IKO Underlayment & Deck Repair Nationwide

IKO Underlayment & Deck Repair: The Houston Owner’s Guide

We stock and install IKO-compatible underlayment and decking, and most Houston repairs run $450 – $1,200 installed depending on how many deck sheets and how much underlayment has to come up. We carry the material on our trucks, so most jobs are done in a single visit. The way owners usually find us: a leak shows up on the ceiling after a hard rain, or a roofer doing a shingle patch lifts a corner and finds the decking underneath has turned to wet cardboard. What’s underneath the shingles matters as much as the shingles themselves, and in Houston’s climate, that’s where roofs quietly fail first.

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Key Takeaways

• IKO underlayment and deck repair in Houston typically runs $450 – $1,200 installed, depending on square footage and deck damage.
• We’re an independent Houston roofing contractor; we install IKO-compatible underlayment and decking but we’re not affiliated with IKO.
• Houston’s humidity and storm cycles mean underlayment and decking fail years before the shingles look bad.
• Every repair includes a written price before work starts and a written guarantee on the work itself.

Which IKO Models This Applies To

IKO puts its name on a full lineup of asphalt shingles, from the Cambridge architectural series to the Nordic performance line and the Dynasty and Crowne Slate premium tiers. The good news: the underlayment and decking underneath don’t change by model. Whether we’re working under an older IKO Marathon install or a newer Cambridge system, the deck repair and underlayment approach is the same because the substrate requirements are the same. The decking is the plywood or OSB sheets nailed to your rafters, and the underlayment is the water-shedding barrier stapled and nailed on top of that, directly beneath the shingles.

What does change is what we find when we open the roof. Older IKO installs in Houston, especially anything from the early 2000s, were often put down over felt paper that’s now brittle or torn at the seams. Newer IKO systems typically call for a synthetic underlayment rated for high-temp exposure, because Houston sun bakes a roof deck to temperatures that turn cheap felt into tissue paper. When we replace decking, we use exterior-grade plywood or OSB matched to the existing thickness, usually 15/32-inch or thicker for 24-inch rafter spacing. IKO’s own installation guides call for a clean, dry, smooth deck surface before underlayment goes down. We follow that, because skipping deck prep is the fastest way to void a shingle warranty and guarantee a callback.

We also stock parts for GAF, Owens Corning, and CertainTeed systems, along with IKO, so if you’re not sure what you have, we’ll identify it on site and price accordingly.

Signs Your IKO Underlayment & Deck Repair Is Failing

• Water stains on ceilings or walls after rain. By the time water shows up inside, it has already passed through the shingles, the underlayment, and the deck. The leak you see is the last stop, not the first.
• Spongy or bouncy spots when walking the roof. Decking that has absorbed moisture loses its structural stiffness. A soft spot underfoot means the wood or OSB is compromised and needs to be cut out and replaced, not just covered over.
• Granules collecting in gutters in one concentrated area. If shingles are granulating unevenly, the underlayment below may already be exposed to sun and rain, which accelerates the whole system’s failure.
• Visible daylight from the attic. If you can see light through the roof boards from inside the attic, that’s not a small gap. That’s a channel for water, and the underlayment has already failed at that point.
• Mold or mildew smell in the attic after humid stretches. Houston’s humidity means trapped moisture under the deck doesn’t dry out on its own. A musty attic during an August heat wave is often the first hint that the deck has been holding water for months.

One thing we’ve learned from years of Houston roofs: the shingles can look perfectly fine while the deck underneath is failing. Shingles shed water. Underlayment and decking are the second and third lines of defense, and in a city that gets 50-plus inches of rain a year, those lines get tested constantly.

Replacement Cost & What’s Included

What you’ll actually pay in Houston depends on two things: how many square feet of decking has to be replaced and whether the entire roof needs new underlayment or just a section. Here’s the line-item breakdown we give every homeowner before anything is torn open:

• Decking replacement (plywood or OSB): $2.50 – $4.00 per square foot installed, including removal of the failed sheets.
• Synthetic underlayment (IKO-compatible): $0.45 – $0.75 per square foot installed over new or existing deck.
• Small section repair (one leak, 20 – 50 sq ft): $450 – $700 total.
• Larger deck section (100 – 300 sq ft with new underlayment): $800 – $1,200 total.
• Full deck replacement (entire roof): $3,500 – $6,000, usually folded into a full re-roof quote.

Every one of those numbers includes labor, fasteners, and cleanup. If we open the roof and find more damage than the estimate accounted for, we stop, show you what we found, and put the revised number in writing before any additional work happens. Greg Holloway, the owner, walks every job himself and writes up the price before a single shingle moves. That’s just how we work.

DIY or Call Us?

You can safely check a few things yourself: look for water stains in the attic, check for granules in the gutters, and note any spots where the roof surface looks uneven from the ground. That’s useful information to have when you call us, and it helps us give you a more accurate picture over the phone.

Opening up your roof is where we’d draw the line. Cutting out decking means exposing the attic and whatever’s below it to the elements, and if you misjudge the rafter spacing or the deck’s load path, you’re creating a bigger problem than the one you’re solving. Deck repair also means working at height with hand tools and hauling sheet goods up a ladder, which is not the weekend project it looks like from the driveway. We’d rather you spend your Saturday doing something else and let our crew handle the roof. You’ll know the price before we touch the roof. Call (254) 566-3573 and we’ll get you on the schedule.

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