Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Why San Francisco Homeowners Choose GAF Construction
Bradford Remodeling Co provides San Francisco Gaf service including independent GAF roofing repair, replacement, and gutter work across the city, from the fog-heavy avenues of the Outer Sunset to the steep slopes of Noe Valley. We work on GAF Timberline HDZ and UHDZ shingle roofs, EverGuard TPO low-slope systems, StormGuard underlayment, and Cobra Ridge Vent, and we keep our pricing in writing before any work starts. We are not affiliated with or authorized by GAF, which means we give homeowners a straight assessment of what a GAF roof will do in San Francisco, not a manufacturer’s marketing pitch. Call (831) 610-5598 for a free estimate.
What makes our GAF work different is simple: we know how these products actually behave here. Fog, eucalyptus debris, salt air, and 100-year-old framing do things to a roof that a spec sheet never mentions. We have torn off enough failed GAF installations in the Richmond, Sunset, and Mission districts to know exactly where these systems hold and where they break. Curtis Lane, our owner, keeps a worn copy of the California Building Code on his desk, and he applies that same discipline to every GAF tear-off, repair, and re-roof we run.
Why Trust Bradford Remodeling Co San Francisco for Your GAF Construction?
GAF makes solid roofing products. But a roof only performs as well as the crew that lays it and the flashing, underlayment, and ventilation details around it. Our technicians have installed and repaired GAF systems across San Francisco for years, and they know the difference between a product defect and an installation failure. That distinction matters, because it changes whether the repair is a small section replacement or a full tear-off, and it changes the number on your written quote.
Curtis Lane grew up in Los Angeles and picked up his first framing hammer before he had a driver’s license. He completed his construction technology training at Los Angeles Trade-Technical College, where he learned to read structural drawings and run a proper material takeoff. Over the past two decades he and his crew have worked throughout San Francisco, including a stretch of gut-and-rebuild projects in the Outer Sunset that taught him exactly how fog-driven moisture moves through older balloon-frame walls. That experience transfers directly to roof work: he knows how moisture moves through a roof system in this city, and he trains his crews to look for it.
Every GAF project we take on gets the same treatment. Written price before work starts. Scope in writing. Clean site at close-out. A signed 365-Day Done Right Promise in your hand. Straight number, real scope, no surprises at close-out.
Styles & brands we work with
Common GAF Construction Problems We Fix in San Francisco
- Timberline HDZ granule loss and curling on north-facing slopes. On the foggy north sides of homes in the Avenues, GAF Timberline HDZ shingles stay damp for months at a time. Moss takes hold, granules shed, and shingle edges curl upward. The failure is not always the shingle itself. Often the roof lacked proper intake ventilation, or the deck was re-sheathed without a drainage plane. We fix the shingles and correct the ventilation so the replacement does not fail the same way.
- EverGuard TPO seam separation on low-slope roofs near the coast. Salt air and persistent marine layer moisture attack heat-welded TPO seams. If the original installer skipped primer or welded at the wrong temperature, the seam delaminates and water finds the penetrations. We cut out the failed section, re-weld with proper primer and heat settings, and check every penetration on the roof, because one bad seam usually means others are not far behind.
- Roof deck rot under multiple layers of old GAF shingles. San Francisco’s Victorians and Edwardians often carry two or three layers of asphalt shingles over original skip sheathing. The top layer looks tired but serviceable. Underneath, trapped moisture has turned sections of the deck to sponge. A tear-off reveals what no inspection can. We re-sheath rotted sections, install new underlayment, and re-roof to current code, including seismic fastening where the building department requires it.
- StormGuard underlayment tearing at eaves from clogged gutters. Eucalyptus debris from trees in Golden Gate Park and throughout the western neighborhoods plugs gutters fast. Water backs up over the eave line, sits against the StormGuard underlayment, and eventually tears it. The telltale sign is staining on the fascia and water intrusion at the top of exterior walls. We replace the damaged underlayment, add a proper drip edge, and install gutter protection where it makes sense.
- Cobra Ridge Vent failures caused by improper fastening. Ridge vent is a common point of failure on shingle roofs in San Francisco because high winds at ridgelines work fasteners loose. A GAF Cobra Ridge Vent that lifts lets driving rain straight into the attic. We re-set the vent with correct fasteners, verify the open slot is properly cut along the ridge, and seal any gaps that were left by the original installer.
GAF Parts & Our Repair-vs-Replace Approach
We use genuine GAF accessories when the repair calls for it: StormGuard underlayment, Shingle-Mate felt, Cobra Ridge Vent, and matching Timberline shingle profiles. If your existing roof has a specific GAF color blend, matching it matters, and we will track down the right run rather than slapping on whatever is on the shelf. For out-of-warranty or obsolete GAF shingles, we source equivalent quality aftermarket shingles matched for color and performance, and we tell you up front what you are getting and why.
The repair-versus-replace decision is not a sales tactic with us. If a Timberline roof has a single storm-damaged slope and the rest of the roof has five or more years of life, we repair and leave the rest alone. If the granules are failing on three slopes, the underlayment is shot, and the deck needs work, a patch is money you’ll spend twice. We write both options with real numbers and let you decide. Call (831) 610-5598 and we’ll put a written price in front of you.
Our GAF Service Process – Step by Step
- 1
Diagnosis. We inspect the roof surface, flashing, penetrations, attic ventilation, and drainage. For GAF systems we pay special attention to seam welds on TPO, granule adhesion on Timberline shingles, and underlayment condition at eaves and valleys. You get a written description of what we found and what it will cost to fix.
- 2
Repair or replacement. We replace damaged shingles, re-weld failed TPO seams, repair underlayment, reset ridge vents, and re-flash penetrations using GAF-compatible materials. On tear-offs we remove all layers to the deck, re-sheath as needed, and install new underlayment before any shingle goes down.
- 3
Test and verify. After the work is done we water-test repaired areas where practical, check that drainage is moving correctly, and walk the roof with you if you want to see it. The job is not done until water flows where it should and nothing is leaking.
- 4
Warranty in writing. Every GAF repair and replacement we complete carries our 365-Day Done Right Promise. If the work fails inside that window, we come back and correct it at no charge. You get the guarantee in writing, not as a verbal promise.
GAF Products We Service & Install in San Francisco
We service and install GAF Timberline HDZ and Timberline UHDZ architectural shingles, which are the most common GAF products on San Francisco homes. We also work on GAF EverGuard TPO membranes for low-slope and flat roofs, GAF StormGuard and Shingle-Mate underlayments, and GAF Cobra Ridge Vent. We stock common Timberline shingle bundles, ridge vents, and underlayment locally for fast turnaround on repairs, and we order specific color runs when a match is required.
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AfterWe Also Service These Brands
GAF is one part of what we do, not the only part. We install and service KraftMaid cabinetry, Cambria and Silestone surfaces, and Kohler fixtures across San Francisco, which means one crew can handle roof work, gutters, and our General Contractor services for the remodel that comes after. Our brand roster is documented, so specifications are traceable and quality is not left to guesswork.
FAQs – GAF Construction Service in San Francisco
Curled and cracked Timberline shingles after eight years are almost always a ventilation or moisture problem, not a manufacturing defect. On north-facing slopes in the fog belt, shingles never fully dry, moss colonizes, and the granule layer breaks down. Attic heat worsens it from below. The fix is replacing damaged shingles and adding proper intake and exhaust ventilation so the new shingles don’t fail the same way. Call (831) 610-5598 and we’ll inspect the slope and tell you exactly what’s failing.
Many GAF EverGuard TPO roofs in San Francisco can be repaired if the membrane is still flexible and the failure is isolated to seams or penetrations. If the membrane has shrunk, pulled away from parapet walls, or developed widespread seam delamination, replacement is the honest answer. We’ll write both options with real numbers. Call (831) 610-5598 for a free estimate on your TPO roof.
Yes. Three layers of shingles on a Victorian-era San Francisco roof means the deck is carrying far more weight than current code allows, and the layers are trapping moisture that is rotting the sheathing from the inside. A proper tear-off gets you down to the deck, lets us repair structural damage, and gives you a single new roof layer that will actually shed water. We pull permits where required and handle the full demolition and re-roof.
For low-slope roofs in San Francisco’s fog belt we recommend GAF StormGuard as the primary underlayment at the eaves, valleys, and any low-slope sections. It’s a self-adhered membrane that seals around fasteners and resists water backing up under the roof covering. On steep slopes we use Shingle-Mate felt or synthetic underlayment over StormGuard at critical areas. The specific product depends on your roof pitch and existing deck condition. Call (831) 610-5598 and we’ll spec it in writing.
We use genuine GAF Cobra Ridge Vent, StormGuard, and Shingle-Mate when the job calls for those specific products, and that’s our standard on full GAF tear-offs and replacements. Where an equivalent aftermarket accessory performs as well and costs less, we tell you and price it in writing. You always know what you’re getting before we start.
GAF Construction Cost in San Francisco
GAF roofing work in San Francisco is priced by the job, not by the hour. Repairs run the full range depending on what we find once we look under the shingles. Here’s what to expect:
| Service | Price Range |
|---|---|
| Roof Repair | $470 – $2125 |
| Roof Replacement | $9440 – $23600 |
| Gutters & Accessories | $470 – $2125 |
A repair on a Timberline slope runs $470 to $2,125 depending on shingle count, underlayment damage, and flashing work. A full GAF tear-off and replacement on a typical San Francisco single-family home runs $9,440 to $23,600, driven by roof size, number of existing layers, deck repairs, and whether the building department requires seismic upgrades. Gutters and downspouts run $470 to $2,125 depending on linear feet and materials. Call (831) 610-5598 for a written line-item quote, not a ballpark over the phone.
Every number we give you is in writing before any work starts. The 365-Day Done Right Promise covers every GAF repair and replacement: if the work fails inside a year, we come back and correct it at no charge.
Book Your GAF Service in San Francisco, CA
We service GAF roofing systems throughout San Francisco, from the Outer Sunset to Bernal Heights. Call (831) 610-5598 to schedule your free GAF roof inspection and estimate. A live person answers, and you’ll get a written price before any work begins.
Written by Curtis Lane, Owner at Bradford Remodeling Co San Francisco, serving San Francisco since 2004.
