Metal roofing
Tile roofing
GAF
Owens Corning
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roofing Company Across San Lorenzo
If you’re searching for a Roofing Company that understands San Lorenzo’s post-war tract homes, you’ve found one. We know these 1940s and 1950s houses intimately: the low-slope roofs, the minimal overhangs, the original built-up layers that are decades past their intended life. Our crews serve San Lorenzo daily with honest assessments, written pricing, and repairs that hold through the wet winters. Call (831) 228-3330 to schedule your free estimate.
Why Birchbark Roofing San Francisco Is San Lorenzo’s Preferred Roofing Company
San Lorenzo homeowners call us because we treat their homes the way we’d want our own treated. Shoe covers go on at the door, drop cloths run through the hallway to the attic access, and every bit of debris is cleared and photographed before we pack up. That’s not a bonus feature; it’s the baseline here. We’re part of the Cedarwell family of roofing companies since 2000, and every location holds to the same promise: a written price before any work starts, a 365-Day Done Right Promise on every repair and replacement, and a crew that respects the family inside the house.
Erik Lindgren leads our team with a simple rule: if we wouldn’t do it on our own home, we don’t do it on yours. Background-checked, uniformed technicians arrive ready to explain exactly what they found, what it costs, and how long it’ll take. No surprises, no pressure. Just roofing done carefully.
Styles & brands we work with





Roof Inspection in San Lorenzo
A roof inspection in San Lorenzo is the fastest way to find out whether your low-slope roof is holding up or quietly failing. San Lorenzo’s winter rains saturate old built-up roofing and wind-driven salt air attacks flashing and fasteners long before shingles show obvious damage. We inspect the entire roof surface, the edge metal, the fasteners at the first course, the flashings at parapets and penetrations, and the underside in the attic where possible. You get photographs, a written condition report, and a line-item price for anything that needs attention.
What We Check on Every San Lorenzo Inspection
We look at the roof’s edge metal first. On San Lorenzo homes, galvanized drip edge corrodes from salt exposure within ten to fifteen years, and once it’s rusted through, wind-driven rain gets under the shingle edge and starts rotting rafter tails from the outside in. We also check the starter course fasteners. Original steel nails on 1950s roofs have often corroded to dust by now, which means the shingles look fine but the wind uplift capacity is gone.
A roof inspection in San Lorenzo typically runs $195 to $350 depending on the size and accessibility of the roof. If the inspection leads to a repair or replacement, we credit the inspection fee toward the work. Call (831) 228-3330 to book yours.
When to Schedule an Inspection
October is the smartest month. You beat the heavy rain season and we have time to fix what we find before the first real storm. March works too, after the winter has shown you any weak spots. If you’ve seen ceiling stains, damp attic insulation, or granules collecting in the gutters, don’t wait for the next rain to confirm it. An inspection now costs less than the drywall repair later.
Most residential roof inspections in this scope run between $195 and $350; you’ll see your exact number in writing before we start.
Commercial Roofing in San Lorenzo
Commercial roofing in San Lorenzo comes with its own set of challenges, and they’re mostly about flat and low-slope membrane systems. Strip malls along Hesperian Boulevard, church sanctuaries in the Village, and light industrial buildings near the San Lorenzo Creek corridor all deal with the same issue: ponding water. Low-slope commercial roofs in San Lorenzo hold standing water after winter rains, and that water eventually finds its way through seams, patches, and failed drains. Salt-laden moisture makes it worse, corroding metal flashings around rooftop HVAC curbs and cracking old asphalt and gravel caps.
We handle re-roofs, coatings, and targeted repairs for San Lorenzo commercial properties. The goal is always the same: keep water moving off the roof and keep business running underneath. We work with materials from GAF and CertainTeed for single-ply and modified systems, and we schedule around your business hours so work doesn’t interrupt your day.
Flat Roof Repair vs. Replacement
For a commercial flat roof in San Lorenzo, a targeted repair to a failing drain or a split seam runs $850 to $2,400. A full replacement of a small commercial roof, say 2,000 square feet, starts around $18,000 and ranges up to $45,000 depending on the existing layers, substrate condition, and whether new tapered insulation is needed. San Lorenzo’s older commercial buildings sometimes need a full tear-off down to the decking because the original built-up roof has been patched so many times there’s nothing solid left to adhere to.
Inspection Before You Invest
Before you commit to a commercial roofing project in San Lorenzo, we do a full inspection and give you a written proposal with a precise scope and a fixed price. No change orders unless the structure itself changes. Call (831) 228-3330 for a commercial roof inspection here in San Lorenzo.
Trusted Brands We Service in San Lorenzo
We stock and install materials from GAF, CertainTeed, and Tamko for San Lorenzo homes and businesses. GAF’s architectural shingles are our go-to for the re-roofs we do on 1950s tract homes; they shed water well on low-slope applications when detailed correctly. CertainTeed’s membrane systems serve the flat and commercial jobs along Hesperian Boulevard. Tamko’s shingles offer a solid mid-range option when budget matters. Because we maintain local stock, San Lorenzo customers aren’t waiting weeks for materials to arrive from a distributor. We order ahead, we keep common sizes in hand, and we turn repairs around quickly.
See the difference
Before
After
Before
After
Before
AfterCommon Roofing Company Problems We See in San Lorenzo Homes
- Rusted drip edge and fascia. San Lorenzo’s salt-laden winter rain and fog attack the roof’s edge metal first. Once galvanized drip edge rusts through, water runs under the shingle edge and rots the barge rafters from the outside in. By the time a homeowner sees the exterior rot, the interior framing damage is already done.
- Corroded fasteners in the starter strip. Original steel nails from the 1950s have often returned to dust by now. The shingle field can look completely fine while the first course and starter strip have no effective mechanical attachment. One good wind storm can peel the edge right off.
- Ponding on low-slope and flat roofs. San Lorenzo’s minimal roof overhangs and shallow slopes mean water doesn’t shed quickly. After a week of winter rain, standing water works into every seam, split, and blister. Built-up gravel roofs hide this remarkably well; the gravel looks fine while the plies underneath are saturated.
- Ceiling stains in Village bungalows. In the Village neighborhood, you can spot original 1950s shake roofs that have been repeatedly patched. When the winter rains start, those are the first to call. The water is usually entering at the eaves or around the chimney flashing, not through the field of the roof.
Pricing for Roofing Company in San Lorenzo, CA
Roof repairs in San Lorenzo run $450 to $1,800 for typical work like replacing a rusted drip edge run, fixing a flashing, or repairing a small section of shingles or built-up roofing. A full roof replacement on a typical 1,200-square-foot San Lorenzo tract home ranges from $14,000 to $28,000, depending on the tear-off, the substrate condition, and whether new plywood decking is needed. The coastal-spec difference matters here: upgrading to 316 stainless drip edge and hot-dip galvanized ring-shank nails adds roughly $800 to $1,600 to a typical reroof versus budget galvanized materials. That’s the price gap between a roof that holds through winter storms and one that starts rusting at the edges within a decade. You’ll see your exact number in writing before any work begins. Call (831) 228-3330 for a free estimate.
We Also Serve Cities Near San Lorenzo
Our San Lorenzo crews regularly handle roofing work across the East Bay and the Peninsula. We serve Oakland, Alameda, Moraga, and San Mateo, bringing the same written pricing and clean-up standards to every home. If you’re a few minutes outside San Lorenzo, call us anyway. We’ll let you know exactly when we can be there.
Serving San Lorenzo, CA - Our Local Coverage Area
We’re based in the San Lorenzo 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 Roofing Company in San Lorenzo
We use hot-dip galvanized ring-shank nails for shingle fastening on San Lorenzo roofs. Galvanized nails hold through decades of salt-laden fog and rain far better than common steel or electroplate nails, which we see corroded to dust on original 1950s roofs all the time. For edge metal, we specify 316 stainless steel drip edge because it holds up to San Lorenzo’s corrosive microclimate without rusting through the way standard galvanized edge does. The fastener upgrade costs a little more, roughly $800 to $1,600 on a full reroof, and it’s the difference between a roof that holds through storms and one that fails at the edges. Call (831) 228-3330 if you’d like a line-item quote showing exactly what the coastal-spec fasteners cost on your roof.
Hayward sits further from the shoreline and gets measurably less salt fog deposition than San Lorenzo. Galvanized drip edge on a Hayward roof might last twenty years; on a San Lorenzo home exposed to salt-laden fog and winter rain off the Bay, that same galvanized edge can rust through in ten to fifteen. We’ve pulled rusted-through galvanized drip edge off Village bungalows where the shingles above it still looked perfectly fine. The edge metal did its whole failing quietly at the eaves. Stainless steel isn’t a premium upsell here; it’s the spec that matches San Lorenzo’s actual conditions. Call (831) 228-3330 and we’ll show you the cost difference in writing before you decide.
On a typical 1,200-square-foot San Lorenzo reroof, the coastal-spec upgrade adds roughly $800 to $1,600. That covers 316 stainless steel drip edge instead of galvanized, hot-dip galvanized ring-shank nails instead of budget fasteners, and ice and water shield at the eaves. The inland-spec version of that same roof, using standard galvanized edge and basic fasteners, might look identical from the street on day one. But within a decade on a San Lorenzo tract home, the edge metal will be rusting through and the first-course fasteners will be losing their grip. The cheap spec ends up costing more because you’re paying for another repair in ten years, plus whatever water damage happened in the meantime. We give you both numbers in writing so you can see the real comparison. Call (831) 228-3330 for a detailed quote.
We see more failures on built-up gravel roofs in San Lorenzo, especially the original layered systems installed in the 1940s and 1950s. Gravel caps disguise problems that shingles would expose: the gravel looks intact while the plies underneath are saturated and splitting. Composition shingle roofs fail more visibly, with curling, granule loss, and missing tabs, so homeowners catch the problem earlier. Built-up roofs tend to fail by slow water intrusion that’s been happening for years before anyone notices a ceiling stain. If you have an original built-up roof in San Lorenzo and you haven’t had it inspected in five years, now is the time. Call (831) 228-3330 to schedule an inspection; the fee is credited toward any repair we recommend.
We schedule non-emergency inspections and repairs in San Lorenzo within three to five business days. If a winter storm has opened up your roof and water is coming into the house, call (831) 228-3330 day or night. A live person answers every call, and we’ll get a tarp on the roof and a plan in motion immediately. For scheduled work like a reroof or a full inspection, we’re usually on-site within a week of your call. Estimates are always free, and every job starts with a written price before any work begins.
Written by Erik Lindgren, Owner at Birchbark Roofing San Francisco, serving San Lorenzo and the surrounding Bay Area.