Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
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Before
AfterFast, Reliable Roof Installation Across Pasadena
A full roof installation in Pasadena typically runs $14,000 to $32,000 depending on roof size, material, and whether your home sits in a historic district or the foothill fire zone. Most projects take one to three weeks from tear-off to final inspection, though Bungalow Heaven and other landmark-protected neighborhoods can add two to four weeks for design review. We coordinate the approvals, the materials, and the crew so you’re not chasing paperwork across two city departments. Call (743) 200-8347 for a written estimate before anything gets scheduled.
Why Mercer Roofing Is Pasadena’s Preferred Roof Installation Company
Pasadena homeowners deal with a roofing market that most out-of-area contractors don’t understand. The city’s historic preservation ordinances and its Very High Fire Hazard Severity Zone requirements pull in opposite directions: one demands period-appropriate materials, the other demands Class A fire-rated assemblies. We’ve installed roofs that satisfy both, and we know which composite tiles and shingles clear design review without a second rejection letter.
Grant Whitlock leads our Pasadena installations, and every technician who steps onto your property arrives in a clean, marked uniform with a photo ID badge. We send the name and photo of your technician before the visit so you know exactly who’s at the door – no surprises, no strangers. That’s the Threshold Verified standard, and every Mercer location is contractually held to it. Part of the Threshold Group family since 2000, we’ve built our Pasadena reputation on written prices before work starts and a 365-Day Done Right Promise on every installation.
When you call, a live person answers – 24/7, not a voicemail tree. For Pasadena homeowners coordinating historic approvals and fire-code compliance, that matters. You get answers when you need them, not a callback tomorrow.
Roof Installation with Mercer means you’ll always see the full written price before a single nail is driven. Every repair and installation carries a written guarantee; if a repair fails within 365 days, a second visit is free.
Roof Flashing Installation in Pasadena
Roof Flashing Installation in Pasadena means replacing the metal barriers at every penetration – chimneys, skylights, vents, valleys, and wall intersections – before they channel water into the sheathing. On the pre-WWII Craftsman and Spanish Colonial homes that define Pasadena‘s older neighborhoods, original flashing was often galvanized steel that has corroded through after 80 to 100 years of thermal cycling in the San Gabriel foothill basin heat. Flashing replacement alone typically runs $1,800 to $4,500 in Pasadena, depending on how many penetrations your roof has and whether the surrounding underlayment also needs repair.
Where Flashing Fails First on Older Pasadena Roofs
The leading failure point on Pasadena’s historic homes is at the chimney and sidewall step flashing. Original copper and galvanized flashing was rarely replaced when a re-roof happened, and the 10-15°F hotter basin temperatures accelerate metal expansion and contraction, pulling fasteners loose over decades. We routinely find flashing that looks intact from the ground but has separated from the wall behind the stucco or brick veneer, letting water run behind the siding for years before anyone notices.
When we install flashing on a Pasadena home, we inspect the underlayment underneath it and write any needed membrane repair into the contract before work begins. That means a written allowance, not a surprise line item after tear-off.
TPO Roofing Installation in Pasadena
TPO Roofing Installation in Pasadena is common on the flat and low-slope sections of mid-century ranch homes, rear additions, and garage roofs throughout the city. TPO – thermoplastic polyolefin – is a heat-welded single-ply membrane that reflects UV heat, which matters when Pasadena runs 10-15°F hotter than coastal LA and air conditioning bills follow the sun. A typical TPO installation on a Pasadena flat roof runs $6,000 to $12,000 depending on square footage, insulation needs, and whether the existing roof has ponding water or saturated decking.
Why Pasadena Heat Favors TPO Over Older Flat-Roof Systems
Built-up gravel roofs and aging modified bitumen absorb basin heat all day and radiate it into the house all night. TPO’s reflective white surface lowers surface temperature by a measurable margin and welds into a single continuous membrane. For a Pasadena homeowner with a flat rear addition over a bedroom or a converted sunroom, that translates into a cooler space during the July-through-October stretch.
We install TPO over a full inspection of the decking and insulation. If the deck has rotted from ponding water – common on flat roofs with old, clogged drains – the repair gets priced in writing and approved by you before we touch it.
Trusted Brands We Service in Pasadena
We install and maintain roofing systems from GAF, CertainTeed, Owens Corning, and Atlas, among other manufacturer-recognized brands. For Pasadena’s historic districts, we stock composite shake and tile profiles that clear design review while carrying Class A fire ratings – critical for foothill neighborhoods where the fire marshal’s office signs off on every roof assembly. Because we’re regularly on Pasadena job sites, we keep common flashing profiles, underlayment, and TPO membrane stock accessible for fast turnaround on repair work. No waiting two weeks for a specialty order when a Santa Ana wind event tears a valley or lifts a ridge cap.
Common Roof Installation Problems We See in Pasadena Homes
Opening up an older Pasadena roof often reveals what decades of heat, wind, and deferred maintenance have done under the surface. Here’s what we regularly find and how we handle it:
- Failed underlayment and waterproofing under old wood shake. On a 1923 Craftsman bungalow off North Marengo in Bungalow Heaven, we stripped the original wood shake and found the waterproofing had broken down to dust. We wrote a new ice and water shield spec into the contract as an allowance, priced the surprise in writing, got the owner’s approval, then set a Class A composite tile that mimics 1920s shake well enough to clear design review.
- Undersized rafter framing on pre-WWII roofs. Many original rafters were sized for wood shake, not modern tile or composite. Adding dead load without sistering can crack plaster ceilings and sag the ridge. We inspect framing before ordering materials and price any structural repair as a written allowance, not a change order shock.
- Tile and shake failing at the fasteners, not the field. Santa Ana and Diablo winds funneling off the San Gabriels produce uplift that dislodges improperly fastened or aged clay tile. The roof surface looks fine, but the fasteners have loosened over decades of wind cycling. A post-wind-event inspection catches it before the next big blow sends tiles into the yard.
- Heat-degraded asphalt products on ‘same-spec’ replacements. The thermal-basin heat cooks asphalt and polymer materials past their rated lifespan. A homeowner replaces an architectural shingle roof with the same spec, skips adding ridge vent and soffit intake, and wonders why it fails on the same schedule. We address ventilation at the time of installation, not as a separate upsell.
Pricing for Roof Installation in Pasadena, CA
A full re-roof on a typical Pasadena bungalow runs $14,000 to $24,000 for architectural asphalt, $22,000 to $32,000 for composite tile or standing seam metal, and $6,000 to $12,000 for TPO on a flat section. What moves the number: your home’s historic district status and the material the Preservation Commission will approve, whether the fire marshal requires a Class A assembly (foothill blocks do), the condition of the decking and framing once we open it up, and the number of penetrations needing new flashing. We write allowances for framing repair and waterproofing into the contract before tear-off, so the price you sign is the price you understand – and any surprise is priced and approved in writing before we touch it. Call (743) 200-8347 for a free estimate and a written line-item quote.
We Also Serve Cities Near Pasadena
Beyond Pasadena, our crews cover San Marino, South Pasadena, Altadena, and San Gabriel. Each has its own mix of historic housing stock and fire-zone overlap, and we bring the same inspection-first, written-price approach to every project. If you’re nearby, call (743) 200-8347 and ask about scheduling a free estimate in one of these neighboring communities.
Serving Pasadena, CA - Our Local Coverage Area
We’re based in the Pasadena 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 Pasadena
Yes, if your home is within a designated historic district like Bungalow Heaven or is an individually landmarked property, you’ll need sign-off from the Pasadena Historic Preservation Commission on replacement materials before work begins. The commission may reject standard architectural shingles as visually incompatible and require period-appropriate material – composite shake or tile that matches the original character. This review typically adds two to four weeks to the schedule. We handle the application and material documentation for you. Call (743) 200-8347 to discuss your home’s specific status and the likely timeline.
Older Pasadena homes hide problems under the existing roof – rotted sheathing, failed waterproofing, undersized rafters – that no one can see until tear-off. Contractors who bid on assumptions either eat the cost or hand you a change order. We write allowances into the contract before we start: framing repair, decking replacement, membrane upgrades – each item priced in writing, and no allowance is spent without your signed approval. If nothing is found, you don’t pay the allowance. That’s the only honest way to bid a roof on a 1920s bungalow. Call (743) 200-8347 for a written estimate with allowance language spelled out.
Homes in the Very High Fire Hazard Severity Zone – which includes much of the Pasadena foothill area – require a Class A fire-rated roof assembly per California Building Code Chapter 7A. That means the entire assembly, not just the top layer: decking, underlayment, and roof covering all tested together to resist flame spread. A standard unrated underlayment or a Class C shingle will not pass. We spec Class A assemblies as default for foothill homes and include the fire marshal’s inspection in the project schedule. Call (743) 200-8347 to confirm your home’s zone and what the assembly will cost.
Santa Ana and Diablo winds hitting Pasadena funnel through the mountain canyons directly above the foothill neighborhoods, generating uplift pressures that loosen fasteners on aged clay tile and improperly nailed shingles. A roof installed to coastal standards – fewer fasteners per tile, minimal edge detailing – will not hold through a strong wind season. We fasten to uplift requirements specific to foothill wind zones and inspect existing roofs for fastener fatigue before replacing anything. If you hear tiles rattling on a windy night, call (743) 200-8347 and we’ll inspect before the next event.
Because no neighboring city combines historic preservation sign-off with Very High Fire Hazard Severity Zone compliance at the same scale. In Bungalow Heaven, you may spend two to four weeks getting a composite tile approved by the Preservation Commission, then another round with the fire marshal’s office confirming the Class A assembly. South Pasadena and Altadena have historic homes, but they don’t have the same density of landmark districts plus strict WUI code enforcement. We build both approval timelines into the project schedule so you know the real finish date before we start. Call (743) 200-8347 for a written schedule and estimate.
Need a roof installation in Pasadena? Call (743) 200-8347 for a free estimate. We’ll send a written line-item quote with allowances stated up front, and the technician’s name and photo before they arrive at your door.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Pasadena since founding in 2000.