CertainTeed Roofing Company Nationwide

CertainTeed Roofing Company in Los Angeles: What to Know First

Mercer Roofing provides independent CertainTeed roofing repair, replacement, and inspection across Los Angeles, from Sylmar down to Long Beach and everywhere between. Most CertainTeed repairs run between $350 and $1,400 depending on what failed, and we give you a written price before any work starts, so you know the number before the ladder goes up. If you own a CertainTeed roof and something looks wrong, call (743) 200-8347 and a live person will answer, day or night.

Call (743) 200-8347

This page is for Los Angeles homeowners who need an honest read on a CertainTeed roof. We’re an independent CertainTeed service provider, not a manufacturer-authorized dealer, which means we tell you what’s actually wrong and what actually needs fixing, even when the answer is “less than you think.” Grant Whitlock, our owner, learned roofing at Los Angeles Trade-Technical College downtown and has spent nearly two decades on LA rooftops. He’ll be the first to tell you CertainTeed makes a solid shingle, but this city has a way of finding the weak spot.

How CertainTeed Products Fail – and How We Fix Them

CertainTeed makes dependable roofing, but every product line has patterns. Here’s what we actually see on Los Angeles roofs, neighborhood by neighborhood:

• Landmark shingle granule loss near coastal zones. CertainTeed’s Landmark series holds up well inland, but in neighborhoods like Playa del Rey and San Pedro, salt air and persistent morning fog accelerate granule shedding. You’ll see a section of roof that looks lighter than the rest, like it’s fading faster. That’s not cosmetic, it’s the protective layer wearing thin. We inspect the affected slope, replace only the compromised shingles when possible, and check the underlayment beneath for moisture intrusion before it reaches the decking.
• Presidential Shake lifting at the nose. CertainTeed’s thicker Presidential Shake line looks great on hillside homes in Mount Washington and Eagle Rock, but those same hillside winds find the leading edge. We see shingles that have lifted slightly at the bottom corner, not enough to see from the ground, but enough to catch the next Santa Ana gust and peel back in sheets. The fix is resealing with a proper asphalt-based adhesive, not a hardware store caulk, and adding mechanical fasteners where the original nail pattern has loosened.
• Flintlastic self-adhered membrane pulling away at the parapet walls. On flat and low-slope roofs, CertainTeed’s Flintlastic system is common, and so is this failure: along the parapet wall transition, the membrane releases from the vertical surface after repeated LA heat expansion cycles. Water finds its way behind the membrane and you won’t see a leak inside until it’s been pooling for months. We strip back the affected area, re-prime the substrate with the correct CertainTeed-compatible primer, and torch or cold-apply the new membrane per manufacturer specification.
• Carriage House shingle cracking from UV overload. The Carriage House line is a beauty on Craftsman homes in Pasadena and Highland Park, but those homes often have older roof decking with less ventilation. Attic heat builds, transfers to the shingles, and the asphalt over-bakes. We find hairline cracks running perpendicular to the shingle edge. Replacement is the only real fix for a cracked shingle, and we’ll also check your attic ventilation because if that goes unaddressed, the new shingles will fail the same way in five years.
• WinterGuard ice and water shield degradation under tile in the foothills. Here’s one specific to our microclimates. In the San Fernando Valley foothills, where Grant grew up in Sylmar, homes with CertainTeed tile roofs often have WinterGuard or DiamondDeck underlayment beneath the tile. After 15 to 20 years of extreme temperature swings between summer highs and cold winter nights, that underlayment becomes brittle and tears at the batten nails. The tile above looks fine, but the waterproof barrier is gone. We see this during roof inspections and it’s why we always check the underlayment, even when the tile looks pristine.

Our CertainTeed Roofing Company Process

Here’s what happens when you call Mercer Roofing for CertainTeed work in Los Angeles:

1. 1
   You call, a person answers. No voicemail tree, no callback form. We take your information, ask what you’re seeing, and schedule a visit at a time that works for you.
2. 2
   You know who’s coming. Before the technician arrives, we send their name and photo. They show up in a clean Mercer uniform and badge in at the door with a photo ID. No surprises, no unmarked trucks.
3. 3
   We diagnose on the roof, not from the driveway. Our technician walks the roof, checks the specific CertainTeed product you have, and identifies the failure. We look at flashing, underlayment, decking, and ventilation, because a shingle problem is often a system problem.
4. 4
   You get a written price, item by item. We explain the options: OEM CertainTeed components when it matters for warranty and performance, and quality aftermarket equivalents when the difference is negligible and the savings are real. You decide before we touch anything.
5. 5
   We do the repair, test it, and document it. After the fix, we run water over the area when practical and photograph the completed work. You get a written guarantee covering every repair for 365 days.
6. 6
   If it fails within a year, we come back free. That’s the Done Right Promise. One year, written down, on every repair we do.

What CertainTeed Roofing Company Costs in Los Angeles

Los Angeles pricing for CertainTeed work varies by what actually failed. Here are the ranges we quote most often:

• Individual shingle replacement: $350 to $650, depending on roof pitch and accessibility
• Flashing repair or replacement: $400 to $900 for chimney, valley, or wall flashing
• Localized leak repair with underlayment patch: $700 to $1,400
• Full CertainTeed Landmark roof replacement: $14,000 to $32,000 for a typical Los Angeles single-family home, varies by square footage and decking condition
• Roof inspection (written report with photos): $250, credited toward repair work if you proceed

What moves the price: roof pitch (walkable vs. steep), number of stories, whether decking needs replacement, and whether you have a tile or shingle CertainTeed system. We’ll give you the exact number before any work begins, and that number will not change unless we find something structural underneath that requires your sign-off. Call (743) 200-8347 to schedule your free estimate.

Why Los Angeles Homeowners Call Mercer Roofing for CertainTeed Work

Most roofing companies will work on any brand. We work on CertainTeed specifically because we know its lines, its weak points, and how Los Angeles weather treats each one differently. But the bigger reason homeowners call us: they know exactly who’s walking up the driveway. Every technician is background-checked, identity-verified, and photo-badged under the Threshold Verified standard. Before they arrive, you’ve already seen their face. When they knock, they show ID. When they quote, it’s in writing. When they finish, you have a 365-day guarantee.

We also install and repair GAF and Owens Corning systems, so if your CertainTeed roof isn’t worth saving, and sometimes it isn’t, we’ll tell you that honestly and give you options without pushing a replacement you don’t need. Founded in 2000 and part of the Threshold Group family, we answer the phone 24/7 because a roof doesn’t care if it’s midnight on a Sunday. A roof that’s doing its job is one you never think about. Let’s keep it that way.

FAQs