Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
GAF Construction in San Francisco, CA | Iron Beam Contractors
GAF construction service in San Francisco means working on roofs that sit atop Victorians built before the 1906 earthquake, surviving fog, steep hills, and one of the strictest building codes in the country. We’re Iron Beam Contractors, an independent GAF contractor. We handle GAF roof repair, replacement, and storm damage across San Francisco, and we understand how the city’s mandatory soft-story retrofit rules and 72-hour demolition notification requirements affect your roofing project. Call (833) 756-5936 for a free estimate.
Why San Francisco Residents Choose Us for GAF Service
Most roofing crews in San Francisco can nail shingles. Few of them understand what happens when a GAF Timberline system meets a 1920s skip-sheathing deck on a 25-degree slope in Bernal Heights. We do, because that’s the work we’re on every week. Nolan Driscoll, our owner, built Iron Beam Contractors on a straightforward principle: tell the homeowner exactly what’s in the wall before you open it. That applies to roofs too. We inspect the deck, the flashing, the ventilation before we quote a re-roof, so you’re not surprised by hidden damage after the old shingles come off. We’re independent, not manufacturer-affiliated, which means we recommend what the roof actually needs, not what a corporate program tells us to push. We specify GAF because their shingle systems hold up in San Francisco’s wet marine climate when installed correctly. That last part matters more than the brand name.
Styles & brands we work with
Common GAF Construction Problems We Solve in San Francisco
- Wind-driven rain lifting shingles at ridges and valleys. On the narrow, steep roofs of Bernal Heights and Noe Valley, GAF shingles at ridges and valleys fail early when wind drives rain sideways and attic ventilation is poor. Sealant breaks down, shingles lift, and water finds the gaps. We re-secure or replace the affected courses and correct the ventilation so it doesn’t recur.
- Granule loss and flashing leaks over original skip-sheathing. We routinely find GAF Timberline shingles installed over 1x board decking on 1920s Victorians. Nails miss the rafters, decking flexes, granules slough off, and flashing pulls loose. On a steep block in Bernal Heights, we tore off three layers of old roofing and found the original skip-sheathing had separated from the rafters. We re-decked the entire roof with plywood and installed GAF Timberline HDZ with a full Ice & Water Shield at the eaves and valleys. That homeowner had been patching leaks for years. The new deck stopped the water that had been staining the interior ceilings.
- Algae staining and moss on north-facing slopes. In the foggy Outer Sunset and Inner Mission, prolonged moisture on north-facing roof planes feeds algae and moss growth on GAF shingles, especially under tree cover. We remove the growth and recommend GAF StainGuard Plus shingles when a replacement is in order.
- Flashing separations after soft-story seismic retrofits. New shear walls and roof-to-wall ties move the building slightly. If the roof work isn’t sequenced with the retrofit, we see flashing separations and cracked shingles around the retrofitted areas. We’ve repaired enough of these to know the roof should go on after the retrofit, not before.
- Leaks around original brick chimneys. Pre-1950 San Francisco homes often have brick chimneys that fail seismic standards. The flashing where chimney meets GAF shingle is a classic leak point. We rebuild the flashing detail and, where the chimney is compromised, recommend structural remediation before the roof goes back on.
GAF Service in San Francisco: What Local Conditions Mean for Your Equipment
San Francisco’s 72-hour notification rule before any demolition or foundation work applies to roof tear-offs too, when the roof connects to a soft-story retrofit permitted under the city’s mandatory retrofit ordinance. That’s a sequencing detail generic GAF pages never cover. Here’s what it means in practice: if you own a pre-1978 wood-frame building with a soft-story condition, and you’re doing the mandatory seismic retrofit plus a GAF re-roof, the city’s inspection windows dictate the order of operations. You can’t demo and re-roof on a whim. We sequence GAF re-roofs around the retrofit inspection schedule, so you don’t get caught waiting on a permit while your old roof is already torn off. On hillside streets like 20th Street in Bernal Heights, excavation deeper than five feet triggers slope stability review and shoring plans, which can affect drainage details at the roof line. We’ve worked through enough of these to plan around them from day one.
GAF Models & Products We Service in San Francisco
We work on the full GAF residential line: Timberline HDZ, Timberline UHDZ, Timberline ArmorShield II, and the Liberty self-adhered membrane system for low-slope sections. We use GAF-manufactured components throughout: shingles, underlayments, ridge vents, starter strips. That keeps the system warranty intact. But we never overlay a failing roof. If the deck or flashing is compromised, we recommend a full tear-off and rebuild rather than a repair that will fail in a season. Our approach to parts is simple: OEM components, stocked locally for fast San Francisco turnaround. If you need GAF sales & service, we can source and install the right system for your roof’s slope, exposure, and the city’s wind uplift requirements.
See the difference
Before
After
Before
After
Before
AfterGAF Service Pricing in San Francisco
| Service | Typical Range |
|---|---|
| Roof Replacement | $9,440 – $23,600 |
| Roof Repair | $470 – $2,125 |
| Metal Roof Installation | $17,700 – $47,200 |
| Tile Roof Repair | $710 – $2,950 |
What drives the cost: roof square footage, pitch, number of layers to tear off, deck condition, and whether the project ties into a soft-story retrofit. A free estimate from us includes a written line-item quote, not a verbal ballpark. Call (833) 756-5936 and we’ll walk the roof with you.
Serving San Francisco, CA — Our Local Coverage Area
We’re based in the San Francisco area and know this community well, including Mission District GAF service. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – GAF Construction in San Francisco
Yes. San Francisco requires a building permit for roof replacements, and the project must comply with the city’s building code, including seismic and wind uplift provisions. We pull permits and handle the inspections. Call (833) 756-5936 for a free estimate on a fully permitted GAF roof replacement.
We won’t overlay a failing roof. Overlaying hides deck rot, broken flashing, and ventilation problems, and it voids the GAF system warranty in most cases. We’ll tear off the old layers, inspect the deck, and rebuild what needs rebuilding. Call (833) 756-5936 and we’ll give you an honest assessment.
GAF Timberline HDZ with StainGuard Plus handles the moisture and algae pressure of the Outer Sunset and GAF repair in Noe Valley better than standard shingles. On steep slopes and valley-heavy roofs, we often specify Ice & Water Shield at the eaves and valleys. The right spec depends on your roof’s exposure and pitch, and we’ll walk you through it.
The retrofit ordinance requires seismic upgrades on many pre-1978 wood-frame buildings with soft-story conditions, and the work often disturbs the roof-to-wall connection. We sequence the roof replacement after the retrofit’s shear wall and tie-down work passes inspection. That sequence prevents flashing separations and cracked shingles later. Call (833) 756-5936 to coordinate both scopes.
Yes. Winter rain and wind in San Francisco cause ridge and valley failures, flashing separations, and leaks around chimneys and skylights. We respond to storm damage calls across the city, tarp and patch to stop the water, then schedule a permanent GAF in Visitacion Valley or replacement. Call (833) 756-5936 as soon as you see a leak.
Service Areas Near San Francisco
We serve San Francisco’s neighborhoods and the surrounding area, including San Francisco service area ZIP codes 94127, 94128, 94129, and 94130. For GAF-specific work in adjacent communities, see GAF service in Chinatown and GAF service in Tiburon. We also work in Laguna Woods, Laguna Hills, and Mission Viejo for clients with multiple properties.
Book Your GAF Service in San Francisco Today
If your GAF roof needs repair, replacement, or a post-storm inspection in San Francisco, call Iron Beam Contractors at (833) 756-5936. We’ll schedule a free estimate, walk the roof with you, and tell you exactly what’s needed before we touch a shingle. One contractor, every phase.
Written by Nolan Driscoll, Owner at Iron Beam Contractors, serving San Francisco and the surrounding communities.