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CGI Roofing: The San Francisco Owner’s Guide
CGI roofing parts in San Francisco are typically available same-week through our supplier network, with most replacements installed for $470 – $2,125 depending on the specific component and roof access. Most homeowners discover a CGI roofing failure the way you probably just did: a water stain on the ceiling, a shingle in the yard after last week’s wind, or a drip that only shows up when the fog rolls in heavy off the Pacific. The good news is that CGI parts are still manufactured and readily sourceable, and we stock the most common failure points on our trucks for quicker turnaround.
What we’re about to walk through is specific to CGI roofing: how to identify what you have, what actually fails first, what a fair replacement costs in San Francisco, and when it’s smarter to call someone than to climb up yourself. Graham Stein has been on Bay Area roofs long enough to know that a Sunset District home faces different wear than a place in Noe Valley, and that the salt air and fog do real work on flashing and fasteners over time.
Which CGI Models This Applies To
CGI roofing covers two main categories: their metal roofing panels and their shingle lines. The metal side includes standing seam panels, corrugated panels like the CGI 7/8″ and CGI 1-1/4″ profiles, and their StoneCrest steel shingle system. On the shingle side, CGI’s asphalt lines are manufactured under their parent company brand and often get confused with other labels, so we always check the packaging markings or the backside print on a pulled shingle before ordering a match.
Here’s the compatibility gotcha that catches a lot of San Francisco homeowners: CGI panel profiles are not interchangeable. A 7/8″ corrugated panel will not mate correctly with 1-1/4″ trim or flashing pieces. If you buy the wrong profile’s ridge cap or rake trim, the lap won’t seat, water finds its way under, and you’ve spent money on a part that doesn’t protect anything. We ask clients to send us a photo of the panel profile before we quote, or we pull a single panel edge during our inspection and match it against the CGI profile gauge we keep in the truck.
For the StoneCrest line, each shingle is stamped with the CGI name and a date code on the underside. Date codes tell us whether you have the first-generation panel with the narrower interlock or the second-generation with the reinforced side seam. That matters because aftermarket underlayment and closure strips are made for the second-gen profile, and pairing them with first-gen panels creates a small gap at the heel that invites wind-driven rain in a place like the Richmond District where sideways rain is common. We also work with other named brands in our broader remodeling work including KraftMaid, Cambria, and Silestone, but for roofing, CGI compatibility is the only thing that matters when matching parts.
One note on sourcing: Elmstead Remodeling San Francisco is an independent service provider and not affiliated with CGI. We order directly through authorized CGI distributors, which means every part we install carries the manufacturer’s long-form warranty, not a third-party imitation.
Styles & brands we work with
Signs Your CGI Roofing Is Failing
Here are the five failure signs we see most often on CGI roofs in San Francisco, and what each one actually means:
- Lifted or flapping panel edges near the eave line. This almost always starts as a fastener failure. The original screws and washers were rated for a 20-year service life, and in the salt-heavy air near Ocean Beach or the Presidio, we regularly see washer gaskets break down in half that time. The panel itself is usually fine; the hold-down is gone.
- Dark streaking below seams or around screws. Not necessarily a leak yet. It’s often the rubber washer oxidizing and leaving residue. But it predicts where leaks will form, because the washer is the last barrier protecting the screw hole.
- Water stains on ceilings directly under a valley or dormer junction. CGI valley flashing is the first metal component to fail because it carries the most water volume during a San Francisco winter. When a valley piece rusts through or the sealant at the seam breaks down, the leak shows up quickly and consistently.
- Granule loss from an asphalt shingle line, with bare patches visible from the ground. San Francisco’s temperature swings are relatively mild compared to inland California, but UV exposure near the coast is still intense. CGI asphalt shingles typically shed granules slowly for years, but if you see bare fiberglass matting, the shingle’s protective layer is gone and replacement should happen before the rainy season.
- Rust blooms at the base of a chimney flashing or skylight curb. This is the classic fog-belt failure. Close to the water, chimney flashing rusts from the outside in, and by the time you see the bloom, the metal is thin enough that a good wind gust can tear it.
See the difference
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AfterReplacement Cost & What’s Included
CGI roofing repair in San Francisco runs from $470 for a minor fastener replacement and reseal up to $2,125 for a section of damaged panel or valley flashing replacement with trim work. Full roof replacement on a CGI metal roof falls in the $9,440 – $23,600 range, which reflects the cost of the panels, new underlayment, flashings, and the labor of a crew that knows how to unzip and re-lay metal without bending it.
What drives the range on a parts replacement specifically:
- Roof access. A single-story Sunset District bungalow with a walkable pitch is faster than a three-story Russian Hill row house where the roof is reached by ladder and the walk surface is steep.
- Part type. Replacing four screws and resealing a seam is under $500. Replacing a 10-foot valley flashing piece with custom bending is over $1,500 once you factor in the material, removal of the old piece, and the sealant work.
- What we find underneath. About 30% of San Francisco roof repairs reveal rotted decking or deteriorated underlayment once we open the area. We photograph it, show you the photo, and give you a written add-on price before we proceed. Nothing gets installed without you knowing the number first.
Every repair includes the parts, the labor, disposal of the old material, and our workmanship warranty. The written price we give you before the job starts is the price you pay at the end, unless you approve a change in writing. We price it that way because families in neighborhoods from the Outer Sunset to Glen Park have told us they want certainty, not a surprise invoice.
DIY or Call Us?
If you want to look at the roof yourself, here’s what’s safe: standing at ground level with binoculars and checking for lifted panel edges, missing screws, or rust streaks. Photograph what you find. That much helps us quote accurately over the phone.
What we don’t recommend is climbing a wet roof in San Francisco fog, leaning over a ridge line, or pulling fasteners out to “look at them.” Roof work on a multi-story home with steep pitches is dangerous enough that we carry full fall-protection gear on every job, and our crew wears it. A CGI panel edge is also sharp enough to cut through work gloves, and a freed panel in a gust of wind can move fast. If the repair involves anything beyond a ground-level trim nail pop, call us at (831) 480-4497 and we’ll get on the roof so you don’t have to.
FAQs
A properly installed CGI metal roof lasts 40 – 60 years in San Francisco, though the fasteners and rubber washers typically need servicing every 15 – 20 years due to coastal moisture and fog. The panels themselves hold up well; it’s the connections that wear first. Call (831) 480-4497 and we’ll inspect the fasteners as part of any service visit.
Fasteners, sealant, and small flashing pieces can be repaired or resealed without full replacement, and that’s the most common repair we do. Large rusted panels or perforated valley flashing usually need replacement because patch material won’t bond reliably to corroded metal. We’ll show you photos of what we found before recommending either path.
Most single-part replacements take 2 – 4 hours on site, including setup, the repair work itself, and cleaning up afterward. If we’re replacing a valley or a panel section, it’s typically a half-day job. We’ll give you a written time estimate with the quote.
We stock the common failure points on our trucks: replacement screws with the correct gasket washers, closure strips, seam sealant, and standard trim profiles for the 7/8″ and 1-1/4″ CGI panels. Less common parts like StoneCrest shingles or custom-bent valley pieces come from our authorized CGI distributor, usually within three to five business days in San Francisco. Call (831) 480-4497 with a photo of your roof and we’ll tell you which category you’re in.
Tell me what the room needs to do, and we’ll figure out the rest from there. If your roof is leaking or a panel has torn loose, the first step is a free estimate at (831) 480-4497. We’ll look at the roof, write you a price, and leave you with a clean walkway and a clear answer.
Written by Graham Stein, Owner, Elmstead Remodeling San Francisco at Elmstead Remodeling San Francisco, serving San Francisco and nearby areas.
