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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
CertainTeed Roofing in Westmont, CA | Spartan Roof Repair
We provide independent CertainTeed roofing service across Westmont, CA, from full Landmark shingle replacements to targeted flat-roof patches on the area’s older bungalows. What makes our CertainTeed work different here is simple: we know how these shingle lines and low-slope membranes behave under Westmont’s specific combination of Santa Ana wind uplift and intense basin UV. If your CertainTeed roof is leaking or losing shingles, call Spartan Roof Repair at (855) 382-3237 for a straight diagnosis and a free estimate.
Why Westmont Residents Choose Us for CertainTeed Service
CertainTeed makes a wide product line, and servicing it properly means knowing which shingle belongs on which roof. We work with CertainTeed sales & service across seven major roofing brands, but our CertainTeed knowledge runs deep because Westmont’s housing stock demands it. Landmark architectural shingles on a 1950s tract home, XT-series three-tabs on a 1920s stucco bungalow, Flintlastic SA on a post-war flat roof: each installation ages differently, and each failure mode has a different fix.
Brent Calloway, our owner, grew up a few blocks from TeWinkle Park in Eastside Costa Mesa and learned roofing fundamentals through Orange Coast College’s construction technology program, on mock structures with real materials and instructors who didn’t tolerate shortcuts. He’s been on Westmont roofs for over two decades, and that’s the standard every crew member works to. We inspect it, we repair it, we replace it, all under one roofing-only roof.
Styles & brands we work with
Common CertainTeed Roofing Problems We Solve in Westmont
These are the failure patterns we see repeatedly on CertainTeed roofs in Westmont. Each one is tied to a specific local condition, not a generic roofing issue.
- Santa Ana wind lift on Landmark and Patriot shingles. Westmont’s fall and winter wind events hit windward slopes hard. On 15 – 25 year old installs, the thermal seal on CertainTeed Landmark and Patriot shingles has cycled loose under years of UV, and the tabs lift and tear at the sealant strip. We re-secure salvageable courses with wind-rated fasteners and replace what’s beyond saving.
- Granule scour and balding on XT-series three-tabs. Westmont’s 1920s – 1950s bungalows often still carry CertainTeed XT 25 or XT 30 shingles. South and west faces take relentless basin sun, and those shingles granule-scour and bald, exposing the asphalt beneath. Once brittleness sets in, the first strong wind fractures the tabs. This is rarely a patch job; it usually calls for a full slope replacement.
- Nail-high and overdriven fastener failures. Improper original installation creates hinge points through the shingle. When the first strong fall wind hits, the tab cracks at the common bond. We see this on Westmont tract homes where the original install was rushed. The fix is replacing the damaged courses and re-fastening at the correct height, not just adding more nails.
- Flintlastic SA seam failures on post-war flat roofs. Westmont has a high concentration of flat and low-slope roofs from the 1940s and 50s. Flintlastic SA self-adhered modified bitumen fails at lap seams and perimeter terminations when the original substrate dries and the adhesive bond shears. These are the same seam leaks we see on old tar-and-gravel surfaces.
- Shingle-to-flat-roof transition leaks. This is the Westmont signature issue. Many homes here have a shingled slope meeting a flat-roof section, and that transition detail fails first. The original tar dries and cracks, water works under the shingles, and the leak shows up somewhere unexpected. We repair the transition and the affected shingle courses together.
CertainTeed Service in Westmont: What Local Conditions Mean for Your Roof
Westmont sits in the South LA basin, where the dry season combines with Santa Ana winds to turn any loose or aging roofing material into a wind-borne hazard. Unlike neighboring cities with more tile roofs or steeper pitches, Westmont’s roofing work is often about securing lightweight asphalt shingles and flat roofs against seasonal wind events and intense UV exposure. What this means for CertainTeed owners specifically — including those who need CertainTeed repair in Hawthorne or nearby South LA basin cities — is that a roof that looks fine from the street may have failing sealant strips hidden under the tabs, or dried-out flat-roof seams waiting for the next wind event to finish the job.
The 1920s – 1950s stucco bungalows and post-war tract homes throughout the 90047 ZIP carry an unusual mix: low-slope shingled sections butted against original flat-roof additions. That transition detail, where shingle meets tar-and-gravel or old modified bitumen, fails before anything else because the two materials expand and contract at different rates under Westmont’s heat. We frequently detail a shingled slope against a flat-roof section on the same house, and if that transition hasn’t been properly flashed and sealed with modern materials, it’s the first place water gets in. A generic CertainTeed page won’t tell you this; a generic Westmont page won’t either. This is what we see on actual roofs here.
CertainTeed Models & Products We Service in Westmont
We install and repair the CertainTeed product lines most common on Westmont homes:
- CertainTeed Landmark architectural shingles. The heavier architectural line we recommend when a full replacement makes sense and the deck can carry the weight. Wind-rated fastening matters enormously on Westmont’s windward slopes.
- CertainTeed XT 25 / XT 30 three-tab shingles. Still found on many older bungalows. We match them where the field is salvageable, and we’re honest when the brittleness means replacement is the only real fix.
- CertainTeed Patriot architectural shingles. A mid-weight architectural option that fits modest tract home budgets without sacrificing wind resistance.
- CertainTeed Flintlastic SA self-adhered modified bitumen. The low-slope membrane we use on Westmont’s post-war flat roofs, including seam repairs and full re-covers.
For parts, we use genuine CertainTeed shingles and accessories — the same quality we bring to our Willowbrook CertainTeed service — matching the existing line when the field is salvageable. We pair them with quality aftermarket underlayments and wind-rated fasteners. We repair when the failure is isolated to one slope or seam, and we recommend full replacement when shingle brittleness or decking rot has spread beyond a reasonable patch. That’s the honest call, and it’s the only call we make.
See the difference
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AfterCertainTeed Service Pricing in Westmont
CertainTeed shingle replacement in Westmont typically runs $220 – $420 per square (100 sq ft) for labor and materials on a standard slope, depending on the shingle line and the condition of the existing underlayment. Flat-roof seam repairs and Flintlastic SA patches usually fall between $450 and $1,200 depending on the size and number of failed seams. Flashing repair at the shingle-to-flat-roof transition generally costs $180 – $480, which is one of the most common repairs we do in Westmont.
What drives the cost: the pitch and height of your roof for safety equipment, the depth of UV damage to the existing shingles, and whether the decking underneath has rot that needs replacement. Our free estimate includes a written line-item breakdown, and we walk you through which items are urgent and which can wait. There is no pressure, no narrative, no upsell. Call (855) 382-3237 for an exact quote.
Serving Westmont, CA — Our Local Coverage Area
We’re based in the Westmont area and also provide CertainTeed in West Athens, Hawthorne, Willowbrook, and Florence-Graham. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – CertainTeed Roofing in Westmont
Yes, we install CertainTeed Landmark architectural shingles on low-slope bungalow roofs where the pitch meets the manufacturer’s minimum slope requirement, with proper underlayment and wind-rated fastening. For roof sections with a pitch below what Landmark allows, we switch to Flintlastic SA self-adhered membrane or another appropriate low-slope system. The slope determines the product, not habit. Call (855) 382-3237 for a slope check and a straight answer.
If the tabs lifted at the sealant strip but the shingles still have granule coverage and flexibility, we can re-secure them with wind-rated fasteners and adhesive, often extending the roof’s life by several years. If the shingles are brittle, balding, or cracking at the nail line, re-sealing won’t hold, and a full slope replacement is the only durable fix. The condition of the shingle, not the wind event, decides it. We’ll show you the difference on the roof. Call (855) 382-3237 to schedule a free inspection.
We locate the failed seam or perimeter termination, remove the failed adhesive or dried tar, and patch with CertainTeed Flintlastic SA or a compatible modified bitumen, properly rolled and sealed. Most Westmont flat-roof leaks we see are seam failures, not full membrane failures, which means a targeted patch usually solves the problem. If the membrane has cracked through in multiple places, we’ll tell you straight that a re-cover makes more sense. Call (855) 382-3237 and we’ll assess it from the roof, not from a guess.
Yes, we match the existing CertainTeed color and line where the shingle is still in production, and we can source matching stock locally for faster turnaround on Westmont repairs. Older XT-series colors that have been discontinued present a harder match, and in those cases we’ll show you the closest available option and the visual difference before any work starts. Honest matching, not a surprise patch. Call (855) 382-3237 to check what we can source for your roof.
No, we are an independent contractor, which means we’re not authorized, sponsored, or warranted by CertainTeed. What that independence gives you is the ability to specify the right CertainTeed product for your Westmont roof — or our Florence-Graham CertainTeed service area — based on performance, not a dealer agreement. We buy genuine CertainTeed shingles and accessories, install them correctly, and carry a workmanship warranty on our labor. The roof doesn’t need a dealer badge to be done right.
Service Areas Near Westmont
Spartan Roof Repair serves Westmont and the surrounding South LA basin communities. If you’re in Westmont service area, we’re already familiar with the housing stock, the wind patterns, and the roof types. We also handle CertainTeed work in CertainTeed service in Redondo Beach and CertainTeed service in Baldwin Park, plus nearby Bellflower, Paramount, and Norwalk. If you’re within the 90047 area or in an adjacent South LA neighborhood, give us a call.
Book Your CertainTeed Service in Westmont Today
Your roof doesn’t need a speech. It needs a fix. If your CertainTeed shingles are lifting, your flat-roof seams are leaking, or you just want a straight assessment of what’s left in your roof, call Spartan Roof Repair at (855) 382-3237 to schedule your free estimate. We serve all of Westmont, CA, zip code 90047, and we’re ready when you are.
Written by Brent Calloway, Owner at Spartan Roof Repair, serving Westmont and the South LA basin for over two decades.