| TPO installed cost | About $4.50–$16 per sq ft |
|---|---|
| Cool roof (CZ12) | Reflectance 0.63+ on most reroofs |
| Common problems | Ponding, seam failure, blisters |
| Options | Repair, coat or replace |
| Maintenance plans | Twice-yearly inspection |
What does a TPO roof cost?
TPO single-ply membrane typically costs about $4.50–$16 per square foot installed. (Source: Angi) The range depends on insulation thickness, tear-off, the number of rooftop units and drains, and access.
Do flat roofs need to be cool roofs in California?
In most cases, yes. When 50% or more of a low-slope roof is replaced in Climate Zone 12 (all of our service area), the product needs an aged solar reflectance of at least 0.63 and thermal emittance of at least 0.75, or an SRI of 75, unless the roof deck is insulated to the code's alternative values. Low-slope replacements also trigger insulation requirements. White TPO meets the reflectance rule; dark membranes and gravel roofs usually don't. (Source: Cool Roof Rating Council, BayREN)
Why does my flat roof pond water?
Ponding means water can't reach a drain within about 48 hours of rain, usually because of sagging decking, blocked drains or too little slope. Standing water speeds up membrane aging and finds every weak seam. The fix ranges from clearing drains to adding tapered insulation so the roof drains properly.
Repair, coat or replace?
| Option | When it fits |
|---|---|
| Repair | Isolated seam failures, punctures or flashing problems on a sound roof |
| Coating | Membrane is aged but dry underneath; extends life and adds reflectivity |
| Replacement | Wet insulation, widespread blistering, or ponding that needs re-sloping |
We core-sample or moisture-scan before recommending a coating, because coating over wet insulation traps the problem.
Where we provide flat & commercial roofing
We serve homes and businesses within 50 miles of Modesto, including Modesto, Ceres, Riverbank, Salida, Oakdale, Turlock, Patterson, Manteca, Tracy, Stockton. See all service areas.