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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Repair Across Ontario
Roof repair in Ontario means dealing with heat that bakes asphalt shingles past their breaking point and Santa Ana winds that tear at ridge caps and starter strips before anything else. We’ve worked those foothill-adjacent neighborhoods near the 210 long enough to know exactly what fails first, and we respond to Ontario calls from our Corona base with crews who understand Inland Empire roof conditions. Call (866) 942-4187 and we’ll put a straight answer together for you.
Ontario homeowners don’t need a sales pitch. They need someone who can open up a 1950s tract home in 91762, find the real problem, and tell them what it costs to fix. That’s the work we do every week.
Why Orange County Roofing Co Is Ontario’s Preferred Roof Repair Company
Kurt Hensley built this company around a simple idea: stock enough roofing brands that we never have to push one. We carry GAF for homeowners who need GAF repair in Ontario, plus CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. That matters in Ontario because a 1968 ranch in 91761 has different material needs than a newer tile-roof home in east Ontario, and we match the repair to the roof that’s actually sitting on your house.
Ontario customers call us because our inspection reports tell them exactly what their roof needs, nothing more. We don’t turn every granule-loss patch into a replacement pitch. After a wind event, our crews head to north Ontario and the 210 corridor first, because we know those downslope gusts hit hardest there. When we show up, we check ridge caps and starter strips before touching field shingles. That sequence isn’t a guess. It’s what thousands of Ontario roofs have taught us.
This page is where you’ll find local pricing, local failure patterns, and what actually happens when we open up an older Ontario roof. If you want to talk specifics about your home, call (866) 942-4187.
Styles & brands we work with
Flat Roof Repair in Ontario
Flat roof repair in Ontario usually means dealing with the low-slope or flat sections over back additions and enclosed patios on 1950s – 1980s tract homes. The 91761, 91762, and 91764 ZIPs are full of these. A typical flat roof patch in Ontario runs $450 – $950 for a small repair, while larger sections with cracked underlayment or failed seams can push $1,200 – $2,400 depending on square footage and decking condition. What looks like a simple tear often isn’t. Once we pull the top layer, we sometimes find soft sheathing that’s been soaking up heat and the occasional winter rain for decades.
Our Roof Repair team approaches flat sections differently than pitched roofs. Flat roofs hold water longer, they bake all summer, and the seams fail before the field material does. We inspect the whole low-slope area, not just the visible damage.
Underlayment and Seam Failures
On older Ontario flat roof sections, the underlayment breaks down long before the surface shows it. Heat cycles shrink and crack it, and the seams where the addition meets the original roofline are the first to open up. We replace the underlayment, seal the transitions, and make sure water has a path off the roof instead of pooling against the house.
Low-Slope Leaks Over Additions
Those back additions from the 1960s and 70s were often built with marginal slope. Water sits, finds a seam, and works its way in. Our crews see this constantly in 91764. The fix is re-sloping where possible, laying new membrane, and flashing the transition correctly so the next rain doesn’t find the same gap.
Shingle Roof Repair in Ontario
Shingle roof repair in Ontario is driven by two forces: summer heat that bakes granules off and Santa Ana winds that lift edges and ridge caps. A typical shingle replacement on an Ontario home runs $350 – $700 when we’re replacing a handful of damaged shingles, while a larger section repair with decking work can run $900 – $1,800. We don’t treat shingle repair as a patch job. We check the decking underneath, because on these older homes, what’s on top is usually not the whole story.
When we arrive at an Ontario home after a wind event, we look at the ridge caps and starter strips first. That’s where our Roof Repair crews find failures before the field shingles even move. Homeowners who only patch the field shingles get a repeat blow-off next Santa Ana season.
Ridge Cap and Starter Strip Replacement
Ridge caps take the full force of downslope gusts coming through the Cajon Pass corridor. They lift, crack, and leave the ridge exposed. Starter strips along the eaves fail the same way. Both are fast fixes when caught early, and both are cheap insurance against a much larger blow-off later. In Ontario’s wind-prone north neighborhoods, this is the repair we recommend most often.
Granule Loss and UV Damage
Ontario summers routinely push past 100°F, and asphalt shingles bake in that heat year after year. Granules loosen, the mat gets exposed, and the shingle starts cracking. By the time a homeowner sees bald spots in the gutter, the shingles are usually past saving. We replace the affected shingles and inspect surrounding sections to see if the UV damage is spreading.
Trusted Brands We Service in Ontario
We install products from seven major shingle manufacturers, which means we stock local parts for Ontario homes and we’re not married to any single brand. For Ontario’s heat and wind profile, we frequently recommend Atlas and Tamko for their heat-reflective and wind-rated options, and GAF for homeowners who want a specific warranty tier. The material decision is yours. We’ll show you the trade-offs and let you choose. That’s the whole point of carrying seven brands instead of one. We service what we sell, and we don’t push a material just because we have it in the yard.
Common Roof Repair Problems We See in Ontario Homes
- Lifted ridge caps and starter strips after Santa Ana winds. The gusts that funnel through the Cajon Pass hit north Ontario and foothill-adjacent streets hardest. Ridge caps fail first, and patching only field shingles means a repeat blow-off next event.
- Granule loss and UV cracking from 100°F+ summers. Ontario’s heat bakes asphalt shingles until the mat is exposed and the shingle cracks. What starts as a simple shingle repair often turns into a decking inspection once we see what the heat did underneath.
- Low-slope addition failures on 1950s – 1980s tract homes. The additions on homes in 91761, 91762, and 91764 were often built with minimal slope and original underlayment. Decades of hot, dry weather plus occasional winter rain leaves cracked seams and soft sheathing.
- Hidden decking damage beneath older roofs. When we open up an Ontario roof, we regularly find soft sheathing and undersized framing that was fine when it was built but hasn’t held up to six decades of heat. This is what moves a repair quote, and it’s why we inspect before we quote.
See the difference
Before
After
Before
After
Before
AfterPricing for Roof Repair in Ontario, CA
Here’s what Ontario homeowners can expect to pay for common repairs:
- Shingle replacement (small section): $350 – $700
- Flat roof patch: $450 – $950
- Ridge cap and starter strip replacement: $400 – $900
- Flashing repair around penetrations or chimneys: $350 – $800
- Decking replacement (per sheet): $120 – $180
- Larger section repair with decking and underlayment: $900 – $1,800
What moves the number is what we find when we open the roof. An older 1962 home in 91764 with soft sheathing and undersized framing will cost more than a newer east Ontario home with a clean deck. We write allowances into every repair contract so you know upfront what decking replacement and code-triggered work will cost if we find it. Call (866) 942-4187 for a free estimate with real numbers, not a ballpark.
We Also Serve Cities Near Ontario
Our crews serve Ontario plus the surrounding Inland Empire communities of Montclair, Upland, Chino, and San Antonio Heights. If you’re in one of those towns and your roof is showing heat or wind damage, call (866) 942-4187. We’ll send someone who knows what Inland Empire roofs do under 100°F sun and Santa Ana gusts, no matter which side of the 10 you’re on.
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 Roof Repair in Ontario
Ridge caps and starter strips sit at the roof’s edges and peak, where Santa Ana winds get the most leverage. In Ontario, downslope gusts off the Cajon Pass tear at these sections before field shingles move. Checking them first catches the failure at the source, and skipping them is why so many Ontario homeowners get a repeat blow-off on the next wind event. If your roof has been through a recent gust run, call (866) 942-4187 and we’ll check those spots first.
The decking. When we open up a 1950s – 1980s tract home in 91762, we often find soft sheathing, outdated wiring that needs to be moved or protected, and framing that’s undersized by today’s code. If the repair changes the existing structure, the building department requires code upgrades, and that moves the quote. We handle it by inspecting first, writing allowances into the contract, and getting written approval before we touch anything beyond the original scope. You’ll never get a surprise change order without a signed agreement first.
Faster than most homeowners realize. Sustained Inland Empire heat bakes asphalt shingles until granules release and the mat underneath gets exposed to UV. A 30-year architectural shingle on an Ontario roof often shows significant granule loss by year 15. That’s not a warranty issue, it’s heat and UV doing exactly what they do. The best protection is regular inspection and replacing damaged sections before the decking underneath starts to suffer.
A roofing square is 100 square feet. Most small repairs in Ontario cover less than one square, typically 2 – 4 shingles or a section under 50 square feet. It matters because repair pricing is calculated by the square, and decking replacement is priced per sheet. Understanding the square footage of your damaged area helps you read a quote honestly. We’ll give you the square count and the per-square line items on every estimate. Call (866) 942-4187 for a written breakdown.
Yes. Tile roofs on the newer east Ontario developments in 91761 and 91764 need different underlayment and flashing approaches than asphalt shingles. Tile doesn’t bake the same way, but the underlayment underneath still degrades from heat and the flashing points around vents and valleys still fail. We walk the tile carefully, replace broken pieces, and repair the underlayment and flashing without disturbing the surrounding tile field. If you have a tile roof and you’re seeing leaks, the problem is usually under the tile, not the tile itself.
Call Orange County Roofing Co for Ontario Roof Repair
If your roof took a hit from the last Santa Ana event or you’re seeing granule loss in the gutters, call (866) 942-4187. We’ll schedule a free estimate, inspect the damage, and give you a written quote with allowances and real numbers. Kurt Hensley and our Roof Repair team serve Ontario from Corona, and we know this city’s roofs better than most crews who just drive through. Call today and get an answer on what your roof actually needs.
Written by Kurt Hensley, Owner at Orange County Roofing Co, serving Ontario and the Inland Empire.