs. fasteners and the additional labor, and roughly $0.20 per sq ft for the warranty premium and additional inspection requirements, putting total at about $11.00 per sq ft. The premium is real but the building has 10 more years of warranty coverage and substantially better wind performance.
On the worked example, the 80-mil adhered upgrade costs $2.00 per sq ft, or $60,000 on 30,000 sq ft. Spread over the 10 extra warranty years it buys, that is $6,000 a year; an owner planning a hold of 20 years or more can weigh that against the cost of one interior leak claim.
What contractor selection costs you (or saves you)
Manufacturer NDL warranties on TPO, whether 15, 20 or 30 years, are generally issued only when one of the maker’s authorized applicators installs the roof and the maker’s inspector accepts it. Ask each bidder which manufacturer inspection the warranty needs and whether its fee is in the price.
A bid from an unauthorized contractor can come in lower, but the roof is then backed only by that contractor’s own warranty.
The questions in our questions to ask a roofing contractor piece translate directly. The most useful for commercial: ask for the manufacturer authorization number, the exact warranty name and term (for example a 20-year NDL), and two recent NDL projects with the maker’s final inspection report, then call the manufacturer to confirm the authorization is current.
Roof access, building height, and site factors
Cost adders that show up at the walkthrough: crane days, billed per day, on buildings where membrane and insulation cannot be hoisted any other way, so ask for crane days as their own line. Fall protection: OSHA 29 CFR 1926.501 requires it for roofing work on low-slope roofs with unprotected edges 6 feet or more above a lower level, so warning lines, guardrail or a safety monitor are a real cost on every commercial reroof. Occupied buildings that cannot shut down push work to off-hours, which raises labor rates; ask the bidder to price it separately.
The economic case for TPO over alternative systems (EPDM, modified bitumen, BUR, metal) holds on most low-slope commercial buildings, but the specific install spec matters more than the membrane type. A poorly specified TPO install at $7 per sq ft is a worse buy than a properly specified modified bitumen roof at $9 per sq ft. The right answer is the spec that matches your wind zone, climate zone, hold period, and warranty preference, installed by an authorized contractor with documented quality control.
Small mixed-use buildings with pitched sections can take metal panels instead; see our metal roof installation guide.
If the existing membrane is sound, compare the reroof with our flat roof coating restoration and flat roof repair cost guides.
Tear-off vs. recover: how the existing roof affects price
The single largest cost variable that’s not on most bid sheets up front is what happens to the existing roof. A full tear-off (remove existing membrane, insulation, and any rotted decking down to deck level) adds $0.80 to $2.50 per sq ft depending on what’s being removed and disposal cost in your jurisdiction. A recover (new system over the existing roof) saves the tear-off cost but constrains the new spec, and the IBC reroofing provisions in Chapter 15 do not allow one over a roof that is water-soaked or deteriorated or that already has two or more applications of roof covering. Related: TPO commercial roof restoration.
Recover work also needs a moisture survey (infrared, nuclear or impedance scan, plus core cuts) of the existing roof. Wet insulation the survey finds has to come out, and widespread wet insulation turns a recover bid into a tear-off bid. On the 30,000 sq ft example, the $1.20 per sq ft tear-off line is $36,000, so carry it as a contingency until the survey is back.
Ask each manufacturer whether its maximum NDL term differs for a recover versus a tear-off on your spec. Where the recover term is shorter, part of the $1.20 per sq ft tear-off saving is offset, which matters most to owners holding the building 20 years or more.
TPO is a mature commercial roofing technology with a deep installer base and well-understood economics. The cost spread you’ll see in bids reflects real differences in what you’re buying, not negotiation noise. Read the spec sheets carefully, verify the contractor’s manufacturer authorization, and don’t optimize for the lowest per-square-foot price when the membrane has to perform for 25 years.
Which TPO spec fits your building
| If your building has | Spec to price | Planning cost per sq ft |
|---|---|---|
| Light foot traffic, inland wind exposure, budget-led owner | 60-mil mechanically attached | $7 to $9 |
| Coastal or Gulf-state wind zone, office or school | 60-mil fully adhered | $9 to $12 |
| Frequent rooftop equipment service or hail exposure | 80-mil (400 lbf vs 300 lbf minimum puncture per Carlisle) | $8 to $11 fastened; $10 to $14 adhered |
| A hold of 20 years or more and a need for the longest NDL | 80-mil fully adhered; confirm the maker’s maximum term | $10 to $14 |
| An existing ballasted roof designed for the load | Ballasted, wind design per ANSI/SPRI RP-4 | $5 to $8 |
| Two existing roof layers or wet insulation in the survey | Tear-off (IBC Chapter 15 reroofing rules) | Add $0.80 to $2.50 |
| A dead-flat deck | Tapered polyiso to at least 1/4:12 (IBC 1507.12.1) | Add 10% to 25% to insulation |
| Climate zone 4 to 6 under the 2018 IECC | R-30ci polyiso above the deck (about 5.2 in) | About $1.80 |
Frequently asked questions
How much does TPO roofing installation cost in 2026?
For most U.S. commercial projects, TPO roofing installs run about $7 to $14 per square foot in our planning ranges. Membrane thickness, attachment method, insulation R-value, cover board, and warranty term drive the spread. A 60-mil mechanically attached roof over R-25 with a basic warranty can land near $7.50, while 80-mil fully adhered over R-30 with a 30-year NDL warranty runs about $11.00 in our worked example and more with tapered insulation or a gravel tear-off.
How much does 60 mil TPO roofing cost?
In our planning ranges, 60-mil TPO runs $7 to $9 per square foot installed when mechanically attached and $9 to $12 fully adhered. HomeGuide (April 2024) lists 60 to 75 mil membrane systems at $2.20 to $3.10 per square foot fastened and $3.00 to $3.50 adhered for materials alone, before labor.
Is 60-mil or 80-mil TPO better?
80-mil resists punctures better: Carlisle’s Sure-Weld data sheet lists 400 lbf minimum puncture resistance for 80-mil against 300 lbf for 60-mil, and manufacturers commonly reserve longer warranty terms for 80-mil, which suits roofs with heavy foot traffic or hail exposure. 60-mil remains the cost-leader spec for warehouse, manufacturing, and big-box retail where traffic is light.
What is the difference between mechanically attached and fully adhered TPO?
Mechanically attached TPO uses fasteners and plates in the seam overlap and installs fastest, at about $7 to $9 per square foot for 60-mil. Fully adhered TPO is bonded with adhesive that adds about $0.70 to $1.20 per square foot in material, installs slower, and spreads uplift across the whole sheet, which is why it is common in coastal and Gulf-state wind zones. Attachment method also affects warranty terms and leak diagnosis.
How much insulation does a commercial TPO roof need?
The minimum comes from the energy code edition your jurisdiction adopted. Under the 2018 IECC, insulation entirely above the deck must reach R-25ci in climate zones 2 and 3 and R-30ci in zones 4 to 6. R-25 ISO runs about $1.50 per square foot, R-30 about $1.80, and R-38 about $2.30, with tapered systems adding 10 to 25 percent. Confirm the required R-value against your local code adoption.
Do I need a cover board under TPO?
A gypsum cover board such as Securock or DensDeck, at about $0.50 to $0.80 per square foot, adds hail and fire resistance and a stable substrate for adhesion. Omitting it is a common way bids come in cheaper, and manufacturers often reduce warranty terms and hail performance without it.
What does a typical 30,000 square foot TPO reroof cost breakdown look like?
A 60-mil mechanically attached roof over R-30 ISO with Securock and a 20-year NDL warranty runs about $9.00 per square foot, covering tear-off, insulation, cover board, membrane, fasteners, labor, accessories, and overhead. Upgrading to 80-mil fully adhered with a 30-year warranty pushes it to roughly $11.00.