What EPDM Roofing Work Involves, Step by Step
An EPDM roof replacement starts with a roof asset survey, not a sales pitch. We walk the membrane, mark every blister, open seam, and ponding low spot, then read the roof deck from underneath wherever the ceiling gives us access.
- A tear-off strips the old membrane, saturated insulation, and any roofing felt or tar paper still bonded to the substrate.
- A recover or overlay goes over dry, sound layers only when a moisture scan passes and the building code permits the added weight.
- Deck work replaces soft plywood, OSB, or sheathing, and rotted fascia, soffit, or eave boards get cut out and refit.
- Insulation and a vapor barrier go down before the sheet, because trapped moisture is what makes a new membrane peel early.
- The sheet is laid loose and fastened with plates and screws, or set in self-adhered adhesive where fasteners would puncture a fragile deck.
- Seams are cleaned, primed, and rolled with splice adhesive, and every lap gets hand-sealed so water cannot wick sideways.
Fastening matters more than owners expect. An overdriven nail or screw creates one puncture, and that puncture shows up as a drip two winters later.
Flat Roof Systems We Install, and Why We Pick Them
Low-slope roofing fails for different reasons, so we match the membrane to the building, the tenant load, and the budget you actually have.
- EPDM is a cured rubber sheet, and it handles UV and standing water better than most single-ply options on a flat rooftop.
- TPO is a heat-welded thermoplastic suited to retail and food service roofs with constant foot traffic.
- PVC membrane holds up near restaurant exhaust and chemical discharge, where lesser sheets chalk and oxidize.
- Modified bitumen is a torch-applied or self-adhered cap sheet that fits small residential flat roofs and porch overhangs.
- Built-up roofing, or BUR, layers hot asphalt and bitumen with roofing felt, and it still suits older buildings with gravel surfacing.
- Carlisle SynTec, Firestone, GAF EverGuard, Johns Manville, and Versico all manufacture sheet we install under warranty terms.
Warranty length tracks thickness and attachment. A fully adhered system can carry a 15 to 30 year no-dollar-limit membrane warranty, while a thin mechanically attached sheet will not. Waterproofing and weatherproofing details at the parapet, coping, and scupper decide whether a flat roof drains or sits.
Hiring a roofing contractor comes down to what gets probed and what gets written down. Any Santa Rosa roofing contractor can quote a number; a real roofer checks the joist and ridge beam framing behind it.
What We Inspect, and What Roof Failure Looks Like
A roof inspection is a slow walk with a probe, a moisture meter, and a camera. Here is what we look for, and what each finding means for your building.
- Blistering and alligatoring mean the surface has oxidized, and water is now seeping into the reinforcement.
- Open seams and split laps let water wick under the sheet, soaking insulation and corroding the steel deck.
- Ponding water that sits past 48 hours adds weight, spalls the surfacing, and erodes the lap sealant from the outside in.
- Delamination, chalking, and widespread cracking signal end-of-life wear, and a coating recoat buys a few seasons at most.
- Rotted decking, sagging rafters, and settled trusses often show as a dip in the roofline before they show up indoors.
- Failed pipe boots, vent boots, and pipe flashing let water past the curb, so a leak surfaces far from the actual damage.
Flashings carry most of the blame. We reset step flashing, counter-flashing, chimney flashing, and apron flashing, replace tired drip edge, and reseal with mastic or roof cement wherever a bead has cracked.
Steep-Slope Roofs and Residential Work We Also Handle
Not every call is a commercial flat roof. We mend and replace shingle, asphalt shingle, architectural shingle, and three-tab shingle roofs, plus wood shake and cedar shake, slate, clay tile, concrete tile, and metal panel.
- Standing-seam panel and corrugated panel cover barns, carports, and shops where a long panel run beats piecing shingles.
- Synthetic underlayment and ice-and-water shield sit under the field course, and an ice dam forms at the eave when attic heat melts snow above it.
- Ring-shank nails hold better than smooth shank on a steep pitch, and a starter course along the rake locks the first row down.
- We run staggered courses into the valley, cap the ridge with a ridge cap, and cut in a ridge vent plus soffit vent for real ventilation.
- Dormers, skylights, and chimneys get a flashing kit built for the penetration instead of a caulk bead smeared over a gap.
Attic heat drives most of this. A working attic fan and a clear soffit vent keep the deck cooler, and insulation pressed against the sheathing traps moisture. On a steep roof, the verge along the gable end takes wind first.
Local Conditions, Tools, and What Moves the Price
Fog and morning dew keep a rooftop wet well past sunrise, so we schedule membrane work into dry afternoon windows. Pacific storms are when emergency roof repair calls spike.
- Dry summers and wildfire risk make debris removal routine, so we clear needles and leaves from the gutter and downspout.
- Crews work off a ladder or scaffold with a safety harness clipped to an anchor, and tear-off debris goes straight into a dumpster.
- A pry bar and roofing shovel strip layers fast, while a roofing square, nail gun, and air compressor keep courses straight.
- Purlin, batten, and counterbatten framing on older outbuildings changes how a new sheet anchors to the substrate.
- Hip, gable, mansard, and gambrel roofs shed water differently, and a canopy, awning, or overhang leak is usually flashing, not sheet.
- Snow guards belong in mountain country, and we tell you plainly when a product does not fit Sonoma County weather.
A roof estimate reflects square footage, tear-off layers, deck repair, and access. A flat commercial recover takes days; a full tear-off with new insulation and flashing runs longer, and we say so before you sign.
