For most California warehouses and offices, white TPO is the usual pick: it is heat welded, reflective and costs less than PVC. Choose PVC where grease, oils or chemicals reach the roof, as at food plants and kitchen exhausts. EPDM suits cold climates, but standard black EPDM will not meet California’s low-slope cool roof minimums.
If you have three roof bids naming three different membranes, this guide will help you compare them. It covers what each one is, how they handle grease, heat and foot traffic, what California’s cool roof rules require on a reroof, and what warranty terms to ask for.
OneRoof Solution has installed and repaired commercial and industrial roofs across California since 2008 (CA License #930054), from offices in Napa and Visalia. We install and repair all common commercial roof systems, most often TPO and PVC roofing systems. We are certified or authorized applicators for Carlisle, GAF, Duro-Last, Versico, Henry, CertainTeed and American Standard Coatings. We work on commercial buildings only.
The three membranes in plain terms
All three are “single-ply” roofs: one large sheet of membrane that covers a flat or low-slope roof.
- TPO (thermoplastic polyolefin). A white, tan or gray sheet whose seams are welded with hot air. Carlisle describes its Sure-Weld TPO as combining the flexibility of rubber with the heat weldability of polypropylene. Carlisle’s white and tan TPO are ENERGY STAR qualified, and Carlisle describes them as California Title 24 compliant (Carlisle Sure-Weld TPO data sheet). The standard is ASTM D6878 (ASTM).
- PVC (polyvinyl chloride). Also heat welded at the seams into one piece. Known for resisting fats, oils and chemicals. The standard is ASTM D4434, and Carlisle says its Sure-Flex PVC is Type IV, the strongest rating in that standard (Carlisle; ASTM).
- EPDM (synthetic rubber). A rubber sheet, black as standard, with white and gray versions. Seams are joined with tape or adhesive, not welded. The standard is ASTM D4637 (ASTM; Carlisle Sure-Seal EPDM).
How to tell TPO from PVC on your roof
They can look almost the same. The safe way to know is from paperwork, not by cutting or burning a sample:
- Check the original roof records, drawings or submittals.
- Look at the manufacturer warranty certificate. It names the system.
- Look for a manufacturer label or printing on the sheet edge or roll wrap left on site.
- Ask your roofer. A trained crew can tell during an inspection.
Side-by-side comparison
Every cell below comes from manufacturer documents, IIBEC or California’s Energy Code. Where we do not have a sourced fact, we say so.
| TPO | PVC | EPDM | |
|---|---|---|---|
| What it is | Thermoplastic sheet | Thermoplastic sheet | Synthetic rubber sheet |
| Seams | Hot air welded into one piece | Hot air welded into one piece | Tape or adhesive |
| Grease, fats and oils | Carlisle lists “excellent chemical resistance to acids, bases and restaurant exhaust emissions” | Carlisle says PVC offers superior resistance to animal fats, greases and oils compared with other single-ply sheets | No sourced claim. Ask the manufacturer |
| Color and reflectivity | White and tan are ENERGY STAR qualified (Carlisle) | White available. Check the product’s CRRC listing | Black standard. Carlisle’s Cool Gray EPDM lists aged SRI 47 (interim rating) |
| Fits Title 24 low-slope minimum? | White products often do. Check the CRRC listing | White products may. Check the CRRC listing | Black and gray generally do not without an exception or trade-off |
| Fire | Check the system’s fire rating | Carlisle says it self-extinguishes when the flame source is removed | Check the system’s fire rating |
| Electronic leak testing later | Can be tested if the deck setup allows | Can be tested if the deck setup allows | Black EPDM cannot be tested accurately with standard methods (IIBEC) |
| Relative installed cost | Lower than PVC (compare bids on the same scope) | Higher than TPO | Varies. Compare bids on the same scope |
| Standard | ASTM D6878 | ASTM D4434 | ASTM D4637 |
Cost depends on your roof, so we quote every roof after we see it.
Where PVC earns its higher price: grease, oils and chemicals
Kitchen exhaust fans and some process vents put fats, greases and oils onto the roof. Carlisle says many common roofing materials can be damaged or destroyed by these, and that compared with other single-ply sheets, PVC offers superior resistance to animal fats, chemicals, greases and oils. Carlisle also says PVC will self-extinguish when the flame source is removed, which matters where grease fires are a risk (Carlisle PVC for restaurants; Sure-Flex PVC sell sheet).
Here is the part many roofing sites leave out. Carlisle’s own TPO data sheet lists “excellent chemical resistance to acids, bases and restaurant exhaust emissions.” So TPO is not ruled out near every exhaust. The honest answer: PVC is the safer default where fats and oils build up on the roof. For your exact exhaust or process, ask the manufacturer to confirm in writing that the membrane is compatible.
Food processing, dairy and cold storage roofs
Food plants are hard on roofs. Process exhaust, washdown chemicals and heavy rooftop equipment with regular service traffic all add wear. The right membrane depends on what actually lands on your roof, and where. That is why we look at the exhaust and equipment areas before we recommend a membrane.
A real example. At the Saputo cheese plant in Tulare, we removed and replaced a mechanically attached Carlisle 60 mil TPO membrane and slip sheet over the existing insulation and steel deck on about 80,000 sq ft, to weatherproof a new brine conveyance system (see the project).
Heat, reflectivity and California’s cool roof rules
Under California’s 2025 Energy Code (Title 24, Part 6, in effect since January 1, 2026), Section 141.0(b)2B says cool roof rules apply when a nonresidential roof is replaced, recovered or recoated over more than 50% of the roof area or more than 2,000 sq ft, whichever is less (California Energy Commission; Energy Code Ace, Section 141.0). Almost every full reroof crosses that line.
For low-slope roofs (less than 2:12), the roofing product needs either:
- a 3-year aged solar reflectance of 0.63 or more and a thermal emittance of 0.75 or more, or
- a Solar Reflectance Index (SRI) of 75 or more.
That applies in every California climate zone (CRRC 2025 Energy Code summary). “Aged” means how well the roof still reflects sunlight after three years outdoors. The code lists exceptions: a lower aged reflectance is allowed if the roof meets the maximum insulation U-factor in Table 141.0-B, roof area under built-in solar panels is exempt, and so are roofs carrying at least 25 lb per sq ft. A replacement or recover that crosses the trigger must also meet the insulation levels in Table 141.0-C, with some listed exceptions.
Roofing products must be rated and labeled by the Cool Roof Rating Council (CRRC), and compliance is documented on the NRCC-ENV form. Per the CEC, alterations to the roof of an unconditioned building do not trigger the cool roof rules, which can matter for some warehouses.
A real example with real numbers. Carlisle’s Sure-Seal Cool Gray EPDM lists an initial solar reflectance of 0.48, a 3-year aged reflectance of 0.42 and an aged SRI of 47. Carlisle marks these as interim rapid rating values (Carlisle Cool Gray EPDM data). Both are below the low-slope minimums above, so a gray EPDM reroof would need an exception or trade-off to comply.
What to do with your bids: for every membrane named, ask for the exact product and look up its aged values in the CRRC Rated Products Directory. White TPO, white PVC and white EPDM all exist, but each product has its own rating.
Some national roofing sites quote ASHRAE or ENERGY STAR numbers. In California, reroofs follow Title 24 Part 6.
Seams, repairs and what that means for leaks later
TPO and PVC seams are welded with hot air, so the sheets fuse into one piece. EPDM seams depend on tape and primer or adhesive.
Membrane choice also affects how easy it is to find leaks later. IIBEC notes that electronic leak detection and impedance moisture scans cannot accurately test EPDM or other membranes with conductive materials (IIBEC). That can make tracing a future leak on an EPDM roof harder. See our guide to commercial roof leak detection.
Lifespan and warranty: what you can actually count on
Blog lifespans vary a lot and are rarely sourced. Warranty terms are a better planning number, because a manufacturer puts them in writing.
- PVC: Carlisle’s restaurant sheet lists PVC warranties from 5 to 30 years, depending on the system, and says its Total System Warranties are No Dollar Limit (Carlisle).
- TPO and EPDM: manufacturers offer different terms by system and sheet thickness. Ask for the exact term, and who issues it, in writing.
When we quote a roof, we spell out the warranty options for that system. A warranty only holds up if the roof is cared for. Carlisle’s Golden Seal warranty can be voided by unapproved repairs or rooftop additions, or by the owner not using reasonable care in maintaining the roof. Its care guide asks for inspections at least every six months and after severe weather (Carlisle warranty PDF). Our Rainshield Roof Care Program helps you keep your warranty valid with scheduled maintenance.
Quick picker: which membrane for which building
- Warehouse or distribution center with a big, simple roof in hot Central Valley sun: usually white TPO.
- Food plant, restaurant tenant, or process exhaust and oils on the roof: usually PVC. Get the manufacturer to confirm it suits your exhaust.
- Building with existing EPDM in good shape: repair it, or look at recover options. Check the Title 24 trigger first, since a large recover or replacement must meet cool roof rules.
- Old torch down or mod bit roof: see TPO vs modified bitumen.
- Recovering over an existing roof: ask about compatibility and cover board. Some materials, like EPDM and asphalt products, do not mix. Your roofer should check.
- Data center or office with tight access and noise limits: the attachment method and work schedule matter as much as the membrane. Ask each bidder how they will keep your operation running.
Real ORS single-ply projects
From our single-ply projects and project records.
- New construction, Visalia industrial office: 2 inch ISO insulation with 60 mil Carlisle TPO, 27,000 sq ft.
- Reroof, Richmond industrial facility: tore off 65,000 sq ft, then installed fully adhered DensDeck Prime cover board and Carlisle 115 mil FleeceBACK TPO. The project page lists 130,000 sq ft.
- Reroof, American Inc. office and shop, Visalia: tore off the old gravel built-up roof. Installed a FiberTite fleece-back membrane on about 75,000 sq ft and a Carlisle fluid applied acrylic restoration system on about 25,000 sq ft, 100,000 sq ft in all.
- Reroof, Los Altos office: removed a spray foam roof down to the concrete deck and installed tapered insulation and Carlisle 135 mil FleeceBack TPO, about 14,500 sq ft, while the tenant kept working.
- Food plant, Tulare: the Saputo TPO replacement described above, about 80,000 sq ft.
FAQ
Is PVC better than TPO?
It depends on the roof. PVC is the safer pick where fats, oils or chemicals reach the roof. On most warehouses and offices without that exposure, white TPO does the job and costs less.
Is TPO better than EPDM?
For most California buildings, yes. White TPO is heat welded and reflective, which helps it meet Title 24 cool roof rules. Standard black EPDM does not meet the low-slope minimums without an exception or trade-off.
Which roof membrane is best for a food processing plant?
Often PVC, because of its resistance to fats, greases and oils. But it depends on what lands on your roof and where. Ask the manufacturer to confirm compatibility with your exhaust or process.
How long does a TPO roof last?
Plan on the warranty term, not a blog number. Manufacturers offer TPO warranties of different lengths depending on the system and thickness, and regular maintenance keeps them valid.
How long does a PVC roof last?
Again, use the warranty term. Carlisle lists PVC warranties from 5 to 30 years, depending on the system. Regular maintenance keeps that warranty valid.
Does a white TPO roof meet California Title 24 cool roof rules?
Many do, but it depends on the exact product. Look up its 3-year aged solar reflectance, thermal emittance or SRI in the CRRC directory. For low-slope roofs the code requires aged reflectance 0.63 and emittance 0.75, or SRI 75.
Can you put TPO over an old EPDM or built-up roof?
Often, as a recover, if the old roof is dry and sound. Wet insulation has to come out first, and some materials need a separator or cover board. A large recover also triggers Title 24 cool roof and insulation rules.
How can I tell if my roof is TPO or PVC?
Check the roof records, the warranty certificate or any manufacturer label. Or ask your roofer to check during an inspection. Do not cut or burn a sample.
Comparing roof bids?
Send us your bids or book a roof assessment. We will tell you which membrane fits your building, your process and Title 24, in plain words.
Call (855) 762-7663, or (707) 440-2351 for our Napa office, or email sales@1roofsolution.com. For a roof emergency, call our 24/7 line at (559) 697-6252.
Already have a single-ply roof? Keep your warranty valid with Rainshield inspections.