Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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Before
AfterFast, Reliable Roof Installation Across South Pasadena
Roof installation in South Pasadena runs $9,800 to $24,000 for most homes, with historic-district re-roofs starting around $18,000 once period-appropriate materials and Commission review are factored in. We’re Mercer Roofing, and we’ve been re-roofing the Craftsman bungalows and Spanish Revival homes of this city long enough to know what’s under the shingles before we pull the first one. Opening up a roof here is different from opening up a roof in Alhambra or Temple City, and we plan for it. If you want a written price before any work starts, call (743) 200-8347 and we’ll come out, inspect, and put it all in writing.
Why Mercer Roofing Is South Pasadena’s Preferred Roof Installation Company
South Pasadena homeowners call us because we treat the front door the way they do. Before any technician arrives, you get their name and photo sent to you. They show up in a clean, marked uniform and present a photo ID badge at the door, every time. That’s the Threshold Verified standard we’re contractually held to as part of the Threshold Group family, founded in 2000. Our crews know South Pasadena’s streets, from the bungalow rows near Mission Street to the hillside homes off Via Del Rey, and they know what the Historic Preservation Commission expects before a tear-off starts.
We don’t ask you to trust us on faith. Every job gets a written price before work begins, and every repair carries a written guarantee. If a repair fails within a year, we’re back free of charge, covered by our 365-Day Done Right Promise. Homeowners here tell us the same thing: they want to know exactly who’s coming and exactly what it costs. We put both in writing, every time.
Roof Ventilation in South Pasadena
Roof ventilation in South Pasadena matters more than in the sunnier, less-shaded neighboring cities because the city’s dense Tree City USA canopy keeps north- and east-facing roof planes cool and damp for long stretches, and a poorly ventilated attic on those slopes turns trapped moisture into warped decking and premature shingle failure. We install balanced intake and exhaust systems, ridge vents, soffit vents, and powered attic fans sized to the actual square footage and pitch of your roof. Most South Pasadena homes built between 1895 and 1945 were framed with minimal eave venting, so upgrading ventilation during a re-roof is often the difference between a roof that lasts twenty-plus years and one that fails early from condensation. A full ventilation upgrade as part of a roof installation in South Pasadena typically runs $800 to $2,400 depending on attic size and access.
Attic Intake and Exhaust Balance
The goal is simple: air enters low at the eaves and exits high at the ridge. On South Pasadena’s older wood-frame homes, we often find original eave vents blocked by decades of paint or never cut wide enough in the first place. We open the intake points properly, install baffles to keep insulation from choking airflow, and match the exhaust area to the intake area. A balanced system keeps the attic dry and the shingle warranty valid, because most manufacturers void coverage on roofs with documented ventilation defects.
Signs You Need Ventilation Work During Re-Roofing
You might notice the shingles on one slope curling while the other side looks fine, or a persistent musty smell in the upstairs rooms after rain. Those are the signals we look for when we inspect South Pasadena attics: granule loss on the shaded side, damp spots on the underside of the decking, or rust on the nails protruding through the roof. We document what we find, show you photos of the affected areas, and include the ventilation correction in your written proposal before the first nail is driven.
Roof Flashing Installation in South Pasadena
Roof flashing installation in South Pasadena is where a lot of roofs quietly fail, because the original sheet-metal flashing on 1920s and 1930s homes here is often paper-thin galvanized steel that has corroded at the seams, especially where low-slope porch roofs meet the main gable. Flashing is the folded metal that directs water away from the joints where shingles meet a chimney, a dormer wall, a skylight, a valley, or a vent pipe. We replace and fabricate flashing from 26-gauge galvanized or painted aluminum matched to your roofline, and we re-flash every penetration when we install a new roof. Flashing installation as part of a roof installation in South Pasadena runs $600 to $2,200 depending on how many penetrations and valleys your roof has.
Valley and Chimney Flashing
On South Pasadena’s Craftsman homes, the open valleys between the main roof and the porch or dormer roof are prime leak points. We cut and fold new valley metal, often in a W-profile that channels water cleanly down and away from the seam. Chimney flashing gets particular attention here, because many original brick chimneys have settled slightly, opening hairline gaps at the counterflashing. We cut a reglet into the mortar joint and set the counterflashing into it, then seal the top edge, so rain and wind-driven water can’t get behind it.
Pipe Boots and Penetration Flashing
Plumbing vent pipes, bath fan outlets, and range hood vents all punch through the roof, and each one needs a properly sized boot with a flexible collar that seals around the pipe. In South Pasadena, we see original lead pipe boots that have cracked from decades of thermal cycling, and rubber boots that have gone stiff and split. We replace every boot we touch with a new one, and we set them in roofing cement under the shingle course so the seal is compression-tight. This is the kind of detail that doesn’t show up in a drive-by quote, but it’s the difference between a roof that leaks and one that doesn’t.
Trusted Brands We Service in South Pasadena
We install and repair roofs using manufacturer-recognized shingle brands including GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. Our Roof Installation team stocks the lines South Pasadena homeowners request most often, and for historic-district jobs we source approved composite profiles that replicate the look of wood shake and clay tile without the weight or fire-clearance issues. When a South Pasadena customer needs a material match on an older roof, we know which local suppliers carry the profiles the Historic Preservation Commission will accept, and we can usually get them on site within the same week.
Common Roof Installation Problems We See in South Pasadena Homes
- Historic-district review surprises. We’ve seen contractors start a tear-off on a contributing structure only to get flagged by the Historic Preservation Commission for lacking a Certificate of Appropriateness. The job stops, the old roof is half-off, and the homeowner is stuck waiting while period-appropriate materials are re-ordered. We check designations before anything is scheduled.
- Moss and algae on canopy-shaded slopes. The dense tree cover that makes South Pasadena beautiful also keeps north- and east-facing roof planes shaded and damp, so moss, algae, and lichen colonize much faster than in Alhambra or Temple City. That organic growth lifts shingle tabs and breaks the sealant strips, setting up early failure on roofs that looked fine from the curb.
- Layered tear-off around ornamental rafter tails. Many homes here carry two or three layers of roofing history on the original wood decking. Stripping those layers carelessly cracks or splits the exposed rafter tails and decorative eave details that make these houses contributing structures, and that damage is expensive to reverse once it’s done.
- Debris loading from continuous leaf fall. South Pasadena’s canopy means gutters and valleys collect leaves almost year-round. We regularly find valley metal crimped and sagging under the weight, and granule surfaces on composition shingles worn down where wet leaves sat against them season after season.
Pricing for Roof Installation in South Pasadena, CA
A standard architectural shingle re-roof on a South Pasadena bungalow or mid-century home typically runs $9,800 to $16,500, depending on square footage, number of roof planes, and how many layers need to come off. Homes inside the city’s historic districts start higher, usually $18,000 to $24,000, because period-appropriate clay tile or approved shake composites are more expensive and the tear-off has to move more carefully around ornamental details. Flat or low-slope porch roofs add $1,500 to $3,500 when done as part of the same project. New decking, where rot has taken hold, is priced per sheet at $75 to $120 installed. We write every quote in line-item detail, so you see exactly what you’re paying for. Call (743) 200-8347 and we’ll schedule a free inspection and written estimate.
We Also Serve Cities Near South Pasadena
Our crews work throughout the west San Gabriel Valley. If you’re in South Pasadena, we’re already nearby, and we also serve Alhambra, San Marino, Pasadena, and San Gabriel. If you’re deciding between cities or comparing roofers across the area, you’ll find the same written-price guarantee and the same Threshold Verified technicians on every job.
Serving South Pasadena, CA - Our Local Coverage Area
We’re based in the South 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 South Pasadena
Yes, if your home is a designated landmark or a contributing structure within one of South Pasadena’s city-designated historic districts, you’ll need a Certificate of Appropriateness from the Historic Preservation Commission before a re-roofing permit is issued, and the approved materials must be period-appropriate. We check the designation status on every South Pasadena job before we schedule anything, because finding out mid-tear-off means a stop-work order and a costly re-order. Call (743) 200-8347 and we’ll check your property while you watch.
South Pasadena’s dense tree canopy keeps north- and east-facing roof slopes shaded and damp for much of the year, which accelerates moss, algae, and lichen growth and keeps organic debris pressed against the shingle surface far longer than on exposed roofs in neighboring cities. The moss lifts shingle tabs and breaks the sealant strips meant to hold them down during Santa Ana wind events, and the constant leaf loading clogs gutters and valleys. We recommend an annual gutter clearing and a moss treatment on shaded slopes every few years to slow the wear.
A square is 100 square feet of roof area, and it’s the standard unit roofers use to price materials and labor. Every quote you get in South Pasadena should tell you how many squares the contractor is counting, because some companies inflate the square count to pad the price without changing the actual work. We measure the roof planes in person, mark the dimensions on the quote, and show the square count and the per-square price as separate line items. If you’re comparing quotes, ask every bidder for the same square count and the same material spec, and call (743) 200-8347 if you want us to walk you through what you’re reading.
We handle surprises the way we handle everything else: in writing, before we touch them. On older South Pasadena homes, a torn-off roof often reveals rotted decking, damaged rafter tails, or flashings that have been leaking into the framing for years, and we don’t expect you to take our word for it. We stop, show you what we found with photos and measurements, and put the additional work and price in writing for your approval before we proceed. No work starts on a change without your sign-off, and the final invoice matches the approved change order. That’s fixed pricing, and it’s part of every Mercer job.
Yes, in many cases, modern architectural shingles can meet both the wind resistance required for Santa Ana season and the visual expectations of the Historic Preservation Commission, but not all of them. We work with the brands the Commission regularly approves for non-landmark homes, including GAF, Atlas, and Tamko, and we can provide the specification sheets and wind ratings the city asks for. For landmark-designated homes, the requirement is usually stricter, meaning clay tile, wood shake, or an approved composite that replicates the historic profile. We’ll tell you plainly which category your home falls into before you spend a dollar, and we’ll put the material recommendation in the written quote.
Written by Grant Whitlock, Owner at Mercer Roofing, serving South Pasadena and the San Gabriel Valley.
Ready for a written estimate on your South Pasadena roof? Call (743) 200-8347 any time. A live person answers, and we’ll schedule the free inspection.