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 El Granada
Roof installation in El Granada means dealing with a specific set of coastal conditions that most Bay Area roofers rarely see: salt-laden marine air, near-daily fog, and low-pitch resort-era homes that hold moisture long after the fog burns off. A full replacement here typically runs $14,000 – $28,000 depending on decking condition, pitch, and material choice, with most El Granada jobs landing between $16,000 and $22,000. Call (743) 200-8347 for a written estimate before you commit to anything.
We dispatch crews to El Granada from our Bay Area office, and our technicians know the Alhambra grid streets, the ranch infill off Coronado, and the hillside homes above Avenue Alhambra. Every visit starts with a written price. Every technician arrives in uniform, with a photo ID badge, and you get their name and photo before they show up at your door.
Why Mercer Roofing Is El Granada’s Preferred Roof Installation Company
The homes on El Granada’s original 1908 Alhambra grid were never built for year-round coastal saturation. They were platted as seasonal beach cottages. That single fact shapes almost every roof installation we do in this town: low slopes, shallow rafter bays, decking that has been quietly wicking moisture through moss-root intrusion for years before the shingles show obvious wear. Most roofers from the inland side of Highway 92 don’t expect that. We do.
El Granada homeowners keep calling us back for three reasons. First, the written guarantee on every install: 365 days, in writing, with a free second visit if the work isn’t right. Second, our Roof Installation team always prices decking replacement, flashing upgrades, and underlayment in the contract as allowances, not surprises, so when we open up a 1920s cottage and find rotted valleys, you already know what the repair will cost. Third, the Threshold Verified standard: every technician is background-checked, identity-verified, and badged at the door. You know exactly who is walking onto your property before they arrive.
Scheduling for El Granada runs efficiently because crews serve the Coastside as a regular route, not an occasional drive. We stock common roof installation materials locally, including stainless fasteners, GAF starter strip, and ice and water shield, so typical installations don’t stall waiting on a supply run over the hill. Founded in 2000 and part of the Threshold Group family, Mercer Roofing is led by Grant Whitlock, and we answer the phone with a live person, 24/7. Not a voicemail.
Tile Roof in El Granada
Tile roof installation in El Granada comes with a set of structural and environmental considerations that differ from shingle work. The original Alhambra-era cottages were engineered for lightweight shingles or wood shake, not the dead load of concrete or clay tile. When a homeowner on those low-slope streets wants tile, we first verify that the rafters and decking can carry the additional weight, because many shallow-pitch roofs from the 1920s and 1930s simply cannot without reinforcement. On the 1960s – 1980s ranch stock, where framing is sturdier, tile is often a strong fit for El Granada’s salt and fog environment, since clay and concrete shed moss more readily than asphalt and hold up longer against marine air. A tile roof installation in El Granada generally runs $28,000 – $55,000 depending on tile type, decking condition, and whether structural reinforcement is needed.
Structural Assessment Before Tile
Opening up an older El Granada roof before tile installation often reveals decking that has been silently compromised by years of fog-cycle moisture. We inspect the framing, the decking, and the roof-to-wall connections before quoting tile, because adding 600 to 1,000 pounds per square on a roof that was never designed for it creates long-term sag and leak risk. Structural reinforcement, when required, gets written into the contract as a line item, with the exact scope and cost approved before any work starts.
Fastener and Flashing Selection
Tile roofs on the Coastside fail at the flashings long before the tile itself wears out. Salt spray off the open Pacific oxidizes galvanized metal at a pace that would surprise anyone from Burlingame or Millbrae. We spec stainless steel or coated hardware on tile installations in El Granada, including at ridge cap, rake, and valley intersections. That is not an upgrade. It is what the environment requires.
Roof Ventilation in El Granada
Roof ventilation in El Granada is not an add-on; it is the difference between a roof that lasts fifteen years and one that rots from the inside out in ten. The marine layer is effectively permanent here. Roofs can go days without drying between fog events and rain, and when warm air from the living space hits a cold, saturated roof deck, condensation soaks the sheathing and feeds moss from below. A roof installation in El Granada that ignores ventilation is installing a future decking replacement. We calculate intake and exhaust ventilation for every job, sized to the specific attic volume and roof pitch of the home. Ventilation work during installation typically runs $1,200 – $3,500 depending on attic size and the number of intake and exhaust units required.
Intake and Exhaust Sizing
On the shallow attic cavities common to Alhambra-era bungalows, balance matters more than total airflow. Too much exhaust without adequate intake pulls conditioned air from the living space and creates negative attic pressure, which draws damp marine air into the assembly. We use a 1:150 ventilation ratio as the baseline, then adjust for the low rafter bays and minimal overhangs typical of the older El Granada grid. Continuous soffit vents at the eave paired with ridge or box vents at the high point is the most common configuration we install.
Moisture and Mold Prevention
When we install a ventilated roof on a fog-exposed El Granada home, we are also addressing what happens under the decking: mold growth, saturated insulation, and rusting fasteners. In many older Coastside homes, the attic insulation has been soaked by years of condensation and is doing almost nothing thermally. We commonly recommend replacing water-damaged insulation during a roof installation, and we price that as part of the initial written estimate. No surprises after the old roof comes off.
Trusted Brands We Service in El Granada
We install and repair roofing from GAF, CertainTeed, and Owens Corning, all of which manufacture products suited to El Granada’s coastal exposure. GAF Timberline shingles with Advanced Protection shingle technology hold up well in wind-driven rain, which matters on the exposed rakes of ranch homes near the bluffs. CertainTeed’s Landmark line resists algae growth, a real advantage when fog keeps roofs damp for days. Owens Corning Duration shingles use a woven fabric strip that reduces blow-off risk on steep and wind-exposed slopes. For El Granada customers, we carry common starter strip, ridge cap, and underlayment locally so installation doesn’t stall. We also service IKO for homeowners with existing IKO systems who need replacement sections matched.
Common Roof Installation Problems We See in El Granada Homes
- Rotted decking under visually decent shingles. On the original Alhambra grid streets, low-slope roofs hold moisture in the valleys and behind the eaves. By the time shingles show grain loss or cupping, the plywood below has often been decaying for years from moss-root intrusion and fog-cycle saturation.
- Corroded flashing and fasteners at rakes and eaves. Salt-laden marine air strips the zinc coating from galvanized drip edge and exposed nail heads years ahead of inland schedules. We regularly see flashing that looks decades older than the roof it sits on.
- Wind-driven rain penetration on ranch-era homes. The 1960s – 1980s ranch stock near Coronado and the upper hillsides sits more exposed to winter storm surf than many homeowners expect. Without proper ice and water shield at the eave and rake edges, wind can drive water under the shingles and into the wall-to-roof connection.
- Inadequate ventilation creating condensation damage. Many older El Granada homes have little or no ridge or soffit venting. The combination of warm attic air and cold, damp decking from the marine layer produces condensation that soaks insulation and feeds mold inside the roof assembly.
Pricing for Roof Installation in El Granada, CA
A full shingle roof installation in El Granada typically runs $14,000 – $28,000. The range reflects what we find once the old roof comes off. Homes on the 1908 Alhambra grid with original low-slope decking often need decking replacement and biological growth remediation, which pushes the job toward the higher end. Ranch-era homes with standard 4:12 or 5:12 pitches and sound decking often land between $14,000 and $19,000. Tile roofs run $28,000 – $55,000. Ventilation upgrades run $1,200 – $3,500. Every job includes a written price before any work starts, with no change orders unless we discover something the inspection couldn’t see, and then it is priced and approved in writing before we touch it. Call (743) 200-8347 for a free, written estimate.
We Also Serve Cities Near El Granada
In addition to El Granada, our crews serve Half Moon Bay, Pacifica, and Burlingame on a regular schedule. If you are just over the hill in Millbrae or closer to the water in Princeton-by-the-Sea, we can likely schedule your roof installation in the same week as other Coastside jobs, which keeps logistics efficient and pricing predictable for everyone.
Serving El Granada, CA - Our Local Coverage Area
We’re based in the El Granada 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 El Granada
The oldest homes on the Alhambra grid were built as seasonal beach cottages with low-slope roofs and shallow rafter bays. The marine layer keeps the roof surface damp for days between fog events, which allows moss and lichen to root into the shingle mat and, over time, into the underlayment and decking below. By the time surface shingles show visible wear, the decking has often been silently rotting for years. When we open up a roof in El Granada’s original grid, we price decking replacement as an allowance in the contract, not a surprise change order, so you know the cost before work starts. Call (743) 200-8347 for an exact quote.
Stainless steel or coated hardware is the standard on El Granada roofs, not an upgrade. Salt-laden marine air off the open Pacific oxidizes galvanized drip edge, ridge cap, and exposed fasteners years ahead of inland schedules. We spec stainless or polymer-coated fasteners, stainless flashing at valleys and penetrations, and UV-stable plastic or coated metal vent caps. A homeowner can extend the life of a new El Granada roof by ten years simply by refusing galvanized anything. We include that hardware as standard in every written estimate.
We write allowances into the contract for the most common code-triggered items on El Granada homes: outdated wiring in the attic, undersized framing, and missing fire blocking at roof-to-wall intersections. When we open a roof and find something the inspection couldn’t see, we photograph it, price the repair in writing, and get your approval before any additional work happens. No work starts until you sign off on the change order. That is the difference between a contractor who protects your budget and one who surprises you with an invoice. Call (743) 200-8347 to schedule an inspection.
We install ice and water shield at the eaves, rakes, valleys, and around all penetrations, with synthetic underlayment across the remaining field of the roof deck. In El Granada’s wind-driven rain and fog-saturation environment, self-adhered membrane at the eave and rake is the only reliable defense against wind blowing water under the shingles and into the wall-to-roof connection. On the original low-slope Alhambra homes, we often extend ice and water shield further up the roof plane than code minimums require, because the shallow pitch means water moves slowly and lingers. The cost of that membrane is included in your written estimate.
Yes. Every roof installation we do in El Granada includes a ventilation assessment and, in most cases, ventilation upgrades. The persistent marine layer means a roof without balanced intake and exhaust ventilation will collect condensation on the underside of the decking, which feeds mold and rots the sheathing from inside. We calculate intake at the soffit and exhaust at the ridge or high point, then price the entire ventilation scope before installation begins. If your attic insulation has been saturated by years of condensation, we also bid its replacement in the initial written estimate. Call (743) 200-8347 and we will walk you through what your roof actually needs.
Contact Mercer Roofing in El Granada
Before you commit to any roofer in El Granada, get a written price and a written guarantee. Our 365-Day Done Right Promise means if the installation is not correct within a year, we make it right at no charge. Every technician who arrives at your door is background-checked, identity-verified, wearing a marked uniform, and carrying photo ID, and you receive their name and photo before they arrive. That is the Threshold Verified standard, and it is the reason El Granada homeowners have trusted us since 2000. Call (743) 200-8347 today for a free written estimate on your roof installation in El Granada, CA.
Written by Grant Whitlock, Owner at Mercer Roofing, serving El Granada and the San Mateo Coastside since 2000.