Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roofing Company Across Cotati
Mercer Roofing handles roof repair, roof replacement, and full roof inspections for homeowners across Cotati. Most repairs on the aging 1960s – 80s ranch stock here run between $450 and $1,800, while a full reroof on a typical Cotati rambler lands between $11,000 and $19,000 depending on tear-off condition, decking repair, and shingle grade. We know the Petaluma Gap wind corridor better than most, because it punishes roofs here in ways Rohnert Park and Santa Rosa rarely see. Call (743) 200-8347 for a free estimate, and we’ll send a technician whose name and photo you’ll receive before they ever knock.
Why Mercer Roofing Is Cotati’s Preferred Roofing Company
Cotati homeowners call us because we treat the door the same way we treat the roof: with proof before promises. Every Mercer technician is background-checked, identity-verified, and dispatched under the Threshold Verified standard. Before a tech arrives on your street off Gravenstein Highway or near Cotati Creek, you get their name and photo on your phone. At the door, they badge in with a photo ID. That’s not a courtesy. That’s the reason a lot of parents, older homeowners, and people home alone call us first.
We’ve worked roofs along East Cotati Avenue, Page Street, and the cul-de-sacs off Madrone Avenue. The houses are similar, but the failures follow a pattern. North- and west-facing slopes in Cotati hold marine moisture through the winter. Moss mats form. Tabs lift. Then a Gap wind event peels them. We specify starter strips, ridge caps, and perimeter flashing to a wind-uplift standard that would be overkill in Petaluma proper. Here, it’s not overkill. It’s the only way a roof stays on.
Every repair includes a written 365-day guarantee. If it fails within a year, we return and make it right, free. And no work starts until you have a written price in hand. That’s the Mercer way, under the same Threshold Group quality framework since 2000. Grant Whitlock leads our roofing operations, and he holds every tech to the same standard: show up verified, price it honestly, write it down, stand behind it.
Roof Coating in Cotati
Roof Coating in Cotati is a targeted water-sealing and UV-protective treatment applied over existing roofing, most often on flat or low-slope sections, and it runs $2,800 to $6,500 depending on square footage and surface prep. For a Cotati homeowner, coating is a middle-ground option when the structure is sound but the surface is tired: hairline cracks, ponding on flat roof areas over converted porches, or granular loss that hasn’t yet opened seams. It buys years without a full tear-off, and we quote it precisely after an inspection. The estimate is free, and the price is written before any work begins.
When Coating Makes Sense
A flat roof over a Cotati carport or a low-slope addition is a chronic moisture trap in the Petaluma Gap climate. The marine fog keeps surfaces damp, and pooled water finds every weak seam. Coating realigns that surface with an elastomeric or silicone membrane that flexes with temperature shifts, which matters here because wet winters and warm inland spells cycle roofs hard. If the decking is still dry underneath, coating is the cheaper fix by a wide margin.
What the Process Involves
We pressure-clean, repair blisters and seams, then apply the coating in two passes with a fabric reinforcement at through-seams and penetrations. The work usually takes one to two days on a standard Cotati ranch. You’ll have a written price and a written 365-day guarantee before we start. No change orders unless you approve them in writing first.
Free Roof Estimate in Cotati
A Free Roof Estimate in Cotati means a Mercer technician climbs the ladder, photographs what’s actually failing, and hands you a written, line-item price before any nail is driven. We don’t quote a roof from satellite images, and we don’t give a number over the phone that quietly climbs later. The estimate is free whether or not you hire us, and it includes photos so you can see the moss mat on the north slope for yourself. Call (743) 200-8347 to schedule one.
What the Inspection Covers
Shingle condition, underlayment, flashing at chimneys and vents, starter strip integrity, ridge cap sealing, decking feel underfoot, and gutter performance. On Cotati homes especially, we look hard at moss accumulation and perimeter uplift, because those are the two things that turn a small repair into a full tear-off if ignored. You’ll get the written quote the same visit, with every line item priced.
Estimates Without Pressure
Nobody will stand in your kitchen talking you into something you didn’t ask for. The quote is yours to keep. You’ll know what a repair costs, what a replacement costs, and what maintenance buys you. If you decide the roof can wait, fine. You’ll have real numbers and real photos, not a vague range read off a tablet.
Trusted Brands We Service in Cotati
Mercer Roofing installs and repairs GAF, CertainTeed, and Owens Corning shingle systems, among others. We keep local Cotati projects moving with fast access to stock through our Bay Area supply chain, so a reroof doesn’t stall waiting on a shingle order from two states away. We’re a manufacturer-recognized installer with GAF, which means their systems on Cotati homes get the full warranty and our own 365-day workmanship guarantee layered on top. If you have a preference for CertainTeed Landmark or Owens Corning Duration, we’ll price it both ways so you can compare honestly.
Common Roofing Company Problems We See in Cotati Homes
- Moss mats on north-facing slopes that never dry out: The Gap’s marine layer keeps those slopes damp from November through April. The moss mats lift 3-tab shingle tabs just enough that wind gets under them.
- Wind-uplift at the perimeter: Starter strips, ridge caps, and drip edge specified for inland Sonoma conditions fail in the wind corridor. Once the perimeter goes, wind-driven rain tracks under shingles and into the framing.
- Thin board and early OSB decking that has absorbed decades of moisture: Many 1970s ranchers in Cotati still have their original decking under first-replacement shingles. Soft sections break under foot and let water track to the fascia.
- Moss-loosened tabs followed by a single Gap wind event: It’s the fixed two-step failure: moss lifts the tab, wind peels it. Homeowners often think they had a “sudden” leak when the process started months earlier inside the moss mat.
Pricing for Roofing Company in Cotati, CA
A targeted roof repair on a Cotati ranch runs $450 to $1,800 for typical work like replacing blown tabs, resealing ridge caps, or repairing step flashing at a chimney. A full roof replacement on the same house lands between $11,000 and $19,000 for tear-off, decking repair, underlayment, and architectural shingles. Roof coating on a flat or low-slope section runs $2,800 to $6,500. The big swing factor in Cotati is decking condition: if we find soft wood from decades of Gap moisture, every replaced sheet moves the final number. Call (743) 200-8347 and we’ll give you a written, free estimate so you know the exact figure before you decide.
We Also Serve Cities Near Cotati
Our crews serve Roofing Company clients across Cotati and into Rohnert Park, Petaluma, Santa Rosa, and Sebastopol. If you’re just outside Cotati, we can likely reach you just as quickly. Ask when you call. View our dedicated Cotati page for more on how we work here specifically.
Serving Cotati, CA - Our Local Coverage Area
We’re based in the Cotati 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 Cotati
Cotati sits directly in the Petaluma Gap wind corridor, which funnels cool, foggy marine air through the city at higher velocities than Santa Rosa. North- and west-facing slopes in Cotati rarely dry out during the winter months, creating the exact moisture conditions moss needs to colonize. Santa Rosa gets the same fog, but it burns off faster and holds less persistent moisture on shingles. The difference is real and measurable, and it changes how your roof should be maintained. If the moss is thick enough to lift tabs, call (743) 200-8347 and we’ll assess it for free.
In Cotati specifically, moss treatment is a wind-damage prevention measure, not a cosmetic preference. Local roofers see the same two-step sequence across nearly every street: north-facing slopes develop dense moss mats from the marine-layer moisture, the mats loosen 3-tab shingle tabs, and then a Petaluma Gap wind event pulls those tabs up or off entirely. Once tabs lift, wind-driven rain gets under the shingles and into the decking. Treating and gently removing moss before it mats is substantially cheaper than chasing a soft-deck repair. The free estimate will tell you whether your roof needs treatment now or can wait.
We inspect first, write allowances into the contract, and price any surprise in writing before we touch it. That’s the single biggest reason a Cotati roof quote moves: the house looks fine from the street, but behind the shingles is original thin board decking, failed underlayment, and sometimes code-upgrade work triggered once open. We don’t quote a 1972 ranch blind. On a 1972 ranch off East Cotati Avenue, our tech found the moss mats had already loosened the 3-tab tabs and the Gap winds had peeled a full run of ridge caps loose. We tore off to the original board decking, replaced the softened sections, laid ice and water shield through the valleys, then set new GAF architectural shingles with a nailed-to-spec starter strip. Eight squares, one inspection report, and a written scope before we opened anything up. That’s how every Cotati reroof starts.
Yes, specifically for wind-uplift resistance. In the Petaluma Gap corridor, a roof needs a high-wind starter strip, properly nailed ridge caps, and perimeter flashing specified for uplift conditions that don’t exist two cities inland. GAF and CertainTeed both make architectural shingles rated for high-wind zones, and we install them to the manufacturer’s high-wind spec, not the minimum. The wrong shingle on a Cotati roof fails at the edges first: ridge caps peel, drip edge bends, tabs blow. Call (743) 200-8347 for a free estimate and we’ll walk you through the options.
No, and that’s a feature, not a bug. A Cotati roof quote that skips the ladder misses the exact things that drive cost: moss mats, soft decking, failed underlayment, starter strip condition. We climb, we photograph, we probe the decking, and then we hand you a written price. The estimate is free. The photos are yours. No blind bids, no satellite guesses, no number that quietly moves once the shingles come off. If you want to know what your roof actually needs, call (743) 200-8347 and we’ll schedule the inspection.
Get Your Free Cotati Roof Estimate
Mercer Roofing serves homeowners throughout Cotati with written pricing, background-checked technicians, and a 365-day guarantee on every repair. Before any tech arrives, you’ll have their name and photo. Before any work starts, you’ll have a written price. Call (743) 200-8347 or request a free estimate today. We’ll inspect the roof, explain what we found in plain English, and leave you with a written quote you can keep whether or not you hire us.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Cotati since 2000.