What TPO is and why it fits the Central Valley
TPO stands for thermoplastic polyolefin — a single-ply roofing membrane rolled out across a low-slope or flat roof. Its white, reflective surface bounces the valley's intense summer sun, which keeps the building cooler, lowers air-conditioning bills, and meets California Title 24 Part 6 cool-roof requirements for Climate Zone 12.
The membrane's seams are fused with hot air, not glued or taped. That heat-weld turns the whole roof into one continuous, watertight surface and is the single biggest reason a well-installed TPO roof resists leaks for decades.
How DeHart installs TPO
We install TPO in 45, 60, and 80 mil thicknesses, going heavier for high-traffic or hail-exposed roofs. Depending on the building and its wind exposure, the membrane is mechanically fastened or fully adhered.
Every job starts with tear-off and a deck inspection, then new cover board or insulation where it's needed, the membrane, heat-welded seams, and flashed penetrations. You get a flat-rate written bid up front, and we file the CRRC and Title 24 documentation at closeout.
TPO warranty coverage
Manufacturer membrane warranties on TPO typically run 15 to 30 years, depending on thickness and system. DeHart backs the installation itself. A correctly welded, properly flashed TPO roof is a long-term, low-maintenance system — see our roofing warranty page for how manufacturer and workmanship coverage stack.
Buildings we install TPO on
TPO works on almost any low-slope or flat roof: warehouses, retail centers, offices, churches, and agricultural and industrial buildings, plus apartment and multi-family properties. For the full system lineup and pricing, see our commercial roofing page or the Central Valley commercial systems comparison.