Owens Corning
Architectural shingles
Metal roofing
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GAF
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Why Woodland Hills Homeowners Choose Owens Corning Roofing
Owens Corning in Woodland Hills repair, service, and installation is what Mercer Roofing Co Woodland Hills provides independently across Woodland Hills, CA. We work on Duration, Oakridge, and Supreme shingle systems, plus WeatherLock underlayment and VentSure ventilation. What sets our Owens Corning work apart is simple: we know the specific failure points these roofs develop in San Fernando Valley heat, and we put every price in writing before work begins. Call (341) 217-2677 for a free estimate.
We are not affiliated with or authorized by Owens Corning. We are an independent Owens Corning service provider, and that independence matters. It means we recommend what the roof actually needs, not what a manufacturer program tells us to sell. Grant Whitlock, owner of Mercer Roofing Co Woodland Hills, grew up in Los Angeles and learned the trade through the construction technology program at Los Angeles Trade-Technical College. He has been putting roofs on homes across Woodland Hills for well over a decade, including jobs up in the Warner Center corridor where the summer heat alone will tell you everything you need to know about whether a roof was installed properly. That experience shows up in how we diagnose Owens Corning systems, and it shows up in writing, before anyone picks up a nail gun.
Why Trust Mercer Roofing Co Woodland Hills for Your Owens Corning Roofing?
Our crews work on Owens Corning roofing systems across Woodland Hills every week, from Duration and Oakridge shingle replacements to WeatherLock underlayment and VentSure ventilation. That repetition builds familiarity you cannot get from a training video. We know how Duration TruDefinition shingles behave when the sealant strips let go along a valley. We know what Oakridge granule loss looks like on a south-facing slope after five Valley summers. We know where WeatherLock tears when decking shifts under tile transitions. This is not brand loyalty. It is field experience, earned one roof at a time.
Every technician who arrives at your door is background-checked, identity-verified, and badged under the Threshold Verified standard. We send you their name and photo before they arrive. They wear a clean, marked uniform and carry a photo ID they will show without being asked. That standard applies to every Owens Corning job we do, from a small valley repair to a full Duration re-roof. And when we finish, you get a written guarantee on every repair, including a free second visit if the repair fails. Grant puts that in writing every time. A roof should be the last thing you worry about. Let’s make sure it is.
Styles & brands we work with
Common Owens Corning Roofing Problems We Fix in Woodland Hills
Here are the Owens Corning-specific issues we see most often in Woodland Hills. These are real failure modes, not generic roofing complaints.
- Valley sealant failure on Duration Series shingles. Duration TruDefinition shingles use a sealant strip that bonds the tabs, but after repeated 110°F heat cycles, that sealant can cook and lose adhesion. When a Santa Ana wind pushes rain sideways into the valley, water gets under the loosened tabs and runs beneath the shingle. Homeowners often see no damage from the ground. By the time a stain shows on the ceiling, the WeatherLock underneath has been doing all the work. We fix this by pulling the affected shingles, checking the underlayment, replacing the valley metal, and re-nailing with the correct pattern.
- Premature granule loss on south-facing Oakridge slopes. Oakridge shingles carry a heavy granule layer, but Woodland Hills UV exposure is relentless. South-facing slopes in neighborhoods south of Ventura Boulevard bake all summer, and granules start shedding within seven to ten years. That is not a manufacturing defect, it is the local climate. Once the granule layer thins, the asphalt beneath oxidizes faster, and the shingle dries out, curls, and splits. We look for granule accumulation in gutters as an early warning, and we tell homeowners honestly whether they need spot replacement or a full slope replacement.
- WeatherLock underlayment tearing at tile roof transitions. WeatherLock Flex is a good underlayment, but on Woodland Hills hillside homes where clay tile meets a flat section or a wall, decking shifts over time. That movement can tear the underlayment at the transition, especially after a heat wave followed by the first winter rain. The tear lets water in at the most vulnerable point on the roof. Fixing it means removing tile, replacing the torn section, sealing the transition, and resetting the tile with proper fasteners.
- VentSure ridge vent blockage from wildfire ash and debris. VentSure ridge vents are designed to pull air continuously, but in Woodland Hills, wildfire ash and fine dust work their way into the vent openings. Over time, that debris blocks airflow, and the attic heats up, which cooks the shingles from underneath. We see reduced attic ventilation on homes even three or four years after a bad fire season. Clearing the vent and verifying airflow is a quick fix that extends shingle life.
- Sun-cracked tabs on Supreme Series shingles. Supreme is an entry-level Owens Corning line, and in Woodland Hills heat, the tabs harden and crack faster than premium lines. We recommend replacement when more than 25% of a slope shows sun-cracked tabs, because individual replacements look wrong and will not seal correctly with surrounding shingles. On homes with low-slope or flat sections, we also inspect the membrane coating, because heat accelerates coating breakdown there.
Owens Corning Parts & Our Repair-vs-Replace Approach
We prefer genuine Owens Corning components, Duration shingles, WeatherLock underlayment, and VentSure vents, when the repair scope warrants it. OEM parts guarantee color match and dimensional consistency, and they keep the roof’s warranty footprint as clean as possible. But there are times when OEM does not make sense. Flashing, pipe boots, and sealants are commodity items, and quality aftermarket versions perform just as well at a lower cost. We will tell you which parts justify OEM and which do not, and we will put that in the written estimate.
Our repair-versus-replace line is simple. We recommend replacement when widespread shingle delamination or sun-cracked tabs affect more than 25% of a slope. Below that, targeted repair usually makes more sense. We stock common Owens Corning-compatible flashing, sealants, and repair materials locally, which keeps turnaround short on most Woodland Hills jobs. If you are not sure whether your roof needs Roof Repair or replacement, call (341) 217-2677 and we will give you an honest read.
Our Owens Corning Service Process – Step by Step
- 1
Inspection and diagnosis. We walk the roof, check granule condition, test sealant adhesion, inspect valleys and transitions, and verify ventilation. For Owens Corning systems, we look specifically at Duration sealant strips, Oakridge granule retention on south-facing slopes, and WeatherLock condition at tile transitions.
- 2
Written estimate. Before any work starts, you get a written price that lists exactly what we will do, what parts we will use, and what the guarantee covers. No work begins without that document.
- 3
Repair or installation. If we are replacing shingles, we match the Owens Corning color and line as closely as the market allows. If we are installing WeatherLock or VentSure components, we follow manufacturer installation requirements. Every technician on the job is Threshold Verified, badged, and in a clean uniform.
- 4
Verification and testing. After the work, we check nail patterns, sealant adhesion, valley integrity, and ventilation airflow. On leak repairs, we water-test where practical and confirm the underlayment is dry.
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Written guarantee. Every repair includes a written guarantee, and if it fails within 365 days, we come back and make it right. That is the 365-Day Done Right Promise, in writing, on every job.
See the difference
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AfterOwens Corning Products We Service & Install in Woodland Hills
We service and install the Owens Corning product lines most common in Woodland Hills:
- Duration Series including Duration TruDefinition shingles, the line we see most often on newer Woodland Hills roofs.
- Oakridge Series common on mid-century ranch homes across the Valley, especially south-facing slopes that take the full summer sun.
- Supreme Series entry-level shingles, often on smaller homes and detached garages.
- WeatherLock Flex underlayment, used under both shingle and tile systems.
- VentSure ridge and intake ventilation components.
We also work on Owens Corning modified bitumen and cap sheet systems on the flat and low-slope sections common to Woodland Hills homes, and we offer Owens Corning service in Agoura Hills for similar foothill communities where rooflines mix pitch and flat sections.
We Also Service These Brands
While this page is about Owens Corning, Mercer Roofing Co Woodland Hills installs and repairs roofs across all major shingle brands. We work regularly with GAF and CertainTeed systems, as well as IKO, Atlas, Tamko, and Boral. If your roof uses a different brand but has an Owens Corning section, or if you are deciding between brands, we can give you a straight comparison based on what holds up in Woodland Hills conditions.
FAQs – Owens Corning Roofing Service in Woodland Hills
No. We are an independent Owens Corning service provider, not an authorized or certified contractor under Owens Corning’s manufacturer programs. That independence means we are not obligated to sell a particular product line, and we will not steer you toward a replacement when a repair is the right call. Our expertise comes from years of hands-on work with Owens Corning products in Woodland Hills conditions, not from a manufacturer agreement.
We use genuine Owens Corning components, Duration shingles, WeatherLock underlayment, and VentSure vents, when the repair scope calls for them. For flashing, boots, and sealants, we use quality aftermarket products where OEM is cost-prohibitive, and we tell you which is which in the written estimate. If color matching matters, OEM shingles are usually the only way to get a true match.
Owens Corning Duration shingles carry a limited lifetime warranty in most cases, but coverage depends on the date of installation, whether the system was registered, and whether the installation followed Owens Corning’s requirements. The prorated period and the wind coverage vary by year and product line. We can help you document roof condition and identify likely warranty eligibility during an inspection. Call (341) 217-2677 to schedule one.
Yes, in most cases. Owens Corning color availability changes over time, but Duration colors like Driftwood, Onyx Black, and Estate Gray are widely stocked and match well on newer roofs. On older roofs with years of sun fading, even the same color name may not match perfectly, and we will tell you that before we order anything. Call (341) 217-2677 if you need a color match assessment.
The most common failure is tearing at transition points where tile meets a flat section or a wall. Decking movement from heat expansion and the Santa Ana wind pressure on tile edges stretches the underlayment until it separates. That lets water in at the transition, which is also the hardest place to spot from the ground. We inspect these transitions on every Woodland Hills tile roof we service.
In Woodland Hills, granule loss within 10 years is usually heat-driven, not a product defect. South-facing slopes take continuous UV exposure through six months of dry, hot weather, and the asphalt binder that holds granules breaks down faster than on shaded slopes. Once granules shed, the shingle oxidizes faster and eventually curls or splits. We can replace the affected slope, and if the rest of the roof is sound, a partial replacement keeps the budget down. Call (341) 217-2677 for an honest assessment of whether you need a slope replacement or a full re-roof.
Yes. Flat and low-slope sections are common on Woodland Hills homes, and we also handle Owens Corning repair in Simi Valley where Owens Corning modified bitumen and cap sheet systems are what we see on many of them. Heat accelerates coating breakdown and seam separation on these systems. We patch, re-coat, and repair seams, and we will tell you when a full re-coat makes more sense than another patch. Estimates are free. Call (341) 217-2677.
In most cases, no. Repairs that follow manufacturer installation standards and use compatible materials will not void your warranty. The warranty typically covers manufacturing defects, not installation or repair work, and using aftermarket flashing or sealants does not invalidate shingle coverage. If you are concerned, we can review your specific warranty terms with you before work begins. Call (341) 217-2677.
Owens Corning repair work in Woodland Hills typically falls in these ranges: minor shingle or flashing repairs, $350 to $750; valley repair including new valley metal and shingle replacement, $600 to $1,200; underlayment section replacement at a tile transition, $800 to $1,800; full re-roof with Duration shingles, $12,000 to $28,000 depending on roof size, slope complexity, and decking condition. Every estimate is written, line-item, and fixed before work starts. Call (341) 217-2677 for an exact quote.
Small repairs like shingle replacement or flashing work are usually done in a day. Valley repairs and underlayment section replacements take one to two days. A full re-roof with Owens Corning Duration typically takes three to seven days depending on roof size, tear-off scope, and whether decking needs replacement. We will give you a clear timeline in the written estimate before any work begins. Call (341) 217-2677 to schedule.
Book Your Owens Corning Service in Woodland Hills, CA
If your Owens Corning roof needs work in Woodland Hills, call (341) 217-2677. We will send a Threshold Verified technician, in uniform, with a photo ID badge, and their name and photo will be sent to you before they arrive. Every estimate is written, every repair carries a 365-day guarantee, and a live person answers the phone 24/7. Call (341) 217-2677 today.
Written by Grant Whitlock, Owner at Mercer Roofing Co Woodland Hills, serving Woodland Hills since 2000.