IKO Underlayment & Deck Repair Nationwide

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

We stock and install IKO-compatible underlayment and decking repair materials across Houston, with most underlayment swaps and deck section replacements running between $450 and $1,800 installed depending on how much deck has to come up and which IKO product line your roof was built with. Most jobs are done in a single day once we’ve got eyes on the roof. Most homeowners discover the problem the same way: a water stain on the ceiling, a shingle that shifted in a Gulf Coast storm, or a roofer who pointed a camera at the plywood and said, “This is bad.”

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Here’s what’s actually happening under your shingles. The deck is the plywood or OSB layer nailed to your rafters. The underlayment is the barrier that sits on top of that deck, under your shingles. When either one goes, water doesn’t just hit the surface and run off. It gets into places that rot fast in Houston humidity. Once that deck starts to delaminate, your shingles have nothing solid to nail into. That’s when repairs get expensive fast.

The first thing to understand: A roof either keeps water out or it doesn’t, everything else is details. And in Houston, where we get 50-plus inches of rain a year and three or four months of near-saturation humidity, the underlayment and deck are what determine whether your shingles can do their job. It’s not a place to cut corners.

Key Takeaways

• IKO underlayment failure in Houston almost always starts at the roof penetrations: vents, pipes, valleys, and eaves where water pools.
• Deck repair cost depends on how much sheathing has to be replaced, not how big the visible problem looks from the ground.
• We install genuine IKO underlayment where it’s specified, and we also stock compatible alternatives from GAF, Owens Corning, and CertainTeed so you have options with written pricing.
• Every underlayment and deck repair from Brennan Roofing Co Houston is backed by the 365-Day Done Right Promise: in writing, for one full year, and we come back free if it fails.

Which IKO Models This Applies To

IKO makes several underlayment lines, and the right replacement depends on which was originally installed. The common IKO underlayments we see across Houston roofs are IKO StormShield (a self-adhering ice and water protector), IKO ShieldPro (a synthetic underlayment), and IKO ArmourGard (a standard felt asphalt underlayment). Each has different fastening requirements and different exposure limits. We also see a lot of roofs built with IKO Cambridge or IKO Dynasty shingles, which were often paired with one of those underlayments at install.

Here’s the compatibility gotcha that trips up homeowners: IKO StormShield is a self-adhered membrane that must be applied to clean, dry decking, and it will not bond correctly over damp or weathered plywood. If your deck has absorbed moisture from a failed underlayment, the new membrane may look fine on install day and start to lift within a season. We see this all the time after someone patches a section without checking the deck’s moisture content below. A roof that’s been leaking for a while means the deck underneath that StormShield is already compromised, and the new membrane will fail unless the wet sheathing comes out first.

OEM versus aftermarket matters with IKO, more than with some brands. IKO warranties on the shingle system generally require IKO underlayment when the roof was registered as an IKO system. If you’re outside the warranty window, a high-quality synthetic from GAF, Owens Corning, or CertainTeed is functionally equivalent and often costs less. We’ll tell you which makes sense for your roof, in plain English, with the price on paper before any work starts. We’re an independent Houston roofing company, not an IKO dealer, so there’s no pressure to push one brand over another. We install whatever fits the roof and the warranty situation best.

Signs Your IKO Underlayment & Deck Repair Is Failing

• Ceiling stains that darken after heavy rain. This usually means water is getting past both the shingles and the underlayment, and it’s now sitting on the deck. By the time the stain is visible inside, the deck in that area has likely been wet for weeks or months, not days.
• Spongy spots on the roof when walked. Delaminated or rotten decking loses its rigidity. If a section of your roof feels soft underfoot, the deck has already failed structurally and needs to be cut out and replaced before new underlayment can go down.
• Shingles lifting, curling, or blowing off in one concentrated area. Shingles fail to hold when the deck below won’t accept nails anymore. This is especially common on Houston roofs where attic ventilation has been poor and the deck has been baking from both sides.
• Granules in the gutters or bare spots in shingle fields. Granule loss is a shingle issue, but the reason it matters for underlayment and deck is that the shingle is no longer protecting what’s underneath. Once the shingle wears away, the underlayment becomes the only line of defense, and most underlayments were never designed to handle direct sun exposure for long.
• Visible drips in the attic after rain, especially near pipe collars and valleys. If you can see water moving in the attic, you’re looking at a failure point that has already breached the deck. The fix is not a patch. It’s cutting out the affected sheathing, checking for framing damage, and installing new decking plus new underlayment before re-shingling.

Replacement Cost & What’s Included

Here’s what IKO underlayment and deck repair costs in Houston right now, based on our recent work from Meyerland to Spring Branch to Pearland:

What drives the range: deck condition, roof pitch, number of layers on the existing roof, and how much demolition debris has to be removed. Steep pitches cost more because we’re working on safety lines the whole time. Two-layer tear-offs cost more because there’s more material to haul.

Every quote from us includes the parts, the labor, the disposal, and the written price on paper before work begins. You’ll see the exact underlayment product we’re installing and the exact deck material we’re using. If the crew finds hidden rot once the shingles come up, we stop work, show you what we found, and put the additional scope in writing before we touch it. No change orders at the door. That’s the Garrison Standard.

Every repair is covered for a full year under our 365-Day Done Right Promise. If it fails, we come back. No charge. We put that in writing on every job.

DIY or Call Us?

There are two things an owner can safely check without getting on the roof. First, look in the attic during daylight with the lights off. If you see light pinholes through the deck, that’s a deck problem. Second, look at the attic insulation for water trails and dark staining. These will tell you roughly where the leak is.

What you shouldn’t do is peel back shingles and patch underlayment yourself, especially on a Houston roof in summer. Deck repair means walking on a surface that may be partially rotten. Rotten decking gives way. A fall through a roof deck is a serious injury, and it happens faster than people expect. There’s also the heat: deck surface temperatures in Houston in July and August run well over 140 degrees. Working on a roof in that heat, on a softened surface, with no safety equipment, is a recipe for a hospital visit. This is one of those jobs where the risk of doing it wrong or getting hurt is not worth the money saved.

If you’re unsure what you’re looking at, call us at (940) 461-8481. A live person answers, around the clock, no voicemail and no automated menu. We’ll walk through what you’re seeing and tell you honestly whether it justifies a service visit.

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