Owens Corning
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Owens Corning Roofing in Valley Glen, CA | Marquis Roof Repair
We provide our Roof Repair in Valley Glen, from targeted shingle repairs on postwar tract homes to full Duration architectural replacements on shallow-pitch decks. What sets our Owens Corning work apart here is simple: we know exactly how these shingle systems behave under Valley Glen’s specific conditions, the relentless inland heat, the dry Santa Ana winds, and the mid-century roof decks most homes still carry. Call (866) 705-2978 for a free estimate, and we’ll tell you honestly whether your Owens Corning roof needs a repair or has years of life left.
Why Valley Glen Residents Choose Us for Owens Corning Service
Ron Thibodeau studied building construction technology at Los Angeles Valley College, right here in Valley Glen, and spent more than two decades working roofs across the San Fernando Valley before founding Marquis Roof Repair. He learned early that shortcuts show up eventually, and that principle drives how we approach every Owens Corning service in Van Nuys and across the Valley.
We work on Owens Corning in Encino and across the flat Valley, from original mid-century asphalt shingle decks to newer Duration architectural installs. We’re not a single-brand shop pushing one product line. Marquis Roof Repair carries materials from seven major manufacturers, GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral, so our recommendation is driven by your roof, your climate, and your budget, never by what’s sitting in our warehouse. For Owens Corning work specifically, that means we recommend genuine Owens Corning hip-and-ridge, starter strip, and WeatherGuard underlayment when the system calls for it, and quality aftermarket flashing and boots where they outperform OEM. We investigate before we recommend, and that’s the only way we know how to operate.
We’re an independent contractor. We are not authorized, sponsored, or endorsed by Owens Corning. What we are is deeply familiar with their product lines, including how they fail under Valley Glen conditions, and that’s what matters when you need an honest diagnosis.
Styles & brands we work with
Common Owens Corning Roofing Problems We Solve in Valley Glen
- Thermal cracking and granule loss on Oakridge and older Supreme shingles. Valley Glen summers regularly push past 100°F, and west- and south-facing slopes take the worst of it. After enough years of that heat cycling, the asphalt in older Owens Corning shingle lines dries out, cracks, and sheds granules. You’ll see bare patches where the fiberglass mat starts to show through. That’s not cosmetic, it’s the shingle losing its UV protection, and it accelerates fast once it starts.
- Seal-strip failure and wind-lifted tabs after Santa Ana events. Dry Santa Ana winds can rip through the Valley at 40 to 60 mph. On shallow-pitch 1950s and 60s tract roofs with marginal fastening, the adhesive seal strips on Duration and Oakridge shingle fields can break loose, leaving tabs lifted and flapping. If you can see shingles curling or hear them tapping in the wind, water’s already finding its way underneath.
- Underlayment breakdown on low-slope mid-century decks. This is one we see constantly in Valley Glen. Heat bakes through Owens Corning shingles on low-slope roofs and slowly dries out the underlayment beneath. The paper tears and cracks before the shingles themselves fail, which means a roof can look fine from the street while the waterproofing layer underneath is compromised. By the time leaks show up on the ceiling, the damage is usually well underway.
- Flashing and vent-boot failures at tar-and-gravel transitions. Many Valley Glen tract homes still have original built-up tar-and-gravel sections that transition into pitched Owens Corning shingle fields. That junction is a classic failure point. Dissimilar materials expand and contract at different rates, ponding water sits at the flat-to-pitch seam, and the flashing eventually opens up. We rebuild those transitions properly and replace cracked vent boots before they leak into the attic.
- Granule loss on Owens Corning re-roofs installed over aging underlayment. When a previous contractor re-shingled without replacing the underlayment, the new Owens Corning field inherits whatever was underneath. In Valley Glen’s heat, that underlying material breaks down faster, and the shingle system fails from below. We always inspect what’s under the shingles, not just what’s on top.
Owens Corning Service in Valley Glen: What Local Conditions Mean for Your Equipment
Here’s something specific to Valley Glen that you won’t hear from roofers working the hillside neighborhoods to the south or the coastal-adjacent pockets west of the 405. Many homes in the 91404 ZIP and the surrounding postwar tracts still carry their original 1950s tar-and-gravel roofs, and after a hot Valley summer those surfaces develop a distinctive alligatoring pattern, deep cracks in the dried-out asphalt with failed reflective coating peeling away in sheets. We can spot it from the street before we even set up a ladder. This condition is practically unheard of on the pitched-shingle housing you’ll find in Sherman Oaks or Studio City, where the roofs are different, the elevation is slightly different, and the heat doesn’t sit on the deck the same way. In Valley Glen, that alligatored tar-and-gravel roof isn’t just an eyesore. It’s a waterproofing system at the end of its service life, and when it’s time to convert that shallow-pitch deck to an Owens Corning Duration architectural shingle system, the transition flashing and underlayment details make or break the job. We handle those conversions the right way, with the full Owens Corning sales & service expertise we’ve built over years of Valley work.
Owens Corning Models & Products We Service in Valley Glen
We service the full range of Owens Corning shingle lines you’re likely to have on a Valley Glen roof. That includes Oakridge asphalt shingles, the most common mid-tier line on older tract re-roofs, as well as Duration and Duration Designer architectural shingles, which we install frequently on full replacements. We also see Supreme and Classic three-tab shingles on homes that were re-roofed decades ago, plus Owens Corning TruDefinition Duration systems and WeatherGuard HP underlayment on newer jobs.
Our approach to parts is straightforward: when the existing system calls for it, we use genuine Owens Corning hip-and-ridge, starter strip, and underlayment. Where aftermarket flashing, pipe boots, and vent collars outperform OEM, we use those instead. We keep the common components stocked locally so Valley Glen service doesn’t stall waiting on a supply run. We repair isolated damage when the field still has life, and we recommend full replacement only when granule loss, seal failure, or underlayment age makes patching a short-term fix. A roof done right the first time is the only version worth doing.
See the difference
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Owens Corning roofing costs in Valley Glen vary by scope, but here’s what we typically see. A targeted shingle repair runs between $350 and $800 depending on the size of the damaged field and access. Flashing or vent-boot replacement at the flat-to-pitch transition typically falls between $250 and $650. Underlayment replacement beneath an Owens Corning shingle field runs $1,500 to $3,000 for a partial section on a typical Valley Glen tract home. A full Owens Corning Duration architectural replacement on a shallow-pitch deck usually lands between $12,000 and $22,000 depending on square footage, tear-off requirements, and the condition of the existing deck. Tar-and-gravel tear-off and conversion adds $4,000 to $8,000 to the job.
What drives the price here is the deck condition, the transition detailing, and whether the existing underlayment needs full replacement before new shingles go down. Your free estimate includes a full inspection and a written line-item quote, so you’ll know exactly what you’re paying for before any work starts. Call (866) 705-2978 for an exact number on your Valley Glen roof.
Serving Valley Glen, CA — Our Local Coverage Area
We’re based in the Valley Glen area and also handle Owens Corning in North Hills, so we know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – Owens Corning Roofing in Valley Glen
No, and we wouldn’t recommend it. Tar-and-gravel is a built-up roof system, not a shingle deck. It needs to be torn off down to the sheathing, the deck inspected and repaired where necessary, and then a proper underlayment and Owens Corning Duration system installed. Trying to shingle over it creates drainage problems, adds unnecessary weight, and hides deck damage you need to know about. We do this conversion regularly on Valley Glen tract homes. Call (866) 705-2978 if you want us to take a look.
Valley Glen’s inland heat is the main culprit. Summer temperatures over 100°F bake the asphalt in the shingles, and the adhesive that holds the granules breaks down faster than it would in cooler or coastal microclimates. West- and south-facing slopes lose granules first. If you’re seeing bare patches or granules collecting in the gutters after just a few years, it’s worth having us inspect whether the shingles are defective, improperly installed, or simply aging faster than expected in this climate.
They can, especially on the shallow-pitch roofs common in Valley Glen’s postwar tract housing. Santa Ana winds hit the Valley from the northeast, and on a low-slope roof they get under the shingle tabs and work against the seal strips. If the original install used too few fasteners, which we see often on older re-roofs, the tabs lift and the seal breaks. The result is wind-driven rain getting under the shingle field. After a strong Santa Ana event, it’s worth having us check your roof for lifted tabs before the next rain arrives. Call (866) 705-2978 to schedule an inspection.
The flat-to-pitch transition is the most failure-prone point on mixed-roof Valley Glen homes. We strip back both sides of the junction, inspect the underlying deck, install proper transition flashing that extends under the shingles and over the low-slope membrane, and tie everything together with compatible materials. The key is getting the flashing detail right, because that’s where leaks start when it’s done wrong. We rebuild these transitions regularly and they’re one of our strongest repair specialties.
That depends on three things: the amount of granule loss, the condition of the seal strips, and the age of the underlayment. If the shingle field still has granule coverage and the seals are intact, a targeted repair usually makes sense. If the shingles are bald, the tabs are lifting, or the underlayment has baked out under Valley Glen heat, you’re better off replacing before another 100°F summer accelerates the failure. We’ll tell you straight. Estimates are free, call (866) 705-2978.
Service Areas Near Valley Glen
We handle Owens Corning roofing work throughout the central and eastern San Fernando Valley. In addition to Valley Glen, our service area includes Valley Glen service area neighbors like North Hollywood, Sherman Oaks, Studio City, Burbank, and Glendale. If you’re just over the line in any of these communities, we’re already working nearby. For homes in the hillside neighborhoods west of Valley Glen, see our Owens Corning service in Sherman Oaks page. For central Los Angeles properties, we cover Owens Corning service in Koreatown as well.
Book Your Owens Corning Service in Valley Glen Today
If your Owens Corning roof is showing signs of Valley heat, wind damage, or granule loss, don’t wait for the next Santa Ana season to find out what’s really going on. Call (866) 705-2978 to schedule your free estimate, and we’ll give you a straight answer on what your Valley Glen roof needs. Built to the Marquis standard, from first inspection to final shingle.
Written by Ron Thibodeau, Owner at Marquis Roof Repair, serving Valley Glen and the San Fernando Valley since he first studied building construction at Los Angeles Valley College.