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CWS Roofing: The San Francisco Owner’s Guide
If you own a home with a CWS roof in San Francisco, you’re likely dealing with a specific failure point: cracked tiles, failed underlayment at flashing transitions, or fastener blowout from decades of salt air and fog. We stock CWS-compatible roofing materials and complete most tile repairs or section replacements for $470 to $2,125, depending on the square footage and whether the underlayment has to be pulled back. The usual discovery path goes like this: a ceiling stain appears after a heavy winter rain, the owner climbs up and finds a cracked tile or missing ridge cap, and then the scramble begins to find someone who actually knows CWS product lines and will show up when they say they will.
Our crews work throughout San Francisco, including the fog-heavy corridors where CWS concrete and clay tile roofs are common. Curtis Lane has been up on enough of these roofs to tell you straight: most CWS failures are not the tile itself. It’s what’s under it.
Which CWS Models This Applies To
CWS manufactured concrete and clay roof tile for decades, and the product lines we see most often on San Francisco homes are the flat-profile concrete shingle and the low-barrel S-tile. Both were spec’d heavily in Bay Area developments during the 1980s through the early 2000s, before CWS exited the U.S. residential market. The compatibility gotcha most homeowners hit: CWS tiles have a specific side-lap channel and a longer-than-standard nail lug, which means a generic replacement tile from a big-box store will not seat correctly against the neighboring tile. The rows will telegraph, and water will find the gap.
To identify what you have, check the tile’s underside. Most CWS tile carries a stamped plant code and a week/year date mark. If that mark is gone or unreadable, measure the tile’s exposed width and the lap channel depth before calling anyone. We match by profile and age, not just by “looks close.” For most CWS roofs in San Francisco today, a quality aftermarket replacement from a manufacturer like Eagle or Boral (with matching profile and color blend) is the pragmatic choice. These are actual tile manufacturers with current production lines and real warranty backing. OEM CWS stock exists only as salvage or reclaim, and shipping reclaimed tile from a demolition yard in Phoenix or Sacramento adds cost and risk without improving the roof. We’ll always quote both paths if OEM matters to you, but for most homeowners the math favors new aftermarket tile with a documented profile match.
Styles & brands we work with
Signs Your CWS Roofing Is Failing
- Ceiling stains after a hard rain. This usually isn’t the tile leaking. Water is getting past failed underlayment at a penetration – a vent, a skylight curb, or where two roof planes meet. The tile above is often intact.
- Cracked or spalled tiles along the eaves. San Francisco’s salt air and repeated wet-dry cycles eat at concrete tile edges first. A spalled edge is a clear sign the tile’s fired surface has failed, and every spalled tile is an open path for water to reach the felt beneath.
- Granular grit accumulating in gutters. CWS tiles shed fine aggregate as they age. Some shedding is normal. A steady stream of grit in one gutter section after every rain means the tiles in that field have hit their service limit.
- Visible rust or lifted flashing at chimneys and sidewalls. This is the single most common CWS failure we repair in San Francisco. The tile lasts, but the original galvanized flashing was often installed over a single layer of felt, and once that felt turns to dust, the roof is compromised at the transition lines.
- Fastener backout or rattling tiles in high wind. The Outer Sunset and Twin Peaks corridors get real wind loading. When CWS tiles start lifting at the edges, the original nails have often corroded or pulled through the nail lug. Loose tile in a wind event is a hazard to people below.
Replacement Cost & What’s Included
For CWS-compatible roofing work in San Francisco, our repair pricing ranges from $470 to $2,125. That range covers the majority of single-section tile repair, flashing replacement, and localized underlayment work. Most simple field repairs – a dozen cracked tiles and one section of flashing – fall between $470 and $900, including materials, labor, and disposal. A larger repair involving multiple penetrations or a full chimney re-flash typically runs $1,100 to $2,125, depending on the height and access. If the underlying decking or rafters show rot, the repair price moves into the fuller re-roof range: a complete roof replacement in San Francisco runs $9,440 to $23,600.
All of our CWS-compatible roofing work follows the same rule as every other Bradford Remodeling job: a written line-by-line price before we touch the roof. The labor, the tile, the underlayment, the new flashing, the disposal fee. No number moves at the door. And because every Bradford Remodeling job sits inside the 365-Day Done Right Promise, if the repair fails within a year, we return and correct it at no charge. In writing, in your hand, before the first nail is pulled.
| Repair Type | Typical Installed Price |
|---|---|
| Minor tile repair (up to 10 tiles, one section) | $470 – $900 |
| Major section repair (multiple penetrations, re-flash) | $1,100 – $2,125 |
| Full CWS-compatible roof replacement (San Francisco) | $9,440 – $23,600 |
See the difference
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AfterDIY or Call Us?
Walking a tile roof is not a homeowner job. CWS tile gets slick in San Francisco fog, and a cracked tile under your boot can turn a small repair into a hospital visit. What you can safely do: check the ground around your home for tile fragments after wind events, watch the eaves during a rain for any water sheeting behind the gutter, and take photos of any cracked tile you can see from a ladder rested against the fascia. Do not walk the field of the roof, and do not move a tile to “take a look” at the underlayment. That tile-lifting is exactly how small problems become large ones.
If you see signs of failure, call us at (831) 610-5598. We’ll send a background-checked, uniformed technician to do the roof walk, document exactly what’s there, and give you a written price for the repair. Straight number, real scope, no surprises at close-out.
FAQs
Most CWS concrete and clay tile roofs in San Francisco last 35 to 50 years depending on exposure, with coastal fog and salt air trimming the outer half of that range for homes west of Twin Peaks. The tile itself can outlast the underlayment, which is why the felt and flashing fail years before the tile shows its age. Call (831) 610-5598 if you need an honest condition read on a CWS roof approaching that window.
No – a cracked concrete tile cannot be glued back together in a way that holds water out for the long term; the crack always tracks water to the underlayment. The correct fix is a profile-matched replacement tile seated into the existing lap channel. We stock the common CWS profiles and blend colors on site, which keeps most single-tile swaps under an hour.
A standard single-section repair, including tile replacement and flashing work, is done in one visit, typically half a day from setup to cleanup. A larger multi-section repair with underlayment replacement may run two working days once materials are staged. Call (831) 610-5598 and we’ll give you a written timeline with the quote.
We stock the two flat-profile and S-tile CWS profiles most common on San Francisco homes, along with the matching ridge caps and a range of color blends, on our trucks crossing the city most weeks. For older or odd-lot CWS colors, we source from regional reclaim yards and factor that lead time into your written quote up front. That means no re-priced surprise when the tile actually arrives.
Call Bradford Remodeling Co San Francisco
If you have a CWS roof issue in San Francisco, call (831) 610-5598. A live person answers, 24/7. We’ll schedule the inspection, walk the roof with you or without you, and hand you a written price before any work begins. We are an independent contractor and are not affiliated with CWS, but we know these roofs and we stand behind the repairs we make on them, in writing, for a full year.
Written by Curtis Lane, Owner, Bradford Remodeling Co – San Francisco, CA at Bradford Remodeling Co San Francisco, serving San Francisco and nearby areas.
