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 San Gabriel
Roofing work in San Gabriel usually falls into two buckets: the historic clay-tile homes on the Mission District blocks, and the low-pitch ranch tracts east of Del Mar. We scope both differently, because the buildings fail differently. If you’re dealing with cracked tile, a Santa Ana wind casualty, or a roof that’s simply reached the end of its service life, call our San Gabriel Roof Repair team at (743) 200-8347 and we’ll put a written price in front of you before any work begins.
Mercer Roofing is a Roofing Company that sends background-checked, photo-badged technicians to every job in San Gabriel. You’ll know who’s coming to your door before they arrive, because we send their name and photo ahead of the visit.
Why Mercer Roofing Is San Gabriel’s Preferred Roofing Company
The homes around San Gabriel are not interchangeable with the housing stock in Alhambra or Rosemead. The Mission District neighborhoods hold some of the densest concentrations of Spanish Colonial Revival construction in the eastern San Gabriel Valley, and those 1920s – 1940s clay tile roofs sit over wood sheathing that has endured eight or nine decades of inland heat. Our crews know what they’re going to find when they pull a section of tile on Junipero Serra Drive, and we write the scope to match what’s actually under the surface, not what a satellite photo suggests.
Customers in San Gabriel choose Mercer because the guesswork is removed at every step. A written price before work starts, a written guarantee on every repair, and a 365-Day Done Right Promise backed in writing. No exceptions, no conditional language. Grant Whitlock leads the team with a simple rule: if it’s not done right within a year, we make it right. That’s the promise, and it applies to every repair and installation we complete in San Gabriel.
Commercial Roofing in San Gabriel
Commercial Roofing in San Gabriel typically runs $9,500 – $28,000 depending on the building’s square footage, roof access, and whether the existing surface is TPO, modified bitumen, or an older tar-and-gravel system. Many of the commercial structures along Valley Boulevard and Las Tunas Drive were built in the 1960s and 1970s, and their low-slope roofs have absorbed four decades of summer heat that breaks down membrane seams faster than manufacturers’ published lifespans suggest.
Low-Slope Systems That Hold Up to Inland Heat
For commercial buildings in San Gabriel, we install and repair TPO, PVC, and EPDM systems. The inland valley heat is the primary wear factor. A roof that would last 20 years in a coastal climate often shows significant seam fatigue by year 15 here. We spec reflective membranes that reduce surface temperature, which lowers cooling load on the building and slows the thermal expansion cycle that causes seams to fail.
Scoping Commercial Work Without Guessing
Before we quote, our crew walks the roof, checks drainage points, and documents every penetration. If there’s ponding water after a rain, that area gets a closer look before numbers are written. A written line-item price follows, and no work starts until you’ve approved it.
Metal Roof Installation in San Gabriel
Metal Roof Installation in San Gabriel runs $17,500 – $42,000 for a typical single-family residence, with the final figure driven by roof complexity, existing decking condition, and whether we’re tearing off an old clay tile system first. Metal is a strong choice for the ranch tract homes on the east side of the city and for outbuilding-heavy lots where long-term durability and low maintenance matter more than matching a historic tile profile.
Metal Over Tile? We Walk It Before We Quote It
Some San Gabriel homeowners ask about metal over their existing clay tile. It’s doable in the right conditions, but not on Mission District homes where the substrate beneath the tile has already failed. You cannot install metal over warped skip sheathing and expect it to last. We inspect the decking before recommending any metal system, and if the substrate needs replacement first, that goes into the written price as a line item, not a surprise later.
Standing Seam and Stone-Coated Steel
For San Gabriel’s mix of historic and mid-century homes, we install standing seam panels in galvalume and painted finishes, plus stone-coated steel profiles that mimic the look of clay tile without the weight. The Santa Ana winds that funnel through the mountain passes put real stress on ridge lines and panel edges, so every metal installation includes wind-rated fastening and proper closure strips at the eaves.
Trusted Brands We Service in San Gabriel
We install and repair GAF, Owens Corning, and CertainTeed shingle systems, plus Boral clay tile for the historic Mission District homes that need period-correct replacements. Because so many San Gabriel houses were built with tile specific to their era, we keep a working inventory of matching tile profiles and ridge caps in the Los Angeles warehouse, which shortens the wait when a repair requires exact color and profile matching. For full reroofs, we’ll order direct from the manufacturer to ensure batch consistency across the entire roof surface.
Common Roofing Company Problems We See in San Gabriel Homes
- Failed skip sheathing under 1920s – 1940s clay tile. The tile looks intact from the street, but the wood substrate beneath has dried, warped, and split after 80 years of inland heat. A tile that won’t set correctly is almost always a substrate problem, not a tile problem.
- Wind-driven rain backup on low-pitch ranch roofs. East-side tract homes built in the 1950s – 1970s have shallow pitches that need ice and water shield at valleys and penetrations. When Santa Ana winds drive rain sideways, water backs up under the tile and finds the decking.
- Cracked mortar caps on Mission-era ridge lines. Summer temperatures of 95 – 105°F expand and contract clay tile more aggressively than coastal LA experiences. Mortar caps crack, ridge tiles loosen, and the next wind event lifts them.
- Detached structures ignored during re-roofs. Many San Gabriel lots have detached garages, workshops, or ADUs behind the main house. The main roof gets replaced while the detached structure’s roof continues aging. We scope all structures on the lot before writing a quote, so the price reflects the full job.
Pricing for Roofing Company in San Gabriel, CA
A focused roof repair in San Gabriel runs $550 – $2,900, with cracked clay tile replacement on Mission District homes typically falling in the $1,200 – $4,200 range once substrate repair is factored in. A full roof replacement runs $14,000 – $48,000, depending on the condition of the decking, the material you choose, and how many structures are on the lot. The single biggest price driver in San Gabriel is what’s under the tile. If the skip sheathing has failed, the repair cost reflects decking replacement before tile re-setting. Every estimate is free, written, and line-itemed. Call (743) 200-8347 and we’ll walk the roof, document what we find, and put the real numbers in your hand before you decide anything.
We Also Serve Cities Near San Gabriel
Mercer Roofing serves Roofing Company in San Gabriel and the surrounding communities, including San Marino, Temple City, Alhambra, and Rosemead. If you’re in a neighboring city and dealing with the same inland heat and Santa Ana wind issues, call (743) 200-8347 and we’ll schedule a walk-through the same way we do for our San Gabriel customers.
Serving San Gabriel, CA - Our Local Coverage Area
We’re based in the San Gabriel 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 San Gabriel
Repairs that involve replacing a limited number of tiles or shingles typically do not require a permit in San Gabriel, but any job that includes decking replacement, structural repair, or a full reroof does. We pull permits on every job that requires one, and the permit cost appears as a line item in your written estimate, not as an afterthought. Call (743) 200-8347 for a quote that spells out exactly what your job needs.
Sometimes yes, and sometimes the broken tiles are the symptom, not the problem. On the Mission District blocks around Mission Drive and Junipero Serra Drive, roofers routinely find 1930s – 1940s clay tile laid over skip sheathing that has warped and split after 80-plus years of inland heat. This substrate failure is largely invisible from the street and is the single biggest reason scoping here can’t be done from a satellite photo or a quick walk-by. If the sheathing has lost its holding power, we’ll show you photos from the roof and put the decking replacement in the written scope before re-setting the tile. Call (743) 200-8347 for a free walk-through and an honest assessment.
We scope every structure on the lot before writing a single number. That means walking the main house, the detached garage, any workshop, and any ADU, then documenting the condition of each roof separately. The quote lists each structure and its corresponding work scope, so you’re not signing for a main-house reroof while a failing detached garage roof gets ignored for another decade. This approach matters on San Gabriel lots where outbuildings often outnumber the main structure’s roof area. Call (743) 200-8347 and we’ll walk the whole property before you get a written price.
We install GAF, Owens Corning, and CertainTeed shingle systems, plus Boral clay tile for the historic Spanish Colonial Revival homes that need period-correct profiles. If you’re matching an existing tile on a Mission District home, we’ll work with the manufacturer to source the exact color and profile, or the closest current production equivalent if the original line has been discontinued. For full roof replacements, we order directly from the manufacturer to keep batch consistency across the entire surface. Call (743) 200-8347 and we’ll bring tile samples to your house so you can see the match in person before committing.
Yes, and it affects clay tile and shingle roofs differently. San Gabriel’s regular 95 – 105°F summer temperatures create thermal expansion cycles that crack mortar caps and loosen clay tile faster than manufacturers’ published lifespans would suggest. Asphalt shingles on the east-side ranch tracts age faster too, because the inland heat accelerates granule loss and seals the shingles’ adhesive strips prematurely in the first year. We factor this into every scope we write for San Gabriel homes, and our 365-Day Done Right Promise covers any workmanship issue that shows up within the first year. Call (743) 200-8347 for a free estimate that accounts for how your specific roof performs in this specific climate.
Call Mercer Roofing for Your San Gabriel Roofing Company Needs
When you call (743) 200-8347, a live person answers. Not a voicemail, not a call-back form. You’ll tell us what’s going on with your roof, and we’ll schedule a walk-through at your San Gabriel home. Before the technician arrives, you’ll get their name and photo, and when they knock, they’ll be badged, uniformed, and ready to walk the roof thoroughly. Every job gets a written price before any work starts, and every repair carries a written guarantee. If a repair fails within 365 days, we return and make it right, no charge. That’s the Mercer standard, and that’s what you get on every roof in San Gabriel.
Written by Grant Whitlock, Owner at Mercer Roofing, serving San Gabriel since 2000.