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 Fairfax
Roof installation in Fairfax costs between $14,000 and $42,000 for a full tear-off and replacement on a typical 1,200 to 2,200 square foot home, with most jobs landing in the $18,000 to $28,000 range once decking repairs and fire-zone upgrades are factored in. That’s a real number, not a teaser, because we walk every Fairfax roof before we quote it. We know the valley, the canopy, the skip-sheathing, and the code triggers that turn a simple reroof into something more. Call (743) 200-8347 and our Roof Installation team will put eyes on your roof and a written price in your hand before any work starts.
Nobody should have to wonder who’s knocking. Every Mercer Roofing technician sends their name and photo ahead of the visit, badges in with a photo ID, and hands you a written price before a single shingle comes off. That’s how we work in Fairfax – calm, specific, and never pushy.
Why Mercer Roofing Is Fairfax’s Preferred Roof Installation Company
Homeowners looking for a Roofing Company in Fairfax call us because we tell the truth about what’s under the old roof before we quote it. We’ve torn off enough wood shake on Cascade Drive and Wreden Avenue to know what’s hiding underneath: rotted skip-sheathing, matted redwood needles wicking moisture into the deck, and flashing that gave up years ago. We don’t guess. We inspect, pull back a test section when the homeowner approves it, and then write numbers you can plan around.
Every estimate includes a line-item allowance for the decking and code work an older Fairfax home typically needs. That means when we find rot behind the dormer on a hillside lot off Bolinas Road, the cost doesn’t ambush you mid-job – it comes out of an allowance you already approved. If it exceeds that allowance, we stop, explain what we found with photos, and get your written sign-off on the new number before we touch it. No one in Fairfax should find out their roof price changed after the dumpster arrived.
Grant Whitlock leads our crews, and he’s held every project to the Threshold Verified standard since before it had a name. Background-checked technicians. Photo badges. Clean uniforms. A 365-Day Done Right Promise in writing on every job. When a Fairfax homeowner tells us they’re nervous about strangers working above their bedroom, we don’t argue – we just send the tech’s photo first and badge them at the door.
Roof Flashing Installation in Fairfax
Roof flashing installation in Fairfax is the difference between a roof that sheds the valley’s damp and one that lets it in. Flashing – the metal pieces that seal the joints where your roof meets a chimney, dormer, skylight, or valley – takes a beating here. Fairfax’s fog and rain run into those seams for weeks at a stretch. When old flashing fails, water doesn’t announce itself with a stain on the ceiling; it sits in the deck and rots it from inside. On a hillside bungalow with original skip-sheathing, that rot spreads fast and quiet.
Count on $800 to $2,400 for standard flashing replacement around a chimney or skylight during a reroof in Fairfax. If we’re doing a full tear-off, new flashing at every penetration is part of the scope – written into the price, never an afterthought. On a roof we’re not replacing, a flashing repair typically runs $350 to $900 per penetration depending on what’s behind it.
Where Fairfax Roofs Leak First
The valley behind a dormer on a tree-covered Fairfax lot is where we find most flashing failures. Redwood needles pile up, hold moisture against the metal, and accelerate corrosion on older galvanized flashing. We see it every season. Our fix is new rust-resistant flashing bedded in roof cement and sealed with proper underlayment, not a tube of caulk.
Reused Flashing Is a False Economy
When a roof is torn off, some crews try to reuse old flashing to save a load trip. We don’t. On a Fairfax hillside where staging is already tight, the temptation is real, but reusing 40-year-old flashing on a new roof means you’ve built a 25-year roof with 5-year seals. New flashing, every penetration, every time.
TPO Roofing Installation in Fairfax
TPO roofing installation in Fairfax makes sense for the growing number of low-slope additions, studios, and carports on canyon lots where a pitched roof isn’t practical. TPO – thermoplastic polyolefin – is a white, heat-welded single-ply membrane that reflects the valley’s occasional intense summer sun and stands up to months of damp without absorbing water. For a flat or low-slope section, it’s often the right material where standing water is a possibility.
A TPO roof installation in Fairfax on a 300 to 600 square foot low-slope roof typically runs $6,000 to $13,000 including tear-off of the old material, new cover board, and membrane installation. Smaller detached structures – a garage or studio – land closer to the low end. The Fairfax variable is slope: many canyon additions have just barely enough pitch to drain, so we verify the drainage plane and add tapered insulation where needed before the membrane goes down.
Why TPO Works in a Damp Valley
TPO doesn’t feed moss the way old built-up roofs and modified bitumen do. Its white surface dries quickly once the fog burns off, and it doesn’t hold organic matter the way granular surfaces do. For a Fairfax homeowner tired of scraping moss off a flat porch roof every spring, that’s the practical win.
Seams Are Where the Leak Tries
TPO performance lives or dies on the seams. We heat-weld every seam, not glue them. A glued TPO seam under a redwood canopy will open. A welded seam will not. We also detail every penetration with manufacturer-specified boots and flashing, because a Fairfax roof that leaks around one vent isn’t a roof.
Trusted Brands We Service in Fairfax
We install GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral systems, and we stock the parts Fairfax homeowners actually need close at hand – GAF architectural shingles for the fire-rated replacements, Atlas and Tamko options when a specific color needs to match a hillside aesthetic, and Boral tile for owners who want a heavier, higher-end look. If a crane can’t reach your lot, we stage materials by hand. Same materials, same warranty, just more work we’ve already planned into the quote. No load-trip games.
Common Roof Installation Problems We See in Fairfax Homes
- Rotted skip-sheathing under old wood shake. Original 1940s and 1950s roofs often have plank decking with wide gaps. Redwood needles work into those gaps, hold water against the wood, and rot it before you ever see a stain on the ceiling. We rebuild the deck properly before the new roof goes on.
- The Chapter 7A fire-zone trigger. Much of Fairfax sits in a State Responsibility Area fire hazard severity zone. A reroof here legally requires a Class A fire-rated assembly under California Title 24 Chapter 7A – no like-for-like wood shake replacement. We walk you through what that means on your specific roof, in writing, before the bid.
- Failed flashing at dormers and valleys. Canopy shade keeps these seams damp for days after any rain. Galvanized flashing corrodes, sealant shrinks, and water follows. This is the most common genuine leak source we repair on Fairfax homes.
- Tree-hemmed lots that punish shortcuts. Tight hillside driveways off Cascade and Wreden mean staging materials is genuinely hard. Some crews cut corners on drip edge, underlayment, or proper flashing to save trips. We don’t, because in this valley those are the details that decide whether a roof lasts 8 years or 25.
Pricing for Roof Installation in Fairfax, CA
Plan on $14,000 to $42,000 for a full roof replacement in Fairfax. A straightforward tear-off and architectural shingle install on a modest bungalow runs $14,000 to $19,000. The same roof in the fire-zone with decking replacement, Chapter 7A materials, and hill access runs $22,000 to $35,000. High-end tile or steep canyon lots with limited access push toward the top. Our quotes always include written allowances for rot repair and code upgrades so the number doesn’t move on you. Call (743) 200-8347 for a free, written estimate.
We Also Serve Cities Near Fairfax
Our crews serve Roof Installation in Fairfax and the surrounding Marin communities: San Anselmo, Kentfield, San Rafael, and Larkspur. Each town has its own roof conditions – San Anselmo’s flatland sun exposure differs from Fairfax’s shaded canyon – and we quote accordingly. If you’re in one of those towns and want the same written-price, badge-at-the-door standard, we’ll send a tech out.
Serving Fairfax, CA - Our Local Coverage Area
We’re based in the Fairfax 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 Fairfax
Because much of Fairfax is mapped as State Responsibility Area fire hazard severity zone, California Title 24 Chapter 7A requires any reroof to use a Class A fire-rated assembly – which excludes wood shake. You’ll need a fire-rated shingle, tile, or metal system instead. We explain the exact requirement for your parcel during the estimate. Call (743) 200-8347 and we’ll walk you through it.
We write a line-item allowance for decking, flashing, and code work into every Fairfax quote before we start. If we find rot behind a dormer or failed flashing under the old shake, we document it with photos, explain what’s needed, and get your written approval before we touch it. If the cost exceeds the allowance, you approve the new number first – in writing. No surprise invoices. Call (743) 200-8347 for a quote that plans for what Fairfax roofs actually hide.
Fairfax’s redwood and bay laurel canopy drops needles into valleys, behind dormers, and along eave lines. Those needles mat down, wick moisture, and rot original skip-sheathing for years before interior damage shows. We clear debris and inspect the deck on every Fairfax job we run – it’s a standing line item, not an upsell. Call (743) 200-8347 to schedule an inspection.
Yes. In Fairfax’s fog-funneled valley, roof surfaces stay damp for days after a storm, and moss and lichen establish quickly. They lift shingle edges, trap water against the roof surface, and can compromise materials within five to seven years without preventive treatment. We’ll tell you honestly whether what you’re seeing is cosmetic or structural. Call (743) 200-8347 for a straight assessment.
We survey the access before we quote. On lots where a roof-loading truck can’t reach, we hand-carry materials up the slope and stage them safely. This adds labor, and we price it honestly in the bid – no hidden surcharge when the truck can’t make the turn. If the ground is too steep, we’ll tell you that too and plan around it. Call (743) 200-8347 and we’ll assess your specific access.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Fairfax, CA.
Call (743) 200-8347 today to schedule your free estimate. A live person answers around the clock – not a voicemail, not a form. We’ll send a background-checked technician with a photo badge to your door in Fairfax, and you’ll have a written price before any work begins.