TPO & Single-Ply Roofing in Stockton
TPO, PVC and EPDM membranes on low-slope commercial roofs: how they’re installed and what they cost.
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Basics
What single-ply roofs are
TPO and single-ply roofing in Stockton covers three common membranes. TPO and PVC are usually white sheets with heat-welded seams. EPDM is a rubber sheet, often black, with seams joined by tape or adhesive.
The membrane can be mechanically fastened, fully adhered or held down with ballast. Each method changes the insulation, the wind rating and the price.
Seams are the weak point of any membrane. A good crew probes every welded seam before leaving the roof.
Problems
Common problems on older membranes
- Seams that split or were never fully welded.
- Shrinking EPDM pulling at the edges and corners.
- Punctures from foot traffic around rooftop units.
- Flashing pulling away at curbs and parapets.
Small punctures and seam gaps can be patched. Widespread seam failure usually points to replacement.
Attachment
Attachment methods compared
- Mechanically fastened: the membrane is screwed down through plates at the seams. Common and usually lower cost.
- Fully adhered: the membrane is glued to the insulation or cover board. Smoother look and fewer flutter problems in wind.
- Ballasted: loose-laid and held down with stone or pavers. Needs a deck that can carry the weight.
Ask the roofer which method the manufacturer warranty requires for your building height and wind exposure.
Local
Local factors that change a membrane job
| Local factor | What applies in Stockton | How it affects the job or price |
|---|---|---|
| Reflectance | The CEC asks low-slope roofs for an aged solar reflectance of 0.63 and emittance of 0.75, or an SRI of 75, when the cool roof rule applies. | White TPO and PVC usually qualify; check the CRRC rating on the exact product. |
| Unconditioned buildings | The CEC says roof alterations on unconditioned buildings don’t trigger cool roof rules. | An unheated warehouse may have more membrane options. |
| Recover insulation | The CEC’s 2022 manual set at least R-10 for recovers, or the replacement value if less. | Insulation thickness drives curb and flashing work and cost. |
| Climate zone | The CEC climate zone lookup sets which code tables apply to your address. | The zone decides the insulation and reflectance numbers on the bid. |
| Fall protection | Cal/OSHA §1730 calls for warning lines at least 5 feet from the edge on low-slope roofs higher than 20 feet. | Edge setup is part of the labor price on taller buildings. |
Cost
What TPO costs
HomeAdvisor’s 2025 guide lists TPO at $4 to $14 per square foot, about $8.75 on average, and EPDM at $4 to $13. Fixr’s 2026 guide lists PVC at $5 to $16.
The Fixr TPO article says larger, simpler roofs generally cost less per square foot. A big open warehouse roof often prices lower per foot than a small roof full of equipment.
Equipment
Solar and rooftop equipment
White membranes reflect heat, but the roof under solar racks and units still needs care. Ask for walk pads on service routes and for curbs high enough for the new insulation.
Warranties
Membrane warranties range from material-only coverage to manufacturer warranties that cover labor and materials for leaks. The longer ones usually require an approved installer, an inspection by the manufacturer and regular upkeep. Ask for a sample warranty before you sign.
Ask
Questions to ask a roofer
- Which membrane, thickness and attachment method do you recommend, and why?
- Is the product CRRC rated, and does our building need it to be?
- How will you test the welded seams before you leave?
- Will you add walk pads around rooftop units?
- Can I see photos of the seams, curbs and drains when you finish?
What to mention when you call
Current roof type and age, roof size, rooftop units and solar, whether the building is cooled, and any warranty paperwork from the last roof.
Next
Related pages
Related roof work
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