Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
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Before
AfterFast, Reliable Roof Installation Across Tustin
A full roof installation in Tustin runs between $11,500 and $28,000 for a standard single-story home, with most projects landing around $17,000 to $22,000 depending on material and square footage. That’s the number most Tustin homeowners actually want to know before they invite anyone to walk their property. We’re Mercer Roofing, and we’ve been installing roofs for Tustin homeowners since 2000. Our crews know the difference between an Old Town bungalow and a Tustin Ranch tract home, and we’ll give you a written price before a single nail goes in. Call (743) 200-8347 and a real person answers, day or night.
Why Mercer Roofing Is Tustin’s Preferred Roof Installation Company
Tustin homeowners call us for one reason that has nothing to do with shingles. Before any of our technicians steps onto your property, you get their name, their photo, and the exact time they’ll arrive. When they show up, they’re in a clean, marked uniform and they hand you a photo ID badge at the door. That’s the Threshold Verified standard every Mercer technician is held to, and it’s the difference between us and a company that sends a stranger to your front porch.
Founded in 2000 and part of the Threshold Group family of home-service companies, Mercer Roofing works on the roofs Tustin actually has, not just the ones in a showroom. We’ve torn off failed underlayment on 1990s Tustin Ranch concrete tile, rebuilt Victorian-era roof planes in Old Town, and tied detached shop roofs into main-house drainage on acreage off Newport Avenue. Grant Whitlock, who leads our team, insists on one thing: a written price before work starts, every single time, with no exceptions and no change orders after the fact. If it’s not done right within 365 days, we come back and make it right under our written Done Right Promise. Tustin homeowners who want to know exactly who’s coming and exactly what it costs tend to stay with us.
Tile Roof in Tustin
Tile roof installation in Tustin is a different conversation than almost anywhere else in Orange County, because the city’s housing stock splits so sharply between aging concrete tile in Tustin Ranch and older clay and composition surfaces in the historic core. For Tustin Ranch homes built in the late 1980s and early 1990s, the tile itself often looks fine: unbroken, color intact, no visible damage from the street. What’s hidden underneath is the real problem. The original 30-lb felt underlayment on those roofs has been drying and cracking for three-plus decades of inland heat cycles, and once it’s gone the waterproofing layer is functionally dead. A full tile roof installation on a Tustin Ranch home that size typically runs $18,000 to $26,000, and that includes lifting or removing the existing tile, replacing the underlayment and any failed flashings, and resetting the tile with proper fasteners rated for the Santa Ana wind corridor. Tile roofs on older Old Town homes, where the original rafter framing and board sheathing need evaluation first, often land closer to $22,000 to $28,000.
Underlayment and flashing replacement
Most Tustin tile failures we see aren’t tile failures at all. They’re underlayment failures and flashing failures. The tile is a cosmetic and impact layer; the real waterproofing sits beneath it. When we install tile roofing in Tustin, we strip that old felt or aged synthetic underlayment down to the decking, inspect the sheathing, and apply a modern synthetic underlayment that won’t crack the way the old 30-lb felt did. We also replace every flashing point: pipe boots, valley metal, chimney saddles, skylight curbs, and the drip edge where wind-driven rain sneaks under the tile edge.
Re-bedding ridge and hip caps
In Tustin’s fall wind events, ridge and hip caps are the first thing to go. Forty to sixty mile-per-hour Santa Ana gusts grab the edges of unsealed caps and throw them off, leaving the ridge seam exposed. When we install or restore a tile roof in Tustin, we re-bed every ridge and hip cap in fresh mortar or mechanical fasteners rated for high-wind exposure, and we walk the entire ridge line before and after. A cap that’s loose today is a leak by January.
Roof Ventilation in Tustin
Roof ventilation in Tustin gets complicated fast on acreage properties where attic spaces run long and open, and where the Santa Ana wind corridor pushes against soffit and gable vents from the northeast. A properly ventilated roof in Tustin isn’t just about keeping the attic cool in August; it’s about moving enough air to prevent condensation on the underside of the decking during Tustin’s cool, damp winter mornings after a wind-driven rain. For a standard single-story Tustin home, a full ridge vent installation with balanced intake runs $1,400 to $3,200 as part of a roof installation, and less when added to an existing roof that doesn’t need a full tear-off. On large open-lot homes with oversized attics or vaulted ceilings, we often combine continuous ridge venting with additional eave intake and sometimes powered attic fans, which can push the ventilation scope to $4,500 or more.
Ridge and soffit balance
We see a lot of Tustin roofs where the builder installed ridge vents but undersized the intake, or vice versa. A vent system only works when air moves: intake at the eaves, exhaust at the ridge, and enough of both to keep the attic at a stable temperature. On our Tustin installations, we calculate the net free area in and out before we cut the first hole, because a half-ventilated attic is often worse than no ventilation at all. The same wind that lifts tile edges also pressurizes certain attic spaces, and unbalanced ventilation makes that pressure differential worse.
Open-lot attic heat and wind
Homes on acreage in east Tustin, off Newport Avenue and into the unincorporated county pockets, often sit more exposed than tract homes. No neighboring rooflines to break the wind, no shared walls to slow the heat gain. On those roofs, we size ventilation for the full exposure, not the square footage alone. More wind exposure means more wind-driven moisture entry points, and more heat exposure means faster shingle and underlayment degradation without proper airflow. A continuous ridge vent that runs the full ridge line, matched with soffit intake that stays clear of leaf litter and dust, is the minimum standard we recommend on open lots.
Trusted Brands We Service in Tustin
Mercer Roofing installs and repairs roofs using manufacturer-recognized shingle brands including GAF, CertainTeed, Owens Corning, IKO, Atlas, and Tamko. For Tustin homeowners, that matters when it comes to warranty coverage: a manufacturer’s material warranty is only as good as the installer’s workmanship and certification, and we install to spec every time. We stock the components Tustin roofs need most, ridge cap, underlayment, flashing, and fasteners, so we’re not waiting on a parts run when your project is already underway. If you’re weighing GAF against CertainTeed or Atlas, we’ll give you a straight answer on cost and performance for your specific roof shape and exposure, not a brand pitch.
Common Roof Installation Problems We See in Tustin Homes
- Hidden underlayment decay in Tustin Ranch tile roofs. The tile looks fine from the ground, but 30-year-old felt underneath has turned to dust. By the time you see a ceiling stain, the decking is often already wet and soft.
- Wind-lifted starter strips and drip edge on open lots. Santa Ana winds get under the starter course and peel it back, especially on east-facing roofs off Newport Avenue. The damage starts small and leaks months later when winter rain arrives.
- Pooled runoff against fascia on ungraded acreage. On lots without a tract’s shared drainage, roof water from the house and outbuildings discharges straight onto open ground. We’ve pulled off fascia boards that looked intact from the outside and found the back side rotted through from splash back.
- Undersized decking and missing ice and water shield on older detached structures. Detached shops and ADUs, especially on county-permitted parcels, often went up without a full decking scope. Flashing points and penetrations leak first, and the fix usually means tearing off down to the framing to do it right.
Pricing for Roof Installation in Tustin, CA
A full architectural shingle re-roof on a standard single-story Tustin home runs $11,500 to $18,000, with tear-off and basic decking included. Tile roof installations start around $18,000 and go to $28,000 or more when the underlayment is fully replaced and the ridge caps are re-bedded. The variables that move the price in Tustin are square footage, the number of roof planes and penetrations, whether we’re tying in a detached shop or ADU, and site access: if the staging area is tight or the haul is long, that adds labor. We give you a written line-by-line price before any work starts, and that number doesn’t change unless you ask us to add scope. To get an exact quote for your Tustin roof, call (743) 200-8347 and we’ll set a time for a free estimate.
We Also Serve Cities Near Tustin
Mercer Roofing handles Roof Installation across central Orange County, including Santa Ana, Orange, Irvine, and Villa Park. If you’re on the Tustin side of those city lines, the same written-price guarantee and the same Threshold Verified crew standard apply. For a closer look at what we do in Tustin specifically, visit our Roof Installation in Tustin page or call the number below.
Serving Tustin, CA - Our Local Coverage Area
We’re based in the Tustin 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 Tustin
It depends on where your property sits. Homes inside Tustin city limits pull a building permit through the city of Tustin. But acreage properties in the unincorporated county pockets, like the lots off Newport Avenue east of the 55, go through Orange County planning and building permits instead. The scope often changes too: county-permitted parcels frequently include detached shops, outbuildings, or ADUs that need to be evaluated separately, and county inspectors look at grading and drainage differently than city inspectors do. We handle the permit paperwork for whichever jurisdiction applies, and we don’t start work until the permit is signed off. Call (743) 200-8347 and we’ll confirm which process applies to your property.
We plan the job around your clearances. On a Tustin acreage lot with a well and septic system, the roof installation itself doesn’t touch either one, but the staging and access do. We locate the well and septic lines before we set up, and we keep material staging and debris containment outside the required setback distances. The bigger issue is usually drainage: roof runoff from the house and any detached buildings has to discharge without pooling over a septic field or saturating a wellhead. If the existing drainage is inadequate, we address the grading or add drainage swales as part of the scope, so the new roof isn’t sending water somewhere it shouldn’t. Call (743) 200-8347 for a free evaluation of your specific lot.
Because a roof is only as good as the ground it drains onto. On Tustin’s open acreage lots, pooled water against the fascia and soffit rots the roof’s edge from the bottom up, often years before the shingles or tile above show any wear. When we install a roof on an open lot, we walk the drainage first: where does water fall, where does it sit, and where is it supposed to go. If the swale is flat or the ground grades toward the foundation, we fix that before we set the first square. A new roof on bad drainage is a half-finished job, and we’d rather tell you that before you spend the money than watch the fascia rot again in three years. Call (743) 200-8347 to have us look at your lot’s drainage as part of your estimate.
Yes, and we usually recommend doing them together. Detached structures on Tustin acreage properties, especially those on county-permitted lots, are often roofed with less attention to decking, underlayment, and flashing than the main house. Combining the projects lets us stage materials once, coordinate the permit scope in a single application, and catch any shared drainage issues between the two structures before they leak. The price depends on the outbuilding’s square footage and condition, but a simple detached shop roof in Tustin typically adds $6,000 to $12,000 to the main-house installation. Call (743) 200-8347 and we’ll give you one written price for both.
We size ventilation for wind exposure, not just attic square footage. Homes in east Tustin and the unincorporated county pockets sit fully exposed to the Santa Ana wind corridor, which pressurizes attic spaces and drives more wind-blown moisture into the roof assembly. On those homes we run a continuous ridge vent the full length of the ridge, then balance it with soffit intake that’s been measured, not guessed. In some cases we add powered attic fans to move air through long, low attic spaces that passive venting can’t handle. The goal is stable attic temperature and dry decking year-round, because in Tustin’s wind corridor a poorly ventilated attic rots faster than almost any other roof component. For an exact ventilation scope on your open-lot home, call (743) 200-8347.
On a half-acre lot off Newport Avenue in east Tustin, we replaced the roof on a detached shop and the main house with CertainTeed architectural shingles, tearing off two layers to inspect the decking, then adding ice and water shield in the valleys and a continuous ridge vent because the long haul and tight gate meant staging material in one pass. The original roof had failed at the penetrations and drip edge after the Santa Ana winds lifted the old starter strip, and the open-lot grading had pooled water against the fascia, so we corrected the drainage swale before we set the first square. That’s the difference between a crew that knows Tustin acreage and one that’s just shingling the same shape as every other job.
If you’re in Tustin and you want a roof installed by people who put the price in writing first, know who’s coming to your door, and understand what wind and open ground do to a roof, call Mercer Roofing at (743) 200-8347. We’ll give you a free estimate with a written line-item price, and we won’t start until you’ve read it and signed it. Our Roof Installation team serves Tustin from the county pockets off Newport Avenue to the planned communities of Tustin Ranch, and every visit starts the same way: a name, a photo, and a badge at the door.
Written by Grant Whitlock, Owner of Mercer Roofing, serving Tustin and central Orange County since 2000.