TPO, short for thermoplastic polyolefin, is a single-ply membrane heat-welded into one continuous sheet across a low-slope roof deck. For Concord property managers, it replaces a built-up roof or modified bitumen system that has been ponding water all winter.
Start with a roof asset survey. We walk the rooftop, check the pitch toward every drain and scupper, and test the substrate for moisture before quoting a recover or a full tear-off. Wet insulation comes out either way.
Concord's hot, dry summers with occasional fire season winds bake a dark membrane until it flakes and oxidizes; winter rain with occasional heavy downpours finds every failed seam. Moderate temperature swings between seasons work the flashing at parapets and curbs until the sealant peels.
Moisture scanning is where roofing technology earns its keep. An infrared scan shows wet insulation as a temperature difference on the rooftop, so we open only the sections that need it instead of tearing off a sound roof.
A white TPO membrane reflects sunlight instead of soaking it up, which lowers the cooling load on a building with tenants working underneath. Rigid insulation and a soffit vent or attic fan detail push the same roof toward real energy efficiency.
- The membrane itself, a TPO or PVC single-ply sheet, with EPDM as the rubber alternative when a building owner wants the longest track record.
- A recover over a sound built-up roof or modified bitumen cap sheet, which skips the tear-off, the dumpster, and most of the landfill weight.
- Fully adhered sheets or mechanically fastened panels held with screws and plates, plus synthetic underlayment and self-adhered ice-and-water shield at the perimeter where wind uplift is worst.
- Rigid insulation board over the deck to raise the R-value, plus a vapor barrier in buildings with high interior humidity.
- New flashing at every penetration: pipe flashing and pipe boots at vents, chimney flashing, step flashing, and counter-flashing at walls.
- Fresh drip edge along the eave and rake, with the gutter, downspout, soffit, and fascia checked while the ladder is still up.
- Scuppers, drains, and coping re-pitched and reset so rainwater leaves the rooftop instead of ponding at the low corner all winter.
- Where a client wants stormwater control, a green roofing assembly can sit over the membrane if the structure carries the soil load.
- Mastic, roof cement, and caulk at every termination, with a sealant bead on the metal edge and adhesive at the curb details.
- Snow guards are rarely needed here, but we do set anchor points so a technician can tie off rather than lean a ladder against a gutter.
On older Concord buildings we still pull up hot-mopped tar and gravel, roofing felt, and tar paper laid over decades of asphalt, bitumen, and pitch. That is what a recover hides, and it is why we test the substrate before quoting.
Where a pitched roof ties into the flat membrane, we run ice-and-water shield up the valley and past the hip so an ice dam cannot wick water sideways under the shingles.
Ridge caps and ridge vents get replaced on the sloped run, and any dormer or skylight comes out for new boot flashing and apron flashing.
TPO is the wrong call on a steep pitch. Concord's 1960s and 1970s ranch-style homes and mid-century tract homes carry pitched roofs covered in asphalt shingle, architectural shingle, or three-tab shingle, and we service those with shingle roofing instead.
Wood shake, cedar shake, slate, clay tile, concrete tile, and standing-seam metal panels each have their own repair path. Tile and metal sit on battens or counterbattens above the deck, and every standing-seam panel on purlins gets a fastener check.
TPO belongs on the flat sections: porch roofs, canopies, awnings, mansard and gambrel lower slopes, and carriage-house overhangs. A corrugated panel or older metal roof over a shed is a different job again.
Tools matter less than sequence. On a Concord rooftop the crew works off scaffold or ladder with a safety harness, and sets the first line with a roofing square.
A nail gun fed by an air compressor drives the fasteners; a pry bar and roofing shovel break down the tear-off. A torch only comes out on torch-down systems, kept clear of occupied space.
A reflective coating over an older BUR buys a few years of waterproofing and weatherproofing, but it will not rescue saturated insulation. We check building code requirements for edge metal and fire classification before the permit goes in, and we schedule around your tenants.
- Free roof inspection and roof estimate: we photograph the rooftop and price the work in writing.
- Roof asset survey: pitch, flashing condition, drain layout, and a moisture scan of the insulation.
- Tear-off or recover decision, dumpster set, and debris hauled the same week.
- Deck repair: soft plywood or OSB sheathing and rotted decking come out, and we check trusses, rafters, joists, and the ridge beam while it is open.
- Membrane install: insulation board, field course sheets, heat-welded laps, then the details.
- Final inspection with seams probed by hand, plus warranty paperwork before we leave.
We have worked as a roofing contractor in Concord since 1988, and every roofer on the crew has been up on a flat roof like yours before. Some of the membranes we welded that first year are the ones we are re-covering now.
East Bay Roofers covers Downtown Concord, Willow Pass, Meadow Homes, Lime Ridge, and Concord Hills, from storefronts near Todos Santos Plaza to warehouse roofs by the Walnut Creek Staging Area. You can usually see Mount Diablo from the ladder.
We inspect the roofline from the street before we pack up, so what you see from the driveway matches what we probed on top. Customer satisfaction here means you can check the seams yourself.
Commercial TPO warranties typically run 15 to 30 years NDL, and we back our labor with a 10-year workmanship warranty on top of up to 50-year manufacturer coverage. Call (925) 722-4916 for a free roof estimate.
