Metal roofing
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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Installation Across West Hills
Roof installation in West Hills means choosing materials that survive a very specific microclimate: morning marine-layer salt air, intense afternoon UV, and Santa Ana gusts that tear at eaves and rakes. Most West Hills homes were built between the 1950s and 1970s, and many of those original wood shake roofs are now at the end of their service life. That’s where our Roof Installation team comes in. We tear off the old, rebuild the decking where it’s rotted, and install systems spec’d for this exact climate – not the generic inland package that fails early here. Call (341) 217-2677 to talk through your roof, or keep reading to learn what actually holds up on a West Hills roofline.
Why Mercer Roofing Co Woodland Hills Is West Hills’s Preferred Roof Installation Company
Mercer Roofing has been part of the Threshold Group family since 2000, and every roof we install in West Hills carries the 365-Day Done Right Promise in writing. If anything isn’t right within a year, we make it right. That’s not a slogan; it’s on every contract. Homeowners along Saddlebow Road, Valley Circle Boulevard, and the streets off Roscoe tell us the same thing: they wanted a company that would show up looking like professionals, not strangers.
Before any technician arrives at your home in West Hills, you get their name and photo by text or email. They arrive in a clean, marked uniform and show a photo ID badge at the door. Every Mercer technician is background-checked and identity-verified under the Threshold Verified standard. That matters if you’re home alone, if you’ve got young kids, or if you simply don’t like opening the door to someone you can’t verify. You’ll know who’s coming before they ring the bell.
Our crews serve West Hills directly, coordinated from our Los Angeles office. We answer the phone with a live person, 24/7 – not a voicemail tree. When a homeowner calls about a leak in the middle of a Santa Ana wind event, a real human picks up. That’s the kind of responsiveness West Hills residents expect, and it’s what we deliver.
Styles & brands we work with
Roof Flashing Installation in West Hills
Roof flashing installation in West Hills is the single most important line of defense against the marine layer’s salt-laced morning fog. Flashing is the metal – typically at chimneys, vents, skylights, and anywhere the roof plane meets a wall – that directs water away from penetrations. In most inland parts of the Valley, standard galvanized flashing holds up reasonably well. In West Hills, we’ve pulled flashing off roofs that was corroded to lace within 8 to 10 years. The salt in that morning moisture accelerates galvanic corrosion in a way you just don’t see a few miles north in Canoga Park or Winnetka. A proper flashing installation here uses 26-gauge stainless steel at all penetrations, which typically runs $1,200 to $2,800 depending on how many chimneys, vents, and skylights your roof has.
Chimney and Vent Flashing
On mid-century ranch homes throughout West Hills, chimney flashing failures are the most common entry point for water. The original flashing was often thin galvanized steel, and after decades of salt-laced fog it’s rotted through at the corners and lap joints. We replace it with stainless steel and seal the counter-flashing into the mortar with a polyurethane sealant.
Skylight Flashing Kits
Skylights are rare on original 1950s and 60s West Hills homes, but many have been added over the years. The flashing kits supplied with older skylight models often used aluminum or thin galvanized metal, which fails in this microclimate long before the skylight itself. When we install a new skylight or re-flash an existing one, we spec a stainless steel kit matched to the manufacturer’s curb dimensions.
TPO Roofing Installation in West Hills
TPO roofing installation in West Hills is best suited to the low-slope and flat roof sections that dominate mid-century ranch homes built from the 1950s through the 1970s. TPO – thermoplastic polyolefin – is a single-ply membrane that gets heat-welded at the seams, forming a single continuous surface. That’s critical here, because the same properties that make West Hills roofs vulnerable to wind-driven rain also make them vulnerable to ponding: low-slope sections collect water after winter storms, and if the membrane seams aren’t welded watertight, you get leaks. A full TPO installation on a typical West Hills flat or low-slope section runs $6,500 to $14,000 depending on square footage, decking repairs, and whether we’re removing old material or laying over an existing clean surface.
Heat-Welded Seams vs. Adhesive
We heat-weld TPO seams rather than using adhesive, because welded seams form a chemical bond that is virtually impossible to pull apart. Adhesive-based systems rely on glue that degrades faster under West Hills’ intense UV exposure. The welded seam is the same material as the membrane itself, so it expands and contracts at the same rate when daytime heat swings hit 100 degrees and nights drop into the 50s.
Ponding Water on Low-Slope Sections
Ponding is a common issue on West Hills ranch roofs, particularly where the carport or covered patio meets the main roof plane. Standing water that sits for more than 48 hours after rain accelerates membrane aging. We address this by installing tapered insulation under the membrane where needed, directing water toward existing drains or scuppers so it doesn’t sit.
Trusted Brands We Service in West Hills
We install and repair roofing systems from manufacturer-recognized brands including GAF, CertainTeed, Owens Corning, and Boral, among others. For West Hills specifically, we keep a strong local inventory of IKO and Atlas shingle lines that carry Class A fire ratings – a requirement for homes in the county’s Wildland-Urban Interface zones. We also work with Tamko products where homeowners prefer a dimensional shingle look. Because we serve West Hills regularly, we don’t have to special-order the materials that this climate demands. That means faster turnaround when your roof needs attention now.
See the difference
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AfterCommon Roof Installation Problems We See in West Hills Homes
- Corroded galvanized flashing at roof penetrations. The morning marine layer carries salt air that eats standard galvanized flashing in under a decade. We see this on chimneys, furnace vents, and plumbing stacks throughout West Hills, and we replace it with stainless steel during every installation.
- Premature granule loss on asphalt shingles. Intense UV during West Hills’ hot, dry summers combined with morning moisture causes granules to slough off years earlier than in Woodland Hills or Canoga Park. A 30-year shingle can look like a 20-year shingle here, which is why we spec shingle lines with higher granule adhesion when homeowners want maximum service life.
- Wind-driven uplift at eaves and rakes. Santa Ana winds gusting over 60 mph rip poorly nailed starter strips and drip edge off low-slope ranch sections. We use a six-nail pattern per shingle on wind-rated installations and hand-seal starter strips along the entire eave line.
- Wood shake roofs at end of life. West Hills has a significant number of original wood shake roofs from the 1950s through 1970s. Many are now failing, and Los Angeles County’s Wildland-Urban Interface codes require replacement with Class A fire-rated materials – not another wood shake.
Pricing for Roof Installation in West Hills, CA
A complete tear-off and re-roof on a mid-century ranch in West Hills typically runs $14,000 to $28,000, depending on square footage (most ranch homes here are 18 to 32 squares), decking repairs, and the material system you choose. For comparison, a basic asphalt shingle re-roof without decking replacement on a smaller ranch runs $12,000 to $18,000, while a high-end system with stainless steel flashing, full decking replacement, and Class A fire-rated shingles runs $22,000 to $32,000. Flashing-only work typically runs $1,200 to $2,800, and flat or low-slope TPO sections run $6,500 to $14,000. Every project begins with a written price before any work starts. No conditional estimates, no invoice surprises. Call (341) 217-2677 to schedule your free estimate – Grant Whitlock leads our team and makes sure your written price reflects exactly what we discussed.
We Also Serve Cities Near West Hills
Our roofing crews serve West Hills and the surrounding communities, including Canoga Park, Woodland Hills, Winnetka, and Calabasas. If you’re in one of these nearby areas and need a roofing contractor who understands the local microclimates that affect roof life, we’re the team to call.
Serving West Hills, CA - Our Local Coverage Area
We’re based in the West Hills area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Roof Installation in West Hills
Stainless steel flashing, hot-dip galvanized fasteners, and Class A fire-rated asphalt shingles with high granule adhesion hold up best in West Hills. Standard galvanized flashing fails here in 8 to 10 years because the morning marine layer carries salt that accelerates corrosion. We spec 26-gauge stainless at every penetration and use fasteners rated for coastal exposure. For the membrane itself, modern architectural shingles from GAF, CertainTeed, Owens Corning, IKO, and Atlas all perform well when installed with the correct ventilation – it’s the metal and the fasteners that fail first in this specific microclimate, not the shingle itself. Call (341) 217-2677 to get a written price on a system spec’d for West Hills conditions, not generic inland standards.
West Hills sits at a specific elevation where morning marine-layer moisture from the coast meets intense afternoon UV and Santa Ana winds. That combination causes asphalt shingle granules to slough off years earlier than in neighboring Woodland Hills or Canoga Park. The morning moisture softens the asphalt layer, the afternoon sun bakes it, and the cycle repeats hundreds of times per year. A 30-year shingle can show significant granule loss within 15 to 18 years in West Hills. That’s why we recommend shingle lines with enhanced granule adhesion for this area, and why we always discuss ventilation during a roof installation estimate. Call (341) 217-2677 for an exact quote – estimates are free.
Yes, in most cases you can install Class A fire-rated shingles over an existing wood shake roof in West Hills, provided the decking beneath the shakes is sound and the shakes are not severely cupped or rotted. However, many homeowners choose full tear-off because the original decking under 1950s and 60s wood shakes is often particleboard or thin plywood that has delaminated from decades of trapped moisture. We inspect the decking during the estimate and give you a written recommendation either way. No work starts without a written price, and no change orders appear later. Call (341) 217-2677 to schedule your free inspection.
Most mid-century ranch homes in West Hills run 18 to 32 squares (a square is 100 square feet of roof area). The exact count depends on the footprint, the roof pitch, and whether there’s a covered patio or carport that’s been incorporated. A standard 1,800-square-foot ranch with a low-slope roof typically runs 22 to 28 squares. We measure precisely during the free estimate and give you a written line-item price based on that exact square count, not a rounded guess. Call (341) 217-2677 to book your measurement.
Wind-rated shingle installations in West Hills require a six-nail pattern per shingle (up from the standard four-nail), hand-sealed starter strips along the entire eave line, and properly fastened drip edge at both eaves and rakes. Santa Ana gusts over 60 mph create uplift at the roof edges, and the starter strip is what keeps the first course from peeling back. We use six nails per shingle on every wind-rated installation in West Hills, and we document it in the written scope of work. If you’d like a roof that’s spec’d for the actual wind loads your home faces, call (341) 217-2677 to schedule a free estimate.
Ready to talk about your roof? Call (341) 217-2677 for a free estimate. Grant Whitlock and the Mercer Roofing team serve West Hills homeowners with written prices, background-checked technicians who show photo ID at the door, and the 365-Day Done Right Promise on every installation. We’re available 24/7 – a live person answers the phone, not a machine.
Written by Grant Whitlock, Owner at Mercer Roofing Co Woodland Hills, serving West Hills and the surrounding San Fernando Valley.