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 Ontario
Mercer Roofing handles roof repair, replacement, and inspections for homeowners across Ontario, CA. If you’re noticing granules in your gutters, water staining on ceilings, or tiles that shifted during the last Santa Ana wind event, we can get a crew to your Ontario neighborhood quickly. Call (743) 200-8347 and you’ll speak with a live person, not a voicemail tree, 24/7. We’ll schedule a free estimate and send you the name and photo of your technician before anyone knocks on your door.
Why Mercer Roofing Is Ontario’s Preferred Roofing Company
Ontario homeowners don’t just need a roofer. They need someone who understands what the inland valley climate does to a roof over ten or twenty years. Our crews work throughout Ontario regularly, from the historic Euclid Avenue corridor to the newer subdivisions east of the 15. We know which homes in the Model Colony need careful flashing work around original chimney stacks, and we know which 1970s ranch tracts off Vineyard Avenue have low-slope built-up roofs that pond after heavy winter rain.
Every Mercer technician arrives in a marked uniform wearing a photo ID badge. Before that, you get their name and photo sent to your phone. That’s the Threshold Verified standard, and it’s the same on every visit, no exceptions. Our Roofing Company team is background-checked and identity-verified before they ever set foot on an Ontario driveway.
Grant Whitlock leads our Ontario roofing work, and he insists on one thing above all: a written price before any job starts. No verbal estimates that drift. No surprise line items after tear-off. You’ll know the number before the first shingle comes off.
Roof Coating in Ontario
Roof Coating in Ontario is a practical option for low-slope commercial and residential roofs that are structurally sound but showing age. In Ontario’s sustained triple-digit summers, a reflective coating can cut surface temperatures dramatically and extend the life of an older membrane by years. We apply coatings most often on flat and low-slope roofs across Ontario’s warehouse district and on mid-century ranch homes where a full tear-off isn’t yet necessary.
When Coating Makes Sense vs. Replacement
A coating works when the underlying roof is still solid but the surface has begun to weather, crack, or lose its reflectivity. If there’s ponding water that doesn’t drain within 48 hours, or if the decking below is soft, coating won’t fix the problem and a re-roof is the honest answer. Our Ontario inspections include a decking check before we recommend either path.
Cost and Timeline for Ontario Homes
A typical residential roof coating in Ontario runs $3.50 to $6.00 per square foot, depending on the membrane condition and how many coats are needed. Most homes are done in one to two days. You’ll get a written quote before we begin, with the product name and coverage rate spelled out.
Free Roof Estimate in Ontario
A Free Roof Estimate in Ontario means exactly that at Mercer Roofing: we inspect your roof, document what we find with photos, and hand you a written line-item price. You pay nothing for this. It’s how every job should start, and it’s the only way we’ll start one. Call (743) 200-8347 and we’ll schedule a time that fits your week.
What the Estimate Includes
Your written estimate lists the exact materials we’ll use, the fastening pattern, the underlayment spec, and the labor. No allowances for “unforeseen conditions” that balloon later. If we suspect decking damage during the inspection, we flag it then, not after tear-off. That’s the difference between a compliant quote and a cheap one in Ontario.
Permit and Compliance Notes
Ontario building code requires wind-rated fastening on most re-roofs because of the wind loads funneling through the Cajon and San Gabriel passes. Your estimate will show the 6-nail high-wind pattern and enhanced starter strip if code calls for it on your roof. We pull permits on every job that requires one, and the permit close-out is part of the written scope.
Trusted Brands We Service in Ontario
We install and repair GAF, CertainTeed, and Owens Corning shingle systems most often in Ontario, and we stock local inventory for the products Ontario homeowners ask for by name. If you need Atlas or Tamko to match an existing roof, we can source it quickly through our Inland Empire supply chain. Every manufacturer-recognized install we do carries the brand’s material warranty, plus our written repair guarantee on top.
Common Roofing Problems We See in Ontario Homes
- Santa Ana wind lift on improperly fastened shingles. Gusts over 60 mph funnel through the mountain passes and peel standard 3-tab or 4-nail shingles right off the deck. We find this most often on homes re-roofed by low-bid crews that skipped the high-wind nailing pattern Ontario code requires.
- Ponding on low-slope ranch roofs. The 1950s-1970s ranch homes across Ontario often have roof pitches under 3:12. Water lingers, underlayment dry-rots, and leaks appear around penetrations years before the shingles look worn.
- Thermal cracking from triple-digit summers. Ontario consistently runs 10-15°F hotter than coastal LA. That sustained heat bleaches granules and cracks asphalt shingles well before their rated lifespan, which means replacement cycles here are shorter.
- Cracked concrete tile from thermal cycling. The 1980s-2000s subdivisions in Ontario are heavy with concrete tile roofs. The same heat that cracks asphalt also stresses tile, and a broken tile left unrepaired lets water into the underlayment below.
Pricing for Roofing in Ontario, CA
An asphalt shingle re-roof on a typical Ontario ranch home runs $8,500 to $14,000, or roughly $4.50 to $6.50 per square foot installed. Concrete tile re-roofs run higher, $14,000 to $22,000 depending on whether the existing tile can be reused. Roof coating on a low-slope roof runs $3.50 to $6.00 per square foot. Roof repairs range from $350 to $1,200 depending on the size of the damaged area and whether flashing or decking needs replacement. Every quote is written, itemized, and fixed before work starts. Call (743) 200-8347 for a free estimate.
We Also Serve Cities Near Ontario
Beyond Ontario, our crews cover Montclair, Claremont, Upland, and Rancho Cucamonga regularly. If you’re a few minutes outside Ontario, chances are we’re already working in your neighborhood. Our Roofing Company in Ontario service area extends across the western Inland Empire, so scheduling is simple and response is fast.
Serving Ontario, CA - Our Local Coverage Area
We’re based in the Ontario 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 in Ontario
Ontario re-roofs typically need a wind-rated fastening pattern: 6 nails per shingle in a high-wind nailing schedule, plus enhanced starter strips along the eaves. GAF Timberline, CertainTeed Landmark, and Owens Corning Duration shingles all carry ASTM wind ratings that satisfy Ontario’s code requirements when installed to the manufacturer’s high-wind spec. The rating on the shingle box is only half the story. The fastening pattern is what the inspector verifies. Call (743) 200-8347 and we’ll tell you what your roof actually requires.
Documented wind-rated roofing gives your Ontario insurer a concrete reason to view your roof as lower risk, and in many cases that lowers your premium or reduces the deductible on wind-related claims. We provide every customer with a compliance document that shows the fastening pattern, the shingle rating, and the permit close-out. Our crew re-roofed a 1950s low-slope ranch home off Euclid Avenue near the Model Colony corridor, where the original built-up roof had ponded for years and dry-rotted the decking around the penetrations. We tore off to the deck, replaced the rotted plywood, laid down ice and water shield in the valleys and along the drip edge, and installed GAF Timberline architectural shingles with a 6-nail high-wind pattern. The owner’s insurance adjuster signed off on the wind-rated documentation, and the premium dropped at renewal. That’s what documentation does.
If the decking is still solid and the ponding drains within 48 hours, a reflective coating is often the right call and runs $3.50 to $6.00 per square foot in Ontario. If the decking has dry-rotted around penetrations, or if water stands for days after a storm, a full tear-off is the honest fix. We’ll inspect the deck before we recommend either option, and the inspection is free. Call (743) 200-8347 to schedule it.
A compliant quote includes the 6-nail high-wind nailing schedule, enhanced starter strip, ice and water shield in valleys and around penetrations, permit fees, and written documentation of the wind rating after the job passes inspection. A cheaper bid often quotes 4-nail fastening, skips the ice and water shield, and doesn’t mention permits at all. The difference shows up after the next Santa Ana wind event, or during the next atmospheric river. You’ll see the line items side by side on the written estimates, and you can ask any contractor to match them. We’ll give you ours for free.
Most Ontario re-roofs are done in 2 to 5 days, depending on the roof size, the tear-off depth, and whether decking needs replacement. Yes, Ontario re-roofs typically require a permit, and we pull it as part of the written scope. The final inspection is scheduled by us, and the close-out document goes in your file. You won’t chase the city; we handle it. Call (743) 200-8347 for a timeline specific to your roof.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Ontario and the surrounding Inland Empire communities.