Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterCertainTeed Roofing in Ontario, CA | Mercer Roofing
Mercer Roofing provides independent CertainTeed roofing service across Ontario, CA, from shingle replacements on 1920s Euclid Avenue bungalows to low-slope membrane repairs on 1960s ranches. The one thing that makes our CertainTeed work here different is that we stock Landmark, Presidential, and NorthGate components locally, so we match exact profiles and colors instead of forcing a substitute. We’re not manufacturer-affiliated or authorized, but we know how these products actually behave in Ontario’s triple-digit heat and Santa Ana wind. Call (743) 200-8347 for a free estimate.
Why Ontario Residents Choose Us for CertainTeed Service
Most roofing companies in Ontario will install whatever shingle is on sale that week. We took a different path. Our crews work with CertainTeed products every week: CertainTeed sales & service work is a core part of what we do, not an afterthought. Grant Whitlock, our owner, grew up in the Sylmar neighborhood of Los Angeles and has been reading roofs across the basin for two decades. He learned the structural side at Los Angeles Trade-Technical College, and it shows in how we approach every job: we look at what the roof is doing before we touch it. As Grant puts it, “A roof that’s doing its job is one you never think about. Let’s keep it that way.”
Serving Ontario service area homes means we see the full range of housing stock: century-old Craftsman framing, mid-century ranch low-slopes, and 1980s – 2000s concrete tile subdivisions. We use genuine CertainTeed shingles, underlayments, and accessories whenever the profile and color are available, and only turn to equivalent aftermarket components when a match can’t be sourced, never a downgrade.
Common CertainTeed Roofing Problems We Solve in Ontario
- Landmark shingle thermal cracking. Ontario summers run 10 – 15°F hotter than coastal LA, with sustained triple-digit stretches that bake west- and south-facing slopes all afternoon. CertainTeed Landmark field shingles in these conditions can lose granules years early and develop cracking well before the warranty-rated lifespan. We see this constantly on 1980s – 2000s subdivisions where the original Landmark install has hit the 18 – 22 year mark and the heat has simply cooked the mat.
- Tile underlayment failure. Those 1990s Ontario homes with concrete tile roofs often look intact from the ground while leaking into the attic. The cause is almost always the CertainTeed underlayment underneath, which dries out and tears decades before the tile above shows wear. Replacing tile underlayment is one of the most common jobs we do in south Ontario subdivisions.
- NorthGate membrane ponding on low-slope ranches. Ontario’s 1950s – 1970s ranch tracts were often built with low-pitch roof geometry that drains poorly even on a dry day. When an atmospheric river rolls through, water ponds on CertainTeed NorthGate modified-bitumen membranes, and seams at flashing details blister and open after standing water sits for days. Flat roof patches here need to account for Ontario’s drainage reality, not just the tear.
- Santa Ana wind lift. Hot, dry gusts funnel through the mountain passes and hit Ontario hard. When shingles or tiles lift, it’s usually because the original install skipped CertainTeed’s high-wind nailing pattern. We correct fastening on every re-roof we touch, and we document it so the next inspection sees what was done.
- Model Colony bungalow decking failures. The historic Euclid Avenue corridor was roofed decades before modern CertainTeed products existed. Re-roofs there routinely require decking repairs and ventilation upgrades before any Landmark or Presidential shingle goes down. We plan for that from the first estimate.
CertainTeed Service in Ontario: What Local Conditions Mean for Your Equipment
Here’s something you won’t find on a generic Certainteed in Rancho Cucamonga service page. Ontario’s historic “Model Colony” bungalows along Euclid Avenue were built before modern synthetic underlayment, ridge ventilation, or architectural shingles existed. The original roofs went down over skip-sheathing and solid-sawn lumber spaced for wood shakes, not modern asphalt. When we re-roof one of these homes, the CertainTeed product is often the last thing we install. First comes decking repair, rotted rafter tail replacement, code-driven intake ventilation, and sometimes structural straightening. That’s a Euclid Avenue corridor problem you won’t find in the newer 1980s – 2000s tile subdivisions on the city’s south side, where the decking is plywood and the challenge is underlayment, not framing. On a 1920s Craftsman bungalow near Euclid, our crew tore off three layers of aged shingles, replaced rotted skip-sheathing, and added proper intake ventilation before installing CertainTeed Landmark shingles in a period-appropriate color. The homeowner had chased leaks for two seasons. The real culprits were failed underlayment and a valley that drained straight into a wall, both corrected with new CertainTeed underlayment and re-flashed valley metal.
CertainTeed Models & Products We Service in Ontario
We work across the CertainTeed residential product line: Landmark architectural shingles including Landmark Pro, Presidential Shake luxury shingles, NorthGate SBS-modified bitumen low-slope membrane, and Flintlastic self-adhered underlayment alongside RoofRunner synthetic underlayment. When you hire our Ontario Roofing Company for shingle replacement, we match the existing CertainTeed profile and color from local stock, so a patch repair on your Landmark roof doesn’t turn into a mismatched patch job. If a CertainTeed roof has isolated damage, we repair it. If granules are gone, the mat is cracked, or underlayment is failing across a slope, replacement is the honest call and we say so.
CertainTeed Service Pricing in Ontario
CertainTeed service pricing in Ontario depends on what we’re fixing and where. Here are the numbers we quote most often:
| Service Type | Typical Ontario Range |
|---|---|
| Shingle patch repair (Landmark / Presidential) | $350 – $700 |
| Flat roof patch (NorthGate membrane) | $450 – $900 |
| Tile underlayment replacement (per 10×10 section) | $800 – $1,500 |
| Full re-roof with Landmark shingles (1,500 sq ft) | $14,000 – $22,000 |
| Full re-roof with Presidential Shake | $25,000 – $40,000 |
What drives the cost: access, slope pitch, whether decking or underlayment needs replacement, and whether we’re matching existing CertainTeed profiles or starting fresh. Every estimate includes a written line-item price before any work starts, and every repair carries a written 365-day guarantee. Call (743) 200-8347 for an exact quote; estimates are free.
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 – CertainTeed Roofing in Ontario
Yes. Ontario’s inland valley position traps radiant heat, and west- and south-facing slopes in Ontario take hours of sustained triple-digit sun during summer months, which is consistently 10 – 15°F hotter than coastal LA. Granule loss and thermal cracking show up meaningfully earlier here. Call (743) 200-8347 to have us inspect your Landmark roof and tell you what’s actually left in it.
No, and this is a common mistake we correct with Ontario Roof Repair in mid-century ranch tracts. CertainTeed Landmark and Presidential shingles are rated for slopes of 2:12 or steeper. Low-pitch sections on 1950s – 1970s Ontario ranches need NorthGate SBS-modified bitumen membrane or another low-slope system instead. We’ll tell you which applies to your roof during the estimate.
CertainTeed’s warranty covers wind damage only when the shingles were installed to the manufacturer’s high-wind nailing pattern. We frequently find Ontario re-roofs where fastening was skipped or spaced wrong, and that’s exactly what the warranty exclusion points to. If shingles lift, we inspect the nailing pattern and quote a correction. Call (743) 200-8347 for a wind-damage assessment.
Usually the underlayment, not the tile. Ontario’s 1980s – 2000s subdivisions often used CertainTeed underlayment beneath concrete tile, and that underlayment dries out and tears years before the tile above shows any wear. When the underlayment fails, leaks appear with intact-looking tile on top. We inspect and replace the underlayment section by section, keeping the tile you already have.
We service residential CertainTeed systems across Ontario, and we do handle flat membrane repairs on smaller commercial structures near the airport corridor where access and scope are manageable. For distribution centers with footprints measured in hundreds of thousands of square feet, we’re happy to look and give you an honest referral if the job exceeds our residential crew capacity. Call (743) 200-8347 to discuss.
Service Areas Near Ontario
We serve Ontario and the surrounding Inland Empire communities, including Rancho Cucamonga, Pomona, Chino, Upland, and Montclair. For CertainTeed work elsewhere in the state, see CertainTeed service in Elk Grove and CertainTeed service in Santa Rosa.
Book Your CertainTeed Service in Ontario Today
Every Mercer Roofing technician arrives in a clean, marked uniform with a photo ID badge, and we send you their name and photo before they show up. Written price before work starts, written guarantee on every repair. Call (743) 200-8347 to schedule your free CertainTeed roofing estimate in Ontario.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Ontario since 2000.