Metal roofing
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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Why Woodland Hills Homeowners Choose CertainTeed Roofing
We provide Woodland Hills Certainteed service including independent roofing repair and installation across Woodland Hills, from the flats south of Ventura Boulevard up into the foothill communities where the Santa Anas hit hardest. As an independent CertainTeed service provider, we work on Landmark architectural shingles, XT 25 three-tabs, Presidential Shake, and Flintlastic SA low-slope systems every week, and we know exactly how these materials fail in this specific climate. Our crews arrive with their name and photo sent ahead, badge at the door, and a written price before any work starts. Call (341) 217-2677 for a free estimate on any CertainTeed roof issue.
Why Trust Mercer Roofing Co Woodland Hills for Your CertainTeed Roofing?
CertainTeed builds a solid shingle. That part is rarely the question. The question is whether the person on your roof understands how that shingle behaves after ten summers of 110-degree heat and three Santa Ana seasons. Our Woodland Hills crew works on CertainTeed systems in this exact climate week after week, from mid-century post-and-beam homes in the flats to 1950s tract ranches and newer hillside builds, and we also offer Certainteed repair in Agoura Hills. We know where Landmark shingles lose granules first on a south-facing plane, and we know what a Flintlastic SA end-lap looks like when thermal cycling has started pulling it apart.
Grant Whitlock, our owner, grew up in Los Angeles and learned the trade through the construction technology program at Los Angeles Trade-Technical College before spending well over a decade putting roofs on homes across Woodland Hills, including jobs up in the Warner Center corridor where summer heat alone reveals every installation shortcut. He is the reason our techs are trained to check seal strips, drip edge, and flashing before recommending anything, and he will tell you plainly when a repair is enough. We keep OEM-compatible CertainTeed stock on the truck and use genuine CertainTeed shingles and accessories whenever a visible or warranty-sensitive match matters.
Styles & brands we work with
Common CertainTeed Roofing Problems We Fix in Woodland Hills
Here are the failures we actually see on CertainTeed systems in this Valley climate. These are not generic roof problems. They are tied to specific products and the way Woodland Hills weather works on them.
- Adhesive seal failure on CertainTeed XT 25 three-tab shingles. The XT 25 uses a heat-activated seal strip, and after enough years of Valley sun, that strip can harden and lose its grip. When a Santa Ana wind event follows, tabs lift clean off the shingle below. We recently repaired a 1970s Woodland Hills ranch where original XT 25 shingles had lost their seal strip and several tabs were lifting along the south-facing eaves. Our techs replaced the damaged shingles with matched three-tab stock, installed new drip edge on the rakes, and re-nailed the existing underlayment, ending the wind-driven rain leaks without a full tear-off.
- Granule loss on CertainTeed Landmark architectural shingles. Landmark is a good shingle, but south-facing planes in Woodland Hills absorb UV for ten months a year, and the ceramic granules that protect the asphalt eventually break away. You will see them collecting in gutters or staining the driveway after a rain. This is not a warranty claim on a ten-year-old roof; it is the material doing what the Valley does to it. We can patch isolated granule loss, but when it is widespread across multiple planes, replacement is the honest call.
- Leaks at improperly flashed pipe boots and valleys on older Landmark installations. The shingles are rarely the leak source on a 15-year-old Landmark roof. It is the flashing. Pipe boots corrode, valley metal thins out, and water finds its way under the shingle course. We replace flashing with quality aftermarket material that outlives the original, then re-seat the shingles around it.
- Flintlastic SA membrane end-lap de-bonding on low-slope sections. Woodland Hills has a lot of flat and low-slope roof sections, especially on mid-century ranches and contemporary builds. Flintlastic SA is a self-adhered modified bitumen membrane, and we see the end-laps pull apart where standing water sits and thermal cycling repeats. The fix is a clean, primed re-bond at the affected lap, but continued de-bonding across a large section often means re-coating the entire field.
- Wind-driven rain intrusion after Santa Ana events on older three-tab installations. Woodland Hills sits directly in the Santa Ana wind corridor. When seal strips fail and tabs lift, the roof does not just look bad. Rain gets driven horizontally under the shingles and into the decking. By the time you see a ceiling stain, the underlayment has been wicking moisture for weeks. We check the whole plane, not just the visible damage.
CertainTeed Parts & Our Repair-vs-Replace Approach
We use genuine CertainTeed shingles and accessories for visible or warranty-sensitive replacements whenever the homeowner prefers an OEM match. That means we can match Landmark colors and XT 25 three-tab stock so a repair does not stand out from the rest of the roof. For flashing, underlayment, and sealants, we rely on quality aftermarket material when the original CertainTeed part is outdated or the homeowner wants to control cost. The flashing is not the warranty-sensitive piece; the shingle is.
Our repair-versus-replace stance is straightforward. Isolated damage on a younger CertainTeed roof, torn shingles, one failed pipe boot, a small Flintlastic de-bond, that is a job for our Roof Repair services. Widespread granule loss, seal failure across a full plane, or repeated leaks in multiple valleys, that is systemic wear, and no repair will buy you more than a season or two. We will put the recommendation in writing and let the numbers speak. Call (341) 217-2677 if you want an honest read on which side of that line your roof falls.
Our CertainTeed Service Process – Step by Step
- 1
Diagnosis. A background-checked, uniformed technician arrives with a photo ID badge, and you already have their name and photo from us. They inspect the specific CertainTeed product, check seal strips on three-tabs, granule coverage on Landmark, lap adhesion on Flintlastic SA, and flashing condition at every penetration.
- 2
Repair or install. We work from a written price you approved before any nail is driven. For repairs, we match the existing CertainTeed shingle stock or confirm an acceptable aftermarket match. For installs, we spec the right CertainTeed line for your roof architecture and the Woodland Hills heat load.
- 3
Test. After the work, we water-test flashing and membrane repairs, check nail patterns, and confirm every tab and lap is seated. If it will fail in the next rain, we find it now, not after.
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Warranty. Every repair includes a written 365-day guarantee. If it fails within that year, we return and make it right at no cost, with a free second visit. You get that in writing on every job.
See the difference
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AfterCertainTeed Products We Service & Install in Woodland Hills
We provide Certainteed service in Simi Valley and install the full range of CertainTeed roofing products common in this area. That includes CertainTeed Landmark architectural shingles, CertainTeed XT 25 three-tab shingles, CertainTeed Presidential Shake luxury shingles, and CertainTeed Flintlastic SA self-adhered modified bitumen for low-slope and flat sections. We keep matched three-tab stock and common Landmark colors on the truck for same-visit repairs, and we can order Presidential Shake or specialty colors within days for larger jobs. Mid-century ranches, hillside clay tile transitions, and contemporary flat-roof builds, we see all of them in Woodland Hills.
We Also Service These Brands
CertainTeed is a major part of our Woodland Hills work, but we are not a single-brand shop. We also install and repair GAF and Owens Corning systems, along with other manufacturer-recognized shingle brands. If your roof has a mix of products or you are considering a brand change, we can give you a straight comparison without a sales pitch.
FAQs – CertainTeed Roofing Service in Woodland Hills
No. We are an independent CertainTeed service provider. We are not authorized, certified, or affiliated with CertainTeed Corporation. What we are is a Woodland Hills roofing company that works on CertainTeed products every week and knows their failure modes in this climate better than most manufacturer call centers do. We use genuine CertainTeed parts where it matters and stand behind our work with our own written 365-day guarantee.
Yes, for shingle replacements where a color or profile match matters and for warranty-sensitive visible areas. We use genuine CertainTeed Landmark, XT 25, Presidential Shake, and Flintlastic SA stock. For flashing, underlayment, and sealants, we use quality aftermarket material, because those components are not what CertainTeed’s warranty covers and the aftermarket options often outperform the original. Call (341) 217-2677 to talk through what is on your roof and what it needs.
Yes. Landmark shingles installed in Woodland Hills need to be nailed at the proper depth and pattern on day one, because the Valley’s prolonged summer heat makes the asphalt soften and the seal strip activate faster than in coastal climates. An improperly nailed Landmark shingle will not show it immediately. It will show it after three or four summers when thermal cycling has worked the shingle loose. We install to manufacturer spec every time, because a shingle that seals right on day one is a shingle that stays down in a Santa Ana.
Often yes. XT 25 three-tab stock in common colors is still available, and we keep matched three-tab stock on the truck for same-visit repairs. If your color has been discontinued or is heavily sun-faded, we will tell you straight: a close match that weathers in over a season, or a re-roof of the affected plane. We will not sell you a patch that looks like a patch. Call (341) 217-2677 with your color name if you know it, and we will check stock before we come out.
Granule loss on a Landmark roof in Woodland Hills usually means years of intense summer UV on south-facing planes have broken down the embedded ceramic granules and exposed the asphalt below. Some granule loss is normal on a ten-year-old Valley roof. Heavy loss across multiple planes, with visible bald spots or shingles that feel thin underfoot, means the roof is in systemic decline, and patching will not reverse it. We will inspect without charge and give you our honest read.
The right repair depends on where the Flintlastic SA is failing. End-lap de-bonding is the most common Woodland Hills failure, and it is fixed by priming and re-bonding the affected lap with a compatible adhesive. If standing water is sitting on the section and the membrane is wrinkled or split, a larger re-coat or replacement is usually the better fix. We will water-test after any repair so you are not waiting for the first rain to find out. Call (341) 217-2677 and we will come take a look.
Yes. We do full tear-offs of old CertainTeed systems and install new CertainTeed products, whether that is replacing XT 25 three-tabs with Landmark architectural shingles or re-specifying a Flintlastic SA low-slope section. We also handle partial replacements when the underlying decking remains sound. You get a written price before any work starts, and a written 365-day guarantee on the completed install.
Book Your CertainTeed Service in Woodland Hills, CA
A roof should be the last thing you worry about. Let’s make sure it is. Call (341) 217-2677 to schedule a free estimate on your CertainTeed roof, from a single lifted tab to a full re-roof. You will know who is coming, what it costs, and what we will do, before anyone climbs a ladder.
Written by Grant Whitlock, Owner at Mercer Roofing Co Woodland Hills, serving Woodland Hills since 2000.