Owens Corning
Architectural shingles
Metal roofing
Tile roofingFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Owens Corning Roof Installation in San Diego: What to Know First
Owens Corning roof installation in San Diego typically runs $11,500 to $22,000 for a full replacement on a standard single-family home, depending on the shingle line you choose and the condition of your roof deck. We are an independent Owens Corning service provider, which means we install their shingle systems without being tied to a manufacturer’s sales program. Most full Owens Corning installations in San Diego take three to five working days from tear-off to final inspection.
If you own a home with existing Owens Corning shingles, or you’re considering them for a new installation, this page covers what actually happens on the job: which lines hold up in San Diego’s sun and marine layer, what we check before we install anything, and what you’ll pay. Call (619) 810-5520 and you’ll reach a live person, not a voicemail tree.
How Owens Corning Products Fail – and How We Fix Them
We see Owens Corning roofs across San Diego every week, and most problems come down to installation or age, not manufacturing defects. Here’s what we find most often:
- Duration Series granule loss on south-facing slopes. The Duration line, including Duration Flex and the heavier Duration Storm, uses SureNail fabric in the nailing zone, but San Diego’s UV load is brutal on the granule layer of any asphalt shingle. South-facing slopes in Clairemont Mesa, Mira Mesa, and East County lose granules fastest. We check granule adhesion before installation and recommend a shingle weight and color that won’t bake as fast on full-sun exposure. Granule loss means bare asphalt below, and bare asphalt means leaks within one to three seasons if left alone.
- Oakridge delamination at the lamination line. Older Oakridge shingles are common on San Diego homes from the early 2000s. Once the laminate seam starts separating, the shingle loses its wind rating and water can funnel through the gap. This is not repairable shingle by shingle, and that’s when we talk honestly about full replacement. Patching delaminated Oakridge with new shingles looks okay for about six months, then the surrounding shingles start going. We’ll tell you if patching is throwing good money at a roof that’s already done.
- Flashing failures at valley intersections on TruDefinition Duration. TruDefinition is a good shingle, but no shingle survives bad flashing. In San Diego’s May gray and June gloom cycle, valley flashing collects roof debris and moisture, and the thin aluminum many installers use corrodes and cracks. We replace with galvanized or copper valley flashing during any Owens Corning installation where the old flashing is under 26-gauge. That’s a spec most homeowners never hear about, and it’s the difference between a roof that leaks in year eight and one that doesn’t.
- Undersized decking under Supreme shingles. The Supreme line is a three-tab shingle that’s fine for budget installations, but we’ve torn off Supreme roofs in San Diego where the original installer laid them over plywood decking that was never rated for the fastening pattern the shingle needs. When the decking flexes, the shingle nails work loose. On every Owens Corning installation, we inspect the deck and flag any section under 3/8-inch that needs replacement before we lay the first row.
- Fascia and drip edge rot caused by improper starter strips. Owens Corning’s starter strip products, like Starter Strip Plus, are designed to seal the first course, but when they’re cut too short or omitted entirely, water wicks up under the shingle edges at the eaves. We replace damaged fascia board and install a proper drip edge on every Owens Corning roof we put on in San Diego. It’s a small detail that stops the black-stain rot you see on so many eaves around Pacific Beach and North Park.
Styles & brands we work with
Our Owens Corning Roof Installation Process
Every Owens Corning installation with Mercer Roofing Co San Diego follows the same steps, and you’ll know what’s happening before we arrive:
- 1
You call (619) 810-5520 and we schedule a visit. Before our technician shows up, you’ll get their name and photo sent to you. They’ll arrive in a marked uniform and present a photo ID badge at the door. That’s the Threshold Verified standard on every single job.
- 2
Roof inspection and written estimate. We walk the roof with you if you want, checking decking, flashing, vents, and the condition of any existing Owens Corning shingles. We write up a line-item price before any work starts, covering material, tear-off, decking replacement if needed, and cleanup. No surprises later.
- 3
Material selection. We’ll explain the differences between the Owens Corning lines relevant to San Diego, like Duration, Duration Storm, and Oakridge, and recommend a shingle weight and underlayment that fits your roof’s sun exposure and pitch. You pick the color and the line. We order the materials and schedule the tear-off.
- 4
Tear-off and deck inspection. We pull the old roof, then inspect the entire deck. Any rotted or undersized sections get replaced and added to the written price before the new roof goes on. We don’t cover anything up.
- 5
Installation. Underlayment, drip edge, valley flashing, starter strips, then shingles. Our crew works section by section and cleans up the ground at the end of each day.
- 6
Final walk-through and the 365-Day Done Right Promise. Grant Whitlock walks the finished job before we call it complete. If anything isn’t right within 365 days, we make it right. That’s in writing with every Owens Corning installation.
Every repair and every installation comes with a written guarantee. If a repair fails, the second visit is free.
See the difference
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AfterWhat Owens Corning Roof Installation Costs in San Diego
Here are real numbers for the Owens Corning jobs we price in San Diego, based on a standard 1,800 to 2,200 square foot single-story home:
- Supreme three-tab installation: $9,800 – $13,500
- Oakridge architectural shingle installation: $12,000 – $16,000
- Duration architectural shingle installation: $13,500 – $18,500
- Duration Storm (Class 4 impact-rated) installation: $16,000 – $22,000
- Decking replacement (per 4×8 sheet): $85 – $140
- Valley flashing replacement (galvanized, per valley): $350 – $650
What moves the price: roof pitch (steep roofs cost more in labor and safety setup), number of valleys and penetrations, whether the existing decking is sound, and whether your home has multiple stories. Tear-off of an old Owens Corning roof is usually included in the per-square price we quote, but we’ll always give you a written price before any work starts. Call (619) 810-5520 for an exact quote. Estimates are free.
Why San Diego Homeowners Call Mercer Roofing Co San Diego for Owens Corning Work
We’re not going to tell you our work is “top-notch” or that we “care about quality.” Here’s what we actually do instead. Every Owens Corning installation is covered by our 365-Day Done Right Promise: if it’s not right within a year, we make it right, and that promise is written down, not handshake talk. Every technician who comes to your home has been background-checked, identity-verified, and arrives in uniform with a photo ID badge. You’ll get their name and photo before they show up. If you call our office, a live person answers. Not a form, not a call-back, not a bot.
We work with Owens Corning, GAF, and CertainTeed, among others, because no single manufacturer makes the right shingle for every roof in San Diego. If your roof’s exposure, pitch, or the style of your home points toward a GAF Timberline or CertainTeed Landmark instead of an Owens Corning Duration, we’ll tell you that straight. Founded in 2000 and part of the Threshold Group family, Mercer Roofing Co San Diego is independently owned and operated, and every job is held to the Threshold Verified standard. One roof, one written price, one year of certainty. A roof shouldn’t be something you worry about – that’s what we’re here for.
FAQs
No, installing Owens Corning shingles through an independent contractor does not automatically void the material warranty. Manufacturer warranties on shingles cover material defects, not installation labor. What matters is that the shingles are installed to Owens Corning’s published installation specifications, including fastening pattern, underlayment compatibility, and ventilation requirements. We install to spec and document the job in writing. Some enhanced warranties, like Owens Corning’s System Protection or Preferred Protection extended warranties, do require manufacturer-certified contractors, and if that matters to you, we’ll be honest about what’s available through us versus what isn’t. Call (619) 810-5520 if you want to walk through your warranty options before you commit.
Most full Owens Corning installations take three to five working days from tear-off to final inspection for a standard single-story home. Two-story homes, steep pitches, or extensive decking replacement add a day or two. San Diego’s mild weather means we can schedule most of the year, though June gray marine layer days can slow adhesive curing on certain shingle lines. We’ll give you a firm timeline in the written estimate.
If your Owens Corning roof is under 12 years old and the problem is isolated, like one valley flashing leak or a small section of wind damage, repair usually makes sense. If the roof is 18 to 20-plus years old and you’re seeing multiple leaks, granule loss across large areas, or starting to see delamination at the shingle seams, replacement is the honest call. We’ll show you the condition during our inspection, and our written repair guarantee includes a free second visit if a repair fails. Call (619) 810-5520 for an assessment with a tech who won’t push a replacement if a repair is the better move.
Duration is a heavier, thicker architectural shingle with SureNail fabric in the nailing zone, which resists blow-off in high wind. Oakridge is lighter and less expensive, and its lamination line is a known delamination point as the shingle ages in San Diego’s sun. For homes in coastal areas with consistent marine layer and the occasional strong Santa Ana wind, Duration is the better long-term value in most cases. Duration Storm adds Class 4 impact resistance, which is worth considering if you live in an area with overhanging trees or if you want the stronger insurance premium story. We’ll show you samples of each during the estimate.
Owens Corning asphalt shingles are rated for roof slopes of 4:12 and steeper in most applications. For low-slope or flat roof sections, we use the correct material for that slope, whether that’s a modified bitumen system or a different underlayment and shingle approach, and we won’t install shingles where the manufacturer says they don’t belong. Most San Diego homes with Owens Corning roofs have pitches that qualify, but sections like porch overhangs or additions sometimes need different handling. We’ll tell you what your roof needs when we inspect it, and the written estimate covers every section of the roof. Call (619) 810-5520 to schedule your free estimate.
Written by Grant Whitlock, Owner, Mercer Roofing Co San Diego at Mercer Roofing Co San Diego, serving San Diego and nearby areas.