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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
CertainTeed Roof Installation in Los Angeles: What to Know First
CertainTeed roof installation in Los Angeles typically costs between $8,500 and $18,000 for a standard single-family home, depending on the shingle line, roof pitch, and decking condition. We’re an independent CertainTeed service provider, which means we install their products but aren’t owned by or authorized through the manufacturer itself. Most full installations take 2 to 5 working days once materials land and the old roof comes off. If you’re weighing CertainTeed against GAF or Owens Corning, or you already know you want CertainTeed and need a straight answer on cost, this page is for you. Call (213) 521-8272 for a written estimate before any work starts.
How CertainTeed Products Fail – and How We Fix Them
CertainTeed makes good shingles, but every line has its weak points. Here’s what we actually see on Los Angeles roofs, the failure modes that lead to a full roof installation, and how we handle each one.
- Landmark shingle granule loss on steep pitches. Landmark is CertainTeed’s most common architectural line in LA, and on hillside homes with pitches above 7/12 we regularly see premature granule loss along the lower edges. The sun bakes the asphalt on south-facing slopes, the granules lose grip, and within 12 to 15 years you’ve got bald patches. We address this during roof installation by checking the shingle’s manufacturing date before we buy, using stainless steel fasteners rated for coastal air, and recommending the heavier Landmark Pro line for south-facing sections where budget allows.
- Presidential Shake cupping and curling in the Valley. In Sherman Oaks, Encino, and Tarzana, we see Presidential Shake cupping within a decade. The problem isn’t the shingle itself but what’s under it. That thick luxury shingle traps heat, and if the attic ventilation is undersized, the underside of the shingle cooks while the top expands at a different rate. We won’t install Presidential Shake over existing decking without checking intake and exhaust ventilation first. If the airflow is wrong, the new roof will fail the same way the old one did.
- Northgate underlayment seal failure on low-slope sections. Northgate is CertainTeed’s SBS-modified shingle for slopes as low as 2:12, and on LA homes with low-slope rear additions we’ve seen the self-seal strip let go after heavy Santa Ana wind cycles. Shingles lift, dust and debris get under them, and the seal never re-forms. Our fix on a roof installation is to hand-seal the first course and any rakes where wind uplift is a known issue, then check every seal line with a temperature gun before we call the job done.
- XT 25 three-tab brittleness after 15+ years. XT 25 is a discontinued three-tab line, but plenty of LA homes still carry it. By year 15 or so, the fiberglass mat gets brittle and the shingle snaps when you lift it. Here’s the thing: if the decking is sound and the leaks are minor, a selective repair can buy you two or three more years. But if you’re at 18 years on an XT 25 roof, a roof installation is cheaper than chasing leaks one at a time. We’ll tell you which situation you’re in, flat-out.
- CertainTeed Ridge Vent spacing errors from prior installs. This one isn’t a product failure, it’s an installation failure we inherit. CertainTeed’s ridge vent system requires a specific gap width in the ridge sheathing, and we routinely find previous contractors cut it too wide or too narrow, which either starves the attic or pulls rain in sideways. On every CertainTeed roof installation we inspect the existing ridge opening and correct it to the spec printed in the CertainTeed installation guide before the new vent goes on.
Styles & brands we work with
Our CertainTeed Roof Installation Process
Here’s how a CertainTeed roof installation runs with us, step by step, so you know what to expect before anyone shows up at your door.
- 1
Call and written estimate. Call (213) 521-8272. We schedule a visit, answer your questions, and put a written estimate in your hand before you commit to anything. No estimate means no work, ever.
- 2
Roof inspection and decking check. We strip back test sections to check the plywood or OSB decking for rot, especially around valleys and penetrations. Los Angeles morning fog and occasional winter storms rot south-facing overhangs faster than people expect.
- 3
Parts and material decisions. We order CertainTeed shingles in the specific line and color we agreed on, and we use CertainTeed’s own starter strips, hip and ridge caps, and underlayment where the warranty requires. For vents and flashing, we use metal that meets or beats the product spec, and we’ll show you the difference if you ask.
- 4
Remove and replace. Old shingles come off, underlayment goes down, new flashing goes in at every transition. We don’t shingle over existing shingles on a Los Angeles roof installation, again because the heat and seismic movement don’t favor shortcuts.
- 5
Test and photograph. We run a nail-pattern audit, check every seal line, and photograph the finished roof from the top and from the street. You’ll see the same photos.
- 6
Written guarantee. Every CertainTeed roof installation carries our 365-Day Done Right Promise: if something isn’t right within a year, we make it right. That’s in writing, along with the price, before the job starts.
See the difference
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AfterWhat CertainTeed Roof Installation Costs in Los Angeles
Here are real ranges for common CertainTeed roof installation scenarios in Los Angeles. These aren’t placeholder numbers; they’re what we quote on weekdays when the roof sizes and access are typical.
- Small single-story home, Landmark, 1,200 – 1,500 sq ft roof area: $8,500 – $12,000
- Standard two-story home, Landmark Pro, 1,800 – 2,400 sq ft roof area: $12,000 – $16,500
- Luxury line (Presidential Shake or Grand Manor), 2,000+ sq ft roof area: $15,500 – $22,000+
- Steep-pitch or hillside install upcharge: +10 – 20% for staging, anchors, and slower labor
- Decking replacement: $70 – $110 per 4×8 sheet when rot or code requires it
What moves the price is the shingle line you choose, the number of layers being removed, the decking condition, and your roof’s pitch. In Los Angeles, permits and inspections on full roof installations are another $400 to $900 depending on the jurisdiction, and we pull them and pass them before the final invoice. Call (213) 521-8272 for an exact quote. Estimates are free.
Why Los Angeles Homeowners Call Mercer Roofing Co Los Angeles for CertainTeed Work
Most roofers can order CertainTeed shingles. What they don’t give you is a name and a photo of the person who shows up before that person rings your bell. Every Mercer Roofing Co Los Angeles technician is background-checked, identity-verified, and dressed in a clean, marked uniform with a photo ID badge at the door. Grant Whitlock owns this location, and he built the service around the moment the door opens, not just the moment the nail gun fires. We also install GAF and Owens Corning, so if a CertainTeed line isn’t the right fit for your budget or your building’s wind zone, we’ll tell you that instead of forcing the sale. A live person answers our phones 24/7, and our 365-Day Done Right Promise is written into every roofing installation contract. A roof should be the last thing on your mind – let’s keep it that way.
FAQs
CertainTeed’s material warranty covers manufacturing defects on the shingles themselves, and installing through an independent contractor like us doesn’t void that coverage as long as the work follows CertainTeed’s installation instructions. We won’t cut corners on the fastening pattern or underlayment that their warranty depends on. The labor side is covered by our own written guarantee, which is separate from CertainTeed’s material warranty and covers the work we do for 365 days.
Most architectural lines like Landmark and Landmark Pro reach the end of their useful life in Los Angeles at 18 to 25 years, while three-tab lines like the old XT 25 are done by 15 to 20. If your CertainTeed roof is past the 20-year mark and you’re getting multiple leaks per year, the replacement math usually favors a full roof installation over continuing repairs. Call (213) 521-8272 and Grant will give you an honest read on whether it’s time to replace or whether a few hundred dollars of repair buys you more years.
Yes, and we’ve done it on hillside homes in Silver Lake and Encino where the heavier look fits the architecture. The catch is that Presidential Shake is heavier than standard architectural shingles, so we have to confirm the existing decking and framing can carry the additional weight before we schedule anything. We’ll check that during the estimate and give you a written answer, not a maybe.
Landmark and Landmark Pro in common colors like Weathered Wood and Charcoal Black are usually available to our Los Angeles wholesalers same-week. Specialty colors and luxury lines like Grand Manor or Presidential Shake sometimes require a 1 to 2 week order lead time. We’ll tell you the timeline up front during the estimate so you’re not looking at a torn-off roof and no shingles.
If there’s no hidden rot or code issue we didn’t find during the inspection, the written price is the final price. The only legitimate change order on a CertainTeed roof installation in Los Angeles is decking replacement or structural work that no one could see until the old shingles came off. When that happens, we show you the rot, explain the cost with a written change order, and get your signature before any additional work begins. No one discovers a $4,000 surprise and then tells you after it’s done.
Written by Grant Whitlock, Owner, Mercer Roofing Co at Mercer Roofing Co Los Angeles, serving Los Angeles and nearby areas.