Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
After
Before
AfterFast, Reliable Roof Installation Across Daly City
Most roof replacements in Daly City cost between $11,500 and $24,000 for a typical Doelger-era home, with architectural shingle tear-offs on the lower end and full redecking, flashing, and ventilation work pushing toward the top. That’s the range we quote most often when we walk a Westlake or St. Francis Heights roof. If you’re calling from the fog belt along Skyline or up near Westmoor, you already know the punishment a coastal roof takes. We’re Mercer Roofing, a Roofing Company - Daly City that’s been working on Daly City’s tract houses long enough to know exactly what’s under those shingles before we lift the first one. Call (743) 200-8347 and we’ll put a written price in your hand before any work starts.
Why Mercer Roofing Is Daly City’s Preferred Roof Installation Company
Daly City homeowners call us because we tell them who’s coming to their door before that person rings the bell. Every Mercer technician is background-checked, identity-verified, and badged. We send the name and photo ahead of the visit, and the technician presents photo ID at the door. For people home alone, parents with young kids, and older homeowners, that’s the difference between dreading the knock and expecting it.
Our Roof Installation crews work the Doelger tracts constantly. We know the Westlake rowhouse roof pitch, the St. Francis wood-framed bungalows, the 1950s builds in Broadmoor where original decking is often still nailed down. That local knowledge means our quotes reflect what we’ll actually find on your roof, not a generic square-footage formula. Grant Whitlock, who leads Mercer Roofing, holds every crew to the Threshold Verified standard: uniformed, badged, background-checked, and dispatched with a written price already in hand. Every repair or installation includes our 365-Day Done Right Promise. If work isn’t right within a year, we make it right. In writing.
Roof Flashing Installation in Daly City
Roof flashing installation in Daly City is the most overlooked part of a roof job here, and on the northwest-facing planes of Doelger rowhouses it’s usually the first thing to fail. Flashing is the metal that seals the places where the roof meets a wall, chimney, skylight, or valley. In Daly City’s salt-laden fog, exposed flashing corrodes years before the shingles look worn. When we install flashing, we use materials sized for coastal exposure and seal every seam so moisture can’t wick into the wall assembly.
What gets replaced
On a typical Daly City tear-off, we replace step flashing at roof-to-wall intersections, valley flashing where two roof planes meet, pipe boots, and drip edge at the eaves. If the old flashing is galvanized steel that’s rusted through, we upgrade to a heavier-gauge metal or corrosion-resistant material rated for marine air. The cost for flashing work within a larger roof installation in Daly City typically runs $800 to $2,200 depending on how many penetrations and valleys your roof has.
Why Westlake homes need it sooner
The shallow pitch on Doelger rowhouses means water doesn’t shed fast. It ponds at valleys and sits against flashing joints. Add constant fog and wind-driven moisture, and you get the pattern our crews see weekly on Westlake homes: flashing rotted on the northwest slope while the south side still functions. We inspect every flashing point during the tear-off and include the cost in the written quote before we start. No surprise line item after the fact.
TPO Roofing Installation in Daly City
TPO roofing installation in Daly City makes the most sense on flat or very low-pitch roof sections, which show up on some 1950s commercial conversions, garage additions, and a portion of the older Broadmoor housing stock. TPO is a single-ply thermoplastic membrane that’s heat-welded at the seams, which gives it a continuous waterproof surface that handles ponding water better than shingles. For a Daly City roofline that collects fog moisture and never fully dries, a welded membrane removes the seam failures that plague shingle systems.
Where it fits
If your garage or a rear addition has a roof pitch under 2:12, shingles won’t perform. TPO gives that low slope a watertight cover. For a typical Daly City flat roof section of 400 to 800 square feet, TPO installation runs $6,500 to $12,500 depending on whether we need to remove old layers, repair decking, or add tapered insulation to fix drainage.
We handle the details
We install TPO to manufacturer spec with heat-welded seams, mechanically fastened or adhered depending on the deck, and terminated with metal edge flashing. On coastal Daly City rooftops, we also check the existing drainage and add crickets or scuppers if water is sitting against the parapet walls. Every TPO job includes a written price before work begins and the 365-Day Done Right Promise in writing.
Trusted Brands We Service in Daly City
We install and repair shingle brands Daly City homeowners actually ask for by name: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. Our crews are manufacturer-trained on GAF and Atlas systems, and we keep common shingle colors and flashing stock available for quick turnarounds on Daly City roofs. If you’ve got a partial warranty claim or need a specific architectural shingle to match the rest of a Westlake rowhouse row, we’ll order it and price it in writing before work starts. For low-slope sections, we also install TPO membranes from manufacturer-recognized lines. Call (743) 200-8347 and ask what we stock for your roof type. A live person answers.
Common Roof Installation Problems We See in Daly City Homes
- Northwest-facing planes failing years before the rest of the roof. Ocean winds drive moisture directly into the northwest slope on Doelger tract homes, so that side often needs full replacement while the south-facing side still has usable shingles. We quote the work plane by plane, not as one uniform square-footage number.
- Rotted decking hidden beneath shingles that still look fine. On 1950s Daly City row houses, the original wood decking under the shingles is often saturated from decades of fog. We open it during tear-off, document what’s there, and any decking replacement gets priced and approved in writing before we touch it.
- Failed underlayment on shallow-pitch rowhouses. The low slope on Westlake-style homes means water sits longer on the valleys and eaves. The felt or synthetic underlayment breaks down from constant moisture, and when it does, the shingles lose their waterproof barrier long before they look worn. We install ice and water shield in the valleys and along eaves on every Daly City tear-off.
- Corroded flashing from salt-laden fog. Exposed metal flashing on the northwest and ocean-facing planes rusts through from salt air, not from age. That corrosion lets water into the wall assembly and only surfaces once the decking is opened. We replace every flashing point on the affected planes and use coastal-rated metal.
Pricing for Roof Installation in Daly City, CA
Here are real numbers we quote regularly in Daly City. A full architectural shingle tear-off and replacement on a typical Doelger rowhouse (900 to 1,300 square feet) runs $11,500 to $18,500. If we’re also redecking significant sections, replacing all flashing, and adding ventilation, expect $18,500 to $24,000. A partial replacement of just the northwest plane on a Westlake home typically lands between $5,800 and $9,400. TPO on a flat garage section runs $6,500 to $12,500. Flashing-specific work within a larger job runs $800 to $2,200.
What moves the price: decking condition under the shingles, number of roof penetrations, whether the existing roof has one layer or two, and the pitch. We give you a written price before any work starts, and that price is the price. No change orders unless you approve them in writing first. Call (743) 200-8347 for a free estimate on your specific roof.
We Also Serve Cities Near Daly City
Mercer Roofing handles roof installation for homeowners in Brisbane, South San Francisco, San Bruno, and Pacifica as well. If you’re in one of those neighborhoods and wondering whether your roof is showing the same coastal wear we see throughout Daly City, call us. We coordinate scheduling and dispatch from our San Francisco Bay Area office, and crews serve each city locally. Same written price, same badged technician at your door.
Serving Daly City, CA - Our Local Coverage Area
We’re based in the Daly City 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 Installation in Daly City
The northwest-facing plane on your Westlake home takes the worst of Daly City’s ocean-driven wind and fog, so that slope degrades years ahead of the south-facing side. On a Doelger-era row house near the Westlake Shopping Center, our crew tore off the northwest plane where salt-laden fog had corroded the flashing and rotted the decking, while the south side still had usable architectural shingles. We rebuilt the valleys with ice and water shield, reset the drip edge and fascia, added a ridge vent to fix the shallow-pitch ventilation, and installed GAF architectural shingles so the whole roof matched. You don’t need to replace a good slope just because the other side is failing. Call (743) 200-8347 and we’ll walk the roof with you and quote only what’s needed.
Expect to find what we find on nearly every Doelger tear-off: wood decking that’s been wet for decades, underlayment that’s deteriorated, flashing that’s corroded, and occasionally the original electrical or framing details that a 1950s build left in place. We inspect before the replacement goes down, document what we find, and any additional work is priced and approved in writing before we proceed. The age of these homes means the roof structure itself is usually sound, but the materials on top of it are past their service life. We’ll show you exactly what we’re seeing, not describe it from the ground.
Yes, a roof permit in Daly City can trigger code requirements that didn’t exist when your home was built, including ventilation standards and, on some rowhouse configurations, fire-rated separation at shared walls. We handle the permit application, pull it in your name, and include the permit cost in your written quote. If the inspector requires an upgrade we didn’t anticipate, we price it and get your written approval before doing the work. We’ve done enough Doelger-era roofs in Daly City to know what the local inspectors look for, and we build those requirements into the initial quote rather than surprising you later. Call (743) 200-8347 for a quote that includes permits and inspection costs.
On shallow-pitch Doelger roofs, we install ice and water shield at the valleys and eaves to stop the ponding water from reaching the decking, and we add ridge or box vents to move air through the attic space. The low pitch means these roofs hold water longer than a steeper roof would, so we choose underlayment and installation details specific to that condition. For garage or addition sections under 2:12 pitch, we recommend TPO rather than shingles. The goal is a roof that dries properly from both sides, which on fog-bound Daly City homes makes the difference between a 15-year roof and a 25-year roof. Every quote includes the ventilation work we recommend, priced up front.
Look at four things: whether the decking replacement is included or left as a contingency, what underlayment and ice-and-water details are specified for the valleys and eaves, whether the quote includes flashing replacement at every penetration, and whether the ventilation upgrades are written into the scope. On a Daly City Doelger home, a bid that skips valley flashing or underlayment will need a change order as soon as the old roof comes off. We give you a written, itemized price that includes all of it before work starts, and we put our 365-Day Done Right Promise on every installation. Roof Installation with Mercer means you compare the exact same scope, not a guess. Call (743) 200-8347 for a free estimate you can set side by side with any other bid.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Daly City as part of the Threshold Group family, founded in 2000.
Get Your Written Roof Installation Estimate in Daly City
If you own a Doelger-era home in Westlake, St. Francis, Broadmoor, or anywhere else in Daly City, you already know that fog and wind are working on your roof whether or not you can see it from the street. We’ll come out, walk the roof plane by plane, and give you a written price that covers what’s actually there. A live person answers the phone 24/7 at (743) 200-8347. Call to schedule your free estimate, and we’ll send you the name and photo of the technician before they arrive. Badge at the door. Price in writing. Guarantee in force for 365 days.