Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterTrusted Roof Installation Nationwide
A new roof is one of the biggest single investments you’ll make in your home, and the difference between a roof that lasts 30 years and one that fails in 12 often comes down to who installs it and how. For a deeper look at what the process involves, see The Complete Roof Installation Guide for Los Angeles Homeowners. Mercer Roofing has installed and replaced roofs across the United States since 2000, and we approach every job the same way: with a written price before any work starts, a background-checked technician whose name and photo you receive before the doorbell rings, and a 365-Day Done Right Promise on every installation. When you call (743) 200-8347, a live person answers, and that person can walk you through exactly what to expect, from the first measurement to the final inspection.
Shingle Roof
A shingle roof is the most common roofing system in American homes, and for good reason: it balances upfront cost, lifespan, and repairability better than almost anything else on the market. When your existing shingle roof shows curling, granule loss, or leaks around penetrations, replacement becomes the practical choice, and Mercer Roofing handles the full tear-off and installation process from decking inspection through final ridge cap. A full shingle roof installation typically runs $8,500 to $18,000 for an average single-family home, with the final number depending on roof pitch, layers being removed, and the shingle line you select.
Architectural Shingle Systems
Most homeowners we work with choose architectural shingles over three-tab because the dimensional profile hides minor decking irregularities and adds curb appeal that three-tab simply cannot match. We install GAF, CertainTeed, Owens Corning, and Atlas architectural lines, and we’ll walk you through the real cost difference, which is often smaller than people expect when you factor in lifespan.
The Hidden Layer That Determines Shingle Life
Underlayment is the waterproof barrier between your decking and the shingles themselves, and it’s where budget installations quietly cut corners. On every shingle job, Mercer specifies synthetic underlayment rather than builder-grade felt because it resists tearing during installation and provides a secondary water barrier if wind ever lifts a shingle.
Standing Seam Metal Roof
A standing seam metal roof is a premium roofing system built from interlocking vertical metal panels with concealed fasteners, and it’s the right call for homeowners who want a 40-to-60-year roof and are willing to invest more upfront. You’ll know it’s time when you want to stop re-roofing every 15 to 20 years, when your roof pitch creates ice-dam risk that asphalt struggles with, or when long-term energy savings and durability justify the higher initial cost. A standing seam metal roof installation typically runs $18,000 to $38,000 for an average home, with gauge thickness, panel width, and roof complexity moving the needle more than anything else.
Concealed Fastener Advantage
Unlike exposed-fastener metal roofing, standing seam panels attach with clips hidden beneath the seam, which means no screw penetrations to back out or leak over decades of thermal expansion and contraction. This is the detail that separates a 20-year metal roof from one that genuinely reaches its 50-year design life.
Metal Roof Engineering and Expansion
Metal expands and contracts with temperature swings, and a proper standing seam installation accounts for that movement in every flashing detail and clip spacing decision. Our crews set clip spacing to the panel manufacturer’s engineering table, not a one-size-fits-all pattern, because even a small error there shows up as oil-canning or seam stress within a few seasons.
Tile Roof
A tile roof is what you’ll find on millions of homes in warmer climates and on higher-end builds everywhere, and it’s a system where the tiles themselves are only half the story: the underlayment and attachment method do the actual waterproofing work. When tile roofs fail, it’s rarely the tile that breaks down; it’s the felt or fasteners underneath, and a full tile roof installation means stripping everything to the deck and rebuilding the system correctly. Expect a tile roof installation to run $25,000 to $45,000, with clay running higher than concrete and roof structure reinforcement sometimes adding cost on older homes.
Clay vs. Concrete Tile Tradeoffs
Clay tile carries a higher price and a longer color-fast lifespan, while concrete tile offers similar storm protection at a lower cost per square foot. We’ll give you honest numbers for both options and help you weigh the aesthetic difference against the budget difference without pushing you toward either one.
Why Underlayment Matters More Than the Tile
The tile layer is a wear surface, not the waterproofing layer, and that distinction drives every decision we make on a tile roof installation. Mercer specifies a double-layer or high-performance synthetic underlayment system on tile jobs because once the tile goes down, accessing that layer for repair means removing everything above it.
Roof Ventilation
Roof ventilation is the system of intake and exhaust points that keeps your attic dry and your roof deck from cooking itself, and it’s a component that gets installed wrong more often than any other part of a roofing system. When you see premature shingle curling, attic mold, or ice dams in winter, inadequate ventilation is usually a contributing factor, and correcting it during a roof installation is far cheaper than retrofitting it later. Roof ventilation work during a full installation typically adds $600 to $1,800, and Mercer treats it as a core part of every roof we install, not an add-on we try to upsell.
Balanced Intake and Exhaust
A ventilation system works only when intake at the eaves and exhaust at the ridge are balanced, and a ridge vent without adequate soffit intake actually pulls conditioned air out of your living space instead of ventilating the attic. We calculate net free vent area for every job and adjust the system to the specific roof geometry we’re working with.
Attic Temperature and Shingle Lifespan
An attic that runs hot all summer bakes shingles from below and can reduce an asphalt roof’s service life by years, which is a failure most homeowners never connect to ventilation. Mercer’s standard installation includes a ventilation assessment because we’d rather point out a problem before the roof goes on than explain a premature failure after it.
Roof Flashing Installation
Roof flashing installation is the waterproofing work around every penetration and transition on your roof, including chimneys, skylights, vents, and walls, and it’s where the majority of roof leaks actually begin. Flashing fails because sealant dries out, metal corrodes, or the original installation was never lapped correctly, and when we replace a roof, we replace every piece of flashing rather than trying to reuse aged material. Flashing installation as part of a roof replacement typically runs $1,200 to $3,500 total, with chimney and skylight work adding the most cost.
Step Flashing at Wall Intersections
Where a roof meets a sidewall, step flashing woven in with each shingle course is the only correct method, and skipping it in favor of a long run of caulk is a guaranteed future leak. Our crews cut and bend flashing on-site for the specific geometry of your roof, because pre-formed pieces rarely match what the house actually requires.
Common Leak Points We Replace Every Time
Chimneys, plumbing vents, and skylights account for most flashing failures we see, and each one needs a different approach: counter-flashing cut into mortar joints, pipe boots sized to the vent, and continuous membrane under skylight frames. On a Mercer installation, flashing is never a leftover or an afterthought; it’s part of the written scope before work begins.
TPO Roofing Installation
TPO roofing installation is the process of installing a single-ply thermoplastic membrane, usually on flat or low-slope commercial and residential structures, using heat-welded seams that create a watertight surface. You need TPO when a flat roof has reached the end of its service life, when you’re tired of patching an old built-up or modified bitumen roof, or when you want a reflective white surface that lowers cooling loads in summer. TPO roofing installation typically runs $7 to $11 per square foot installed, which puts most single-family flat roof installations between $9,000 and $16,000.
Heat-Welded Seam Strength
TPO seams are welded with hot-air equipment that fuses the membrane layers into a single piece, and when the weld is done at the right temperature and speed, the seam is stronger than the membrane itself. Our crews test weld settings at the start of every day on scrap material before touching the roof, because every manufacturer’s membrane welds slightly differently.
Flat Roof Drainage Design
A flat roof isn’t actually flat, and a proper TPO installation includes correcting the slope or adding tapered insulation so water moves toward drains or scuppers instead of ponding. Standing water is the fastest way to shorten a TPO roof’s lifespan, and we address drainage before the membrane goes down rather than hoping the existing slope works.
Brands We Service
We install and repair CertainTeed roofing products because they offer a deep lineup that lets us match the right shingle to the right budget and climate without compromise. CertainTeed’s architectural shingle lines are workhorses, and we’ve installed enough of them to know which specific models hold up best under high wind and which are better suited to milder conditions.
Owens Corning is another brand we work with regularly, and their Duration series is one of the better values in the architectural shingle category for homes that see real weather. We also work with Atlas and IKO on a regular basis, and whether you have a CertainTeed, Owens Corning, Atlas, IKO roof or any other make, we can inspect it, price a replacement, and install the right system for your home. Our crews train on manufacturer installation specs rather than taking a generic approach, because a 30-year shingle installed with 20-year methods is still a 20-year roof.
Signs You Need a Pro Right Now
- Daylight visible through the roof deck. If you can see light coming through the attic boards, water is already getting in. That’s not a repair situation; it’s a replacement situation, and every rainstorm is doing damage you can’t yet see from inside the house.
- Shingle granules in the gutters. A thin layer of granules is normal on a new roof. Heavy granule loss that piles up in the gutter or shows bare patches on the shingle surface means the asphalt layer is failing and the shingles are nearing the end of their life.
- Sagging roof plane between rafters. A visible dip or wave in the roofline usually means the decking has absorbed moisture and lost its structural strength. That’s a safety issue that will only get worse, and it needs a professional assessment now, not next season.
- Water stains on ceilings or exterior walls. An interior stain is the end of a long line; the water has been working through the roof for a while before it shows up inside. The leak source is rarely directly above the stain, which is why tracing it correctly matters.
- Flashing pulling away from the chimney or walls. Lifted or corroded flashing lets water run behind the roof covering and into the house. Caulking over it is a temporary patch that fails fast; the fix is removing and replacing the flashing properly.
Our Process, Step by Step
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Call and talk to a live person. When you call (743) 200-8347, you’ll reach a human being, not a voicemail system. We’ll ask about your roof, your timeline, and what you’re seeing, and schedule a visit from a technician whose name and photo we send you before anyone arrives.
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Meet your technician at the door. Your technician arrives in a clean, marked uniform and presents a photo ID badge before stepping inside. Every Mercer technician is background-checked and identity-verified under the Threshold Verified standard, and you’ll know exactly who’s walking up the driveway ahead of the visit.
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Get a written price before any work starts. We inspect the roof, take measurements, and walk you through what we found and what the job requires. You receive a written line-item price before a single nail is driven, and that price is what you pay; there are no surprises on the invoice.
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Installation with manufacturer-spec methods. The crew handles tear-off, decking repair, underlayment, flashing, and the new roof system using the manufacturer’s current installation specifications, not shortcuts. We keep the site clean and walk you through what’s happening at each stage.
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Final walkthrough and written guarantee. When the work is done, we walk the roof with you and document the finished installation. Every installation is covered by the 365-Day Done Right Promise: if it’s not right within a year, we make it right.
How Much Does Roof Installation Cost?
Our Roof Installation in Los Angeles and across the United States typically runs $8,500 to $45,000 depending on the material and the home. Shingle roofs sit on the lower end at $8,500 to $18,000, standing seam metal roofs run $18,000 to $38,000, and tile roofs can reach $25,000 to $45,000 on complex or high-pitch homes. The wide range is driven by square footage, roof pitch, the number of existing layers being removed, and the condition of the decking underneath.
What moves the price most is whether the decking needs replacement, how many penetrations and valleys the roof has, and the material grade you select. A roof with six dormers, a chimney, and three skylights costs more than a simple gable roof with the same footprint. The way to avoid overpaying is to get line-item pricing that separates materials, tear-off, decking, flashing, and ventilation, so you can see where the money goes and compare quotes on an apples-to-apples basis. A free estimate from Mercer Roofing includes that breakdown, and we’ll point out where quotes often hide costs so you can evaluate any bid with confidence. Call (743) 200-8347 to schedule yours.
Where We Work
Mercer Roofing serves homeowners and businesses across the United States through local, independently owned and operated crews working under the Threshold Verified standard. Each location is held to the same background-check, photo-badge, and written-price requirements, so the experience is consistent no matter where you live. A live person answers the phone 24/7, and your technician’s name and photo arrive before the visit.
Frequently Asked Questions About Roof Installation
Roof installation is the complete process of removing an existing roof covering and installing a new roofing system, including decking repair, underlayment, flashing, ventilation, and the finished surface material. It’s different from a roof repair because it addresses the entire roof system rather than a single problem area. Mercer Roofing has performed full roof installations across the United States since 2000, including Roof Installation in Huntington Park.
Most residential roof installations take two to five days depending on the square footage, pitch, material, and whether the old roof has to be stripped to the deck. Shingle roofs on average homes are usually done in one to three days, while tile and metal installations run longer. We’ll give you a specific timeline in the written estimate so you know what to expect before work starts.
Roof installation costs range from about $8,500 for a straightforward shingle roof to $45,000 for a complex tile installation, with metal roofs between those two points. The exact price depends on your home’s size, roof geometry, material choice, and decking condition. Call (743) 200-8347 for a written quote; our estimates are free and the price we write is the price you pay.
We install and service shingle, standing seam metal, tile, and TPO roofing systems, and we work with manufacturer-recognized brands including GAF, CertainTeed, Owens Corning, IKO, Atlas, and Tamko. Whatever roofing system you have or want, we can assess it and recommend the right approach. The written estimate covers the exact scope for your specific roof.
A full roof installation is planned work, not emergency work, but if your roof fails suddenly we can provide temporary protection while we schedule the full installation. Call (743) 200-8347 and a live person will help you assess the situation and arrange the next step. We answer the phone 24/7 because roof problems don’t wait for business hours.
Every installation is covered by Mercer’s 365-Day Done Right Promise: if the work is not right within a year, we make it right at no additional cost. The shingle or metal manufacturer warranty runs separately and covers the material itself, often for 25 years to lifetime depending on the product line. We’ll document both warranties and explain what each one covers before you sign anything.
Clear vehicles from the driveway, move anything fragile away from exterior walls, and cover items in the attic to protect them from dust during the tear-off. We’ll handle protecting your landscaping and cleaning up debris with magnetic sweepers for nails. We’ll send you a preparation checklist with your written estimate so nothing gets missed.
Schedule Your Roof Installation Service Today
A roof installation is a significant decision, and you deserve a company that puts everything in writing before the work begins. Call (743) 200-8347 to speak with a live person, ask any question you have, and schedule your free, no-obligation estimate. You’ll get a written price, a technician whose name and photo you know before they arrive, and a 365-day guarantee that says we’ll make it right if it isn’t.
Written by Grant Whitlock, Owner at Mercer Roofing, serving homeowners nationwide since 2000.