Metal roofing
Architectural shingles
Tile roofing
GAF
Owens Corning
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
GAF Roofing in San Francisco, CA
We provide independent GAF roofing service across San Francisco, and the one thing that sets our GAF work apart here is that we diagnose the roof assembly, not just the top layer. In a city of Victorian and Edwardian row houses packed against shared party walls, a GAF roof can look sound from the street and still be failing underneath. That gap between appearance and reality is where we spend most of our time on San Francisco roofs.
We work on GAF asphalt shingle systems and GAF low-slope membranes with quality parts that fit what’s already on your roof. We’re an independent contractor. We’re not affiliated with GAF, not a GAF dealer, and not authorized by the manufacturer. Call (855) 473-8840 to schedule a free estimate.
Why San Francisco Residents Choose Us for GAF Service
We know the GAF systems on San Francisco homes because we service them regularly. That means we recognize how Timberline architectural shingles age under persistent fog, and we know where a Liberty membrane tends to let go at the perimeter. Familiarity with a product line is worth something concrete when your roof is leaking.
We also choose parts that fit the existing system rather than whatever’s easiest to source. GAF-branded sealant, starter strips, ridge caps and Liberty membrane go on where they match. Quality aftermarket flashing and vent boots go on when a GAF equivalent isn’t available or costs more than the job warrants. The roof doesn’t care whose logo is on the boot. It cares that the boot seals.
Scheduling works around you. We answer 24/7, and we dispatch Sunday through Friday from 7am to 7pm. Our technicians have up to 12 years of experience, and every job starts with a free written estimate so you know the scope before anyone climbs up. We’re closed Saturday.
Styles & brands we work with
- Architectural shingles
- Metal roofing
- Tile roofing
- GAF
- Owens Corning
- Flat & low-slope
Common GAF Roofing Problems We Solve in San Francisco
These are the GAF failures we run into most on San Francisco roofs, and what usually drives each one.
- Granule loss and mat cracking on Timberline HDZ. On foggy west-side roofs, these shingles shed granules and develop cracking in the mat from sustained damp. North-facing slopes are the worst, because moss holds moisture tight against the sealant strips long after the fog lifts elsewhere.
- Liberty membrane wrinkling and debonding at the edges. When a self-adhered GAF Liberty membrane goes over an old tar-and-gravel overbuild, trapped moisture in the original assembly pushes up during the rainy season and lifts the perimeter. The new layer looks fine in July and peels at the edge in January.
- UHDZ blistering and curling at the ridge. On steep Victorian gables, premium Timberline UHDZ shingles can blister and curl at the ridge when attic ventilation is inadequate. This shows up often where original redwood shingles were overlaid without adding intake vents.
- EverGuard TPO seam and boot failures. Small flat penthouses in the Avenues take constant condensation from the marine layer plus daily thermal cycling. Seam welds and pipe boots are the first to go, and the leak shows up in the ceiling cavity well away from the actual breach.
- Failed step flashing and sealant strip at chimneys and skylights. San Francisco’s rainy season from November through March finds every weak flashing detail. A leak that only appears in winter is almost always a flashing or sealant-strip problem, not a shingle problem.
GAF Service in San Francisco: What Local Conditions Mean for Your Project
Here’s the local fact that changes how we work on GAF roofs in San Francisco. In the Sunset and Richmond districts, the west-side fog keeps Timberline shingles damp enough that moss and rot often start on the underside of the shingle mat, not the face. A roof can look intact from the street and have failed sealant strips and soft decking beneath the first course. That’s why our inspection doesn’t stop at the surface. We check the underside, the deck, and the first course where moisture collects, because on a fog-belt San Francisco roof the visible layer is the least reliable evidence you have. Sun exposure east of Twin Peaks changes the picture – warmer, drier conditions there mean shingle aging looks more conventional, while the Avenues and outer Richmond hide their problems below.
GAF Models & Products We Service in San Francisco
We install, repair and service GAF Timberline HDZ and Timberline UHDZ architectural asphalt shingles, GAF Liberty self-adhered low-slope membrane, and GAF EverGuard TPO flat roofing membrane. Those four cover most of the GAF work on San Francisco homes, from steep Victorian gables to small flat penthouses.
Matching parts to the existing system matters. When the roof has GAF accessories, we use GAF accessories that fit. When a GAF vent boot or flashing piece isn’t available or is priced above a quality aftermarket equivalent, we use the equivalent. We repair isolated flashing and vent-boot failures where the rest of the GAF roof is sound. We recommend replacement when the shingle mat is cracked across multiple slopes or the underlayment has failed from below.
See the difference
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AfterGAF Service Pricing in San Francisco
Pricing is per job, set by a free written estimate after we’ve seen the roof. We don’t publish rates because a San Francisco GAF repair and a San Francisco GAF replacement aren’t the same job, and the variables here are real.
- Scope of the failure. A single vent boot costs a fraction of a chimney flashing rebuild.
- Roof access. Dense row-house construction with shared party walls sometimes means staging through a neighboring property, which affects labor.
- Hidden conditions. Underside rot and failed decking in the fog belt aren’t visible until the shingles come up.
- Material choice. Match-and-repair with HDZ versus a UHDZ upgrade changes the material line.
- Ventilation correction. Ridge and intake vent work on a steep Victorian gable adds scope.
Every estimate is written line by line so you can see what you’re paying for. Call (855) 473-8840 for an exact quote. Estimates are free.
Serving San Francisco, CA – Our Local Coverage Area
We serve San Francisco and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs – GAF Roofing in San Francisco
Because west-side fog lets moss and rot start on the underside of the shingle mat, not the face, so the roof reads as intact from the street while the sealant strips and decking below have already failed. Winter rain then finds the opening. A proper inspection checks the underside and the first course. Call (855) 473-8840 for a free estimate.
Yes, often. Liberty membrane over an old tar-and-gravel assembly tends to wrinkle and debond at the perimeter when trapped moisture pushes up during the rainy season, and that edge failure can usually be cut back and re-sealed without a full tear-off. If the trapped moisture is widespread, a repair won’t hold. Call (855) 473-8840 and we’ll give you a straight answer on which one you’re looking at.
They do, because party-wall flashing continuity and firewall detailing come before anything cosmetic on a San Francisco row house. On steep gables, attic ventilation also has to be built in, since curled UHDZ at the ridge usually traces back to missing intake vents. We handle the installation details and pull permits where the city requires them. Call (855) 473-8840 to schedule a free estimate.
Inadequate attic ventilation, most often, especially where original redwood shingles were overlaid without adding intake vents. Heat builds under the deck, the shingle blisters and the ridge course lifts. Targeted repair plus vent correction usually beats a full tear-off. Call (855) 473-8840 for an exact quote.
It can be. EverGuard TPO handles the constant condensation and thermal cycling of a small flat roof well when the seams and boots are done right, and those are exactly the points that fail first when they aren’t. We inspect and repair seam welds and pipe boots on existing TPO, and we install new membrane where the assembly is beyond patching. Call (855) 473-8840 to talk through your roof.
Service Areas Near San Francisco
Alongside our work in San Francisco, we serve homeowners in San Francisco-area communities including Fremont, Mountain View, San Jose, Sunnyvale and Santa Clara. If your GAF roof sits anywhere in the region and you’re not sure whether we cover it, call and ask. If you want the details on GAF systems generally, our GAF page covers the product lines we work with.
Book Your GAF Service in San Francisco Today
Whether you’re chasing a winter leak or want a real read on the condition of your roof, we’ll tell you exactly what your roof needs – repair, replacement, or nothing at all. The estimate is free and written line by line. Call (855) 473-8840. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Written by the team at Sunstone Roof Repair.