Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
After
Before
AfterFast, Reliable Roof Repair Across San Francisco
Roof repair in San Francisco usually means working on a flat or low-slope membrane, not the pitched shingle roof you see in the suburbs. Most of the city’s Victorian and Edwardian rowhouses were built with tar-and-gravel or modified bitumen systems, and decades of fog, salt air, and unpermitted rooftop decks have taken their toll. Birchbark Roofing lives in that reality. We know which neighborhoods rot from the metal outward and which failure modes show up again and again on the coastal grid. Crews serve San Francisco locally, coordinated from our San Francisco Roofing Company office. Call (424) 766-4937 and a live person answers, any hour, any day.
Why Birchbark Roofing Is San Francisco’s Preferred Roof Repair Company
We earn trust the slow way: a written price in dollars before any work starts, shoe covers at the door, drop cloths through the hallway, and a photo of the completed clean-up before the crew leaves. That matters to San Francisco families with kids and pets who have watched other contractors treat their home like a job site. Our Roof Repair crews are background-checked and uniformed, so you know exactly who is walking through your door and onto your roof.
Erik Lindgren built Birchbark Roofing inside the Cedarwell family of independently owned and operated roofing businesses, which has held local roofing companies to the Cedarwell Care Promise since 2000. Every job carries the 365-Day Done Right Promise: if the work is not right, we make it right. No fine print. No negotiation. We also stock local parts for San Francisco customers, which means fewer return trips and shorter repair windows when fog keeps rooftops damp and seams vulnerable.
Roofing in San Francisco is not a side business for us. It is the whole business. We see the same failure modes again and again: corroded drip edge on Outer Sunset tar-and-gravel roofs, blistered seams in the Richmond, rooftop deck penetrations lag-bolted through membranes in Noe Valley. Familiarity with those patterns changes how fast we diagnose a leak and how accurately we price the fix. You get a number that holds, not a guess that grows.
Metal Roof Repair in San Francisco
Metal roof repair in San Francisco is a materials decision more than a labor decision, because salt air near the Golden Gate attacks standard galvanized hardware fast. We replace corroded fasteners with stainless or hot-dip galvanized hardware, re-flash penetrations with marine-grade finishes, and seal joints that have opened under years of fog-driven expansion and contraction. A typical metal roof repair in San Francisco runs $450-$1,200 depending on the number of penetrations and the condition of the surrounding panel field.
Fastener and Seam Failure
The most common call we get from metal roof owners in the Outer Richmond and Sunset is a leak that traces back to a rusted fastener or a failed seam, not a hole in the panel. Salt-laden damp sits on those roofs for weeks at a stretch, and once the galvanized coating is gone, the fastener head becomes a channel for water. We pull the failed hardware, inspect the substrate, and set stainless replacements with the correct washer stack so the next decade of fog does not repeat the failure.
Flashing and Penetration Re-Seal
Chimneys, vent pipes, and skylight curbs on older San Francisco homes often have flashing that was installed with hardware meant for a drier climate. We cut out the corroded flashing, install new metal with the correct overlap and sealant for marine exposure, and tie the repair back into the existing roof with matching finishes. It is slower than slapping caulk over rust, but it lasts.
Commercial Roof Repair in San Francisco
Commercial roof repair in San Francisco often means a flat built-up or modified bitumen system that has been patched by multiple hands over multiple decades. We find layered re-roofing patches hiding saturated insulation, and we find the same unpermitted deck penetrations on commercial properties that we see on Victorians. Commercial repairs here typically run $800-$2,500 for a scoped, written repair; larger membrane sections or parapet rebuilding push higher, and you will see your exact number in writing before we begin.
Membrane Patch and Seam Repair
Flat commercial roofs in San Francisco fail at the seams first, because fog keeps the membrane damp and the thermal cycling never stops. We cut back blistered or cracked sections, inspect what is underneath, and tie new modified bitumen or TPO into the existing field with the correct primers and heat welds. Every repair is written before we start, and the crew photographs the clean-up before they leave.
Deck Penetration Remediation
When a commercial building has a rooftop deck or HVAC curb that was bolted through the membrane, we see the same waterproofing breach the SF Department of Building Inspection flags on residential re-roofing permits. We remediate each penetration: cut back the saturated layers, install ice and water shield around the penetration, re-flash with stainless hardware, and seal the joints with marine-grade caulk before tying back into the field. It is the repair that prevents the next repair.
Trusted Brands We Service in San Francisco
We work with materials from GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral, because different San Francisco roofs demand different systems. A flat Victorian in the Mission needs a different membrane than a coastal metal roof in the Outer Sunset, and we stock local parts so we are not waiting on a distributor when your roof is leaking. GAF and CertainTeed in San Francisco modified bitumen are common choices for the flat built-up and low-slope systems that dominate the city. Atlas and Tamko materials show up often on the few pitched roofs in the eastern neighborhoods. Whatever system your roof uses, the repair is matched to what is already up there, not whatever is on the truck.
Common Roof Repair Problems We See in San Francisco Homes
- Seam and blister failures on flat built-up roofs. In the Outer Sunset and Outer Richmond, fog keeps membranes damp for weeks and seams never fully cure. The result is blistered, cracked seams that open up under foot traffic or thermal cycling.
- Corroded fasteners, drip edge, and flashing at coastal addresses. Standard galvanized hardware pits and fails fast in salt air, so repairs rot from the metal outward, not from the membrane inward, which means a leak that looks small is often structural underneath.
- Unpermitted rooftop deck penetrations on Victorians. We regularly find deck framing lag-bolted straight through the membrane into the structural roof deck. It is a classic San Francisco upgrade that DBI now flags on any re-roofing permit pull, and it has to be fixed before the new membrane goes down.
- Moss and debris accumulation on low-slope decks. Fog and shade keep certain Noe Valley and Twin Peaks roofs damp enough for moss to colonize, and moss holds water against the membrane, which accelerates seam failure and hides leaks until they reach the ceiling.
Pricing for Roof Repair in San Francisco, CA
You should see actual numbers before you decide who to call. A typical leak repair on a flat modified bitumen roof in San Francisco runs $350-$850. Flashing repair around a chimney or vent boot lands between $400 and $900. Metal roof fastener and seam repair runs $450-$1,200. A rooftop deck penetration remediation with stainless re-flashing and marine-grade sealant typically runs $600-$1,800 depending on the number of penetrations. Coastal-spec work in the Outer Sunset and Outer Richmond often adds 15-25% over the identical inland job because the hardware and sealants cost more, and we will show you exactly where those dollars go in the written quote. Call (424) 766-4937 and we will come out, look at the roof, and hand you a written number before any work starts. Free estimate, no obligation.
We Also Serve Cities Near San Francisco
Our crews work across the Bay Area. If you are just over the border in Daly City, Brisbane, Sausalito, or South San Francisco, we serve those homes and businesses too. The same written pricing, the same shoe covers and drop cloths, the same San Francisco standard of care. Call (424) 766-4937 and we will schedule a time that works for you.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Roof Repair in San Francisco
Because the fog belt changes what materials will survive. In the Outer Sunset and Outer Richmond, Karl the Fog keeps flat membranes damp for weeks, and salt-laden air attacks standard galvanized hardware fast. A repair that is perfectly adequate two miles east on the sunnier slope will corrode and fail on the coastal grid. So we specify stainless or hot-dip galvanized fasteners, marine-grade finishes, and sealed penetrations on coastal addresses, which adds 15-25% to the material cost. The cheap inland spec looks identical on a bid, but the metal rots from the inside out within a decade and you pay for the repair twice. Call (424) 766-4937 and we will show you both specs on paper so you can choose with your eyes open.
It does not block the repair, but it often expands the scope. On a Victorian rowhouse in Noe Valley, our crew opened what the homeowner thought was a simple leak and found a rooftop deck lag-bolted straight through the membrane into the structural decking. The SF Department of Building Inspection now flags those penetrations on any re-roofing permit pull, so roofing contractors have to remediate them as part of the job scope. We cut back the saturated layers, reinstall ice and water shield around each penetration, re-flash them with stainless hardware, and seal the joints before tying the new membrane back in. Two winters of fog later, that homeowner has had no callbacks. The fix is not optional if you want the repair to hold.
Yes, and yes. We repair metal roofs across San Francisco, and salt air near the Golden Gate is the single biggest factor in how we spec the hardware. Standard galvanized fasteners pit and fail in salt air, so we replace them with stainless or hot-dip galvanized hardware and re-flash penetrations with marine-grade finishes. A metal roof repair in the Outer Richmond or Sunset runs $450-$1,200 for typical fastener and seam work. The price includes the coastal-grade materials, because putting inland-spec hardware on a coastal roof means the same leak returns in a few years. Call (424) 766-4937 for an exact quote; estimates are free.
A square is 100 square feet of roof area. Roofing bids use squares because flat roofs and low-slope roofs run in large uniform sections, and membrane and labor are priced per square. When you compare bids for a San Francisco flat roof repair, ask each contractor how many squares they are actually repairing and what materials they are using per square. A bid that is $200 cheaper may be repairing fewer squares, using thinner membrane, or skipping the coastal-grade hardware that the Outer Sunset and Richmond need. We show you the square count and the material spec in writing before any work starts. Call (424) 766-4937 and we will walk you through a real bid, line by line.
Usually yes. We work with materials from GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral, and we stock local parts for San Francisco customers so we are not waiting on a distributor. For shingle repairs on pitched roofs, we match the existing shingle brand and color as closely as the product line allows, and we tell you honestly if an exact match is no longer manufactured. For membrane repairs, we tie new modified bitumen into the existing field with the correct primers and heat welds, so the patch is as close to seamless as the existing roof allows. If a visible mismatch will bother you, say so up front and we will price the repair to cover a larger section.
How Salt Air Decides the Spec, Not the Schedule
Because the Outer Sunset and Outer Richmond sit under Karl the Fog for weeks at a time, flat built-up and modified bitumen membranes there never fully dry or cure between wet events. Salt-laden damp attacks fastener heads and metal flashings first, and a repair that is perfectly adequate two miles east on the sunnier slope will corrode and fail on the coastal grid. That is why the same roof repair job splits into a coastal spec and a cheaper inland spec. The coastal spec uses stainless or hot-dip galvanized fasteners, marine-grade finishes, and sealed penetrations. The inland spec looks identical on a bid but costs more within a decade, because the metal rots and the leak comes back. We write both specs on paper for you, and we recommend the coastal spec for any address west of Twin Peaks. The cheap version is not cheap if you pay for it twice.
If you are reading this because your San Francisco roof is leaking, call us. We will come out, look at the damage, and put a written price in your hand before any work starts. Shoe covers at the door, drop cloths through the hallway, all debris cleared and photographed before we leave. Call (424) 766-4937 for a free estimate.
Written by Erik Lindgren, Owner at Birchbark Roofing, serving San Francisco with roof repair backed by the 365-Day Done Right Promise.