Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterCertainTeed Roofing in San Francisco, CA | Mercer Roofing
We provide independent CertainTeed roofing service across San Francisco, from the fog-heavy Outer Sunset to the attached rowhouses of the Mission and Castro. The thing that makes our CertainTeed work here different is simple: we know how these shingles and membranes actually behave under a chronic marine layer and on zero-lot-line roofs where every bundle of material has to come over a parapet by rope. Call us at (743) 200-8347 for a free estimate, and you’ll get a written price before any work starts.
We’re an independent CertainTeed service provider. Mercer Roofing is not manufacturer-affiliated or authorized, and we’ll never pretend otherwise. What we are is a roofing crew that has installed and repaired CertainTeed Landmark shingles, Presidential Shake, Xtreme WeatherGuard underlayment, and DiamondDeck membrane across San Francisco’s fog-belt neighborhoods for years. We match OEM CertainTeed materials whenever possible, and when an aftermarket flashing or vent will outperform the original, we’ll tell you that too. Our full CertainTeed sales & service capability covers everything from leak repair to full re-roofs, always with a written guarantee on every repair and the 365-Day Done Right Promise backing the work.
Why San Francisco Residents Choose Us for CertainTeed Service
CertainTeed is a brand a lot of roofers carry, but few actually know. Grant Whitlock, owner of Mercer Roofing, has been reading roofs before touching them since he learned structural fundamentals at Los Angeles Trade-Technical College. When we show up to a San Francisco Edwardian with CertainTeed Landmark shingles on a small front slope, we’re not learning the product line on your dime. We’ve seen how these shingles lose granules at the fog edge, how Presidential Shake cracks when the attic ventilation can’t keep up with the marine layer, and how Xtreme WeatherGuard wrinkles at lapped edges when fasteners get over-driven on low-slope transitions.
Nobody opens the door to a roofing estimate wanting uncertainty about who’s standing there. That’s why every Mercer Roofing technician’s name and photo is sent to you before the visit, and every tech arrives in a clean uniform with a photo ID badge at the door. Background-checked, identity-verified, Threshold Verified. A live person answers our phone 24/7, not a voicemail. You’ll get a written price before any work starts, and a written guarantee on every repair. If a repair fails within a year, the second visit is free. That’s the standard for every job we do as a San Francisco Roofing Company.
Common CertainTeed Roofing Problems We Solve in San Francisco
- Granule loss and edge curl on Landmark shingles. On Victorian and Edwardian pitched accents throughout the Richmond and Sunset Districts, fog-driven moisture cycling saturates shingles for weeks at a stretch. The constant wet-dry cycle at the fog edge causes granules to slough off and shingle edges to curl far sooner than the same product would in Oakland or San Jose.
- Cracking and blistering Presidential Shake. Stucco homes from the 1920s through 1940s, common in the Sunset and Richmond, often carry undersized attic ventilation. Presidential Shake shingles trap heat beneath them, and when the marine layer keeps ambient moisture high, the shingles crack and blister at the surface.
- Wrinkled, unsealed Xtreme WeatherGuard underlayment. Over-driven fasteners on low-slope or flat transitions create hidden leak paths. The lapped edges lose their seal, and fog-driven moisture tracks underneath quietly for months before a ceiling stain shows up inside.
- Algae streaking and membrane micro-cracking. On low-slope CertainTeed systems in the Outer Sunset and around Twin Peaks, persistent fog saturation feeds algae growth and causes micro-cracking in the mat. Identical roofs in the Mission or Potrero Hill, just a few miles away, age years slower.
- Flashings that leak before the field does. San Francisco’s flat and low-slope profiles concentrate water movement at parapet walls, sidewall intersections, and interior drains. CertainTeed systems fail at flashings disproportionately here because the chronic moisture is always present, not just during a storm event.
CertainTeed Service in San Francisco: What Local Conditions Mean for Your Equipment
Here’s the thing about San Francisco that a generic roofing page won’t tell you: attached rowhouses across the Castro, Mission, and Western Addition share party walls with zero side-yard access. There is no alley, no side gate, no path to carry materials around the back. Every bundle of CertainTeed shingles, every roll of Xtreme WeatherGuard, every sheet of decking has to be hoisted over the front parapet by rope and pulley, or carried through the client’s occupied front room and up the interior stairs. This adds meaningful labor hours to nearly every re-roof in these dense flatlands, and any accurate San Francisco bid must account for it explicitly. If you’re comparing quotes and one seems suspiciously low, ask whether they’ve priced the hoist. We do, every time, because we’ve done the work and we know what it takes. This is the same reason our San Francisco service area coverage includes this kind of site-specific planning before the crew ever shows up.
In the Outer Sunset, a homeowner with a 1930s stucco house called us about a persistent ceiling stain that had returned after two other patch attempts. We found the CertainTeed Landmark shingles on the small front slope had lost granules and the Xtreme WeatherGuard underlayment beneath was wrinkled and unsealed at a sidewall lap, letting fog-driven moisture track down into the flat roof assembly. After replacing the failed underlayment section and re-flashing the wall, we installed new CertainTeed Landmark shingles over the repaired deck, and the leak has stayed dry through two foggy seasons thanks to our San Francisco Roof Repair expertise.
CertainTeed Models & Products We Service in San Francisco
We work on the full CertainTeed residential line that shows up on San Francisco roofs: Landmark architectural shingles on Victorian and Edwardian pitched accents, Presidential Shake (TL) on larger stucco homes, Xtreme WeatherGuard self-adhered underlayment beneath both, and DiamondDeck protection membrane on low-slope and flat transitions. Our approach to parts is straightforward: we match OEM CertainTeed shingles, underlayments, and accessories whenever possible to keep the system intact. When a specific aftermarket flashing, vent, or fastener will outperform the original or is more available for a same-week repair, we’ll recommend it and tell you why. We stock common CertainTeed repair materials for fast San Francisco turnaround, especially in leak season when the fog is thickest.
CertainTeed Service Pricing in San Francisco
CertainTeed repair pricing in San Francisco typically runs between $350 and $900 for targeted flashing or leak repairs, while a full re-roof with Landmark shingles on a small front slope generally lands between $12,000 and $22,000 depending on decking condition, hoist logistics, and whether the flat roof behind it needs work too. Flat roof patches on CertainTeed low-slope systems usually run $500 to $1,400. The big variables in this city are access, parapet flashing condition, and how much fog-driven saturation has already compromised the decking. A free estimate from us includes a full written line-item breakdown of materials, labor, hoisting, and disposal, with no change orders and no surprises on the invoice. Call (743) 200-8347 for an exact quote.
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 – CertainTeed Roofing in San Francisco
Yes. Fog delivers moisture continuously over weeks or months, not in short storm bursts like rain. On the Outer Sunset and Inner Richmond, this means CertainTeed shingles stay saturated long enough for algae to colonize and granules to loosen at the mat surface, and the wet-dry cycling at the fog edge causes micro-cracking that accelerates aging. Rain soaks a roof and dries. Fog keeps it wet. Call (743) 200-8347 to schedule a free inspection and see what the marine layer has done to your roof so far.
Because San Francisco’s flat and low-slope roofs concentrate water movement at parapet walls, sidewall intersections, and interior drains, and the chronic fog keeps those transition points damp year-round. Framing members swell and shrink, sealants lose flexibility, and the flashing metal itself corrodes faster than it would in a drier climate. The field of the roof can be perfectly fine while a flashing quietly fails.
We can. Zero-lot-line work requires hoisting materials over the front parapet rather than accessing from a side yard, and our crews are set up for exactly that. We protect the shared parapet wall, work from ladders and roof jacks on our side, and don’t touch the neighbor’s roof plane unless the shared flashing is the actual leak source. Written price first, and a written guarantee on the repair.
Not necessarily. If the Landmark shingles on the front slope are intact and the underlayment beneath them is still sealed, a targeted flat roof patch or membrane replacement is often the right call. We’ll inspect both sections, tell you honestly whether a patch will hold or if the flat section’s saturation has spread far enough to warrant full replacement, and give you a written price before any work starts. Call (743) 200-8347 for a free estimate on the flat section alone.
It can be, when it’s installed correctly on the right roof profile. Xtreme WeatherGuard is a self-adhered underlayment that seals well around fasteners when driven correctly, but on low-slope and flat transitions, over-driven fasteners wrinkle the lap edges and break the seal, creating hidden leak paths that fog saturation exploits. The material is not the problem; the installation method on San Francisco’s low-slope profiles is where it goes wrong. We install Xtreme WeatherGuard the way San Francisco roofs actually require. Call (743) 200-8347 and we’ll assess your roof before you spend on the wrong repair.
Service Areas Near San Francisco
We serve San Francisco and surrounding Bay Area communities. If you’re outside the city proper, we also offer CertainTeed service in Sacramento and CertainTeed service in Fresno through our independent Threshold Group partner locations. The same written pricing and Threshold Verified technician standards apply.
Book Your CertainTeed Service in San Francisco Today
A roof that’s doing its job is one you never think about. Let’s keep it that way. Call (743) 200-8347 to schedule your free estimate. Written price first, written guarantee on every repair, and a technician whose name and photo you’ll see before they ring the bell.
Written by Grant Whitlock, Owner at Mercer Roofing, serving San Francisco since 2000.