Owens Corning Underlayment & Deck Repair Nationwide

Owens Corning Underlayment & Deck Repair: The Orlando Owner’s Guide

We stock and install Owens Corning-compatible underlayment and repair decking throughout Orlando, with most underlayment and deck repair jobs running between $800 and $2,600 installed depending on square footage, deck condition, and whether we’re doing a targeted repair or a full re-deck. Our crews carry Owens Corning Deck Defense, ProArmor, and RhinoRoof synthetic underlayment on the truck, so most jobs are completed same day once we’ve got eyes on the roof. The way Orlando homeowners usually discover this problem is not glamorous: a leak shows up on the ceiling during a July downpour, and when we pull the shingles back, the underlayment has turned brittle and the decking underneath has started to rot. By the time you see the stain inside, the part that was supposed to protect you gave up months ago.

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Here’s what Grant Whitlock wants every Orlando homeowner to understand before they spend a dollar on this fix: the underlayment is not optional, and the deck is not just plywood. It’s the roof’s last line of defense against the kind of wind-driven rain that punches sideways through Lake Nona and Conway in the summer. When it fails, the shingles on top don’t matter anymore. A roof shouldn’t be a mystery – let’s talk about what’s actually up there.

Key Takeaways

• Owens Corning underlayment and deck repair in Orlando typically runs $800 – $2,600 installed, with full re-decks on larger homes running higher.
• We stock Owens Corning Deck Defense, ProArmor, and RhinoRoof on our trucks, plus matching decking panels.
• Most underlayment failures in Central Florida are moisture-related, not age-related – our humidity and storm cycles do the damage.
• Every quote is written before work starts, and every repair carries our 365-Day Done Right Promise with a free second visit if it fails.

Which Owens Corning Models This Applies To

If your roof has Owens Corning shingles on it, the underlayment and deck underneath could be any of several products depending on when it was installed. Owens Corning pairs its Duration and Oakridge shingle lines with either felt underlayment (older installs, pre-2015 in most of Orlando) or one of their newer synthetic products: Deck Defense, ProArmor, or RhinoRoof. The synthetic stuff is a completely different animal from the old #15 felt. It’s roughly a third lighter, lays flatter, and carries a much higher tear resistance rating, but it also has specific installation requirements around fastener spacing and overlap that not every crew follows. That’s a big reason we see premature underlayment failures on Orlando homes that are only six or eight years old.

The quickest way to identify what’s under your shingles without pulling anything apart is to check your roof permit paperwork from the original install, or look for a leftover roll label in the attic above the garage. If you can’t find either, we identify it on-site once we lift a shingle course at the eave. For decking, Orlando homes mostly have either 7/16″ OSB or 15/32″ CDX plywood. Owens Corning doesn’t manufacture decking itself, but their shingle warranty assumes the deck is structurally sound and meets local Florida building code, which means if your deck is spongy or delaminated, the shingle warranty is already compromised. We install code-compliant decking that meets Owens Corning’s installation specs, so your shingle warranty stays intact.

Mercer Roofing Co Orlando is an independent service provider. We’re not affiliated with Owens Corning, but we install and repair their products every week, and we follow their installation bulletins to the letter.

Signs Your Owens Corning Underlayment & Deck Repair Is Failing

• Ceiling stains that appear days after a storm, not during it. This is the classic Orlando underlayment failure pattern. Water gets past a compromised section, pools on the deck, and takes its time soaking through. The delay is what tells us the problem is below the shingles, not the shingles themselves.
• Granules in your gutters that look like wet coffee grounds, season after season. Some granule loss is normal, but if your gutters collect a thick sludge every spring, the shingle mat is breaking down, and that fine material is working its way down to the underlayment where it accelerates wear at the seams.
• A soft spot or visible sag between rafters you can see from the attic. This means the deck itself has absorbed enough moisture to lose its structural rating. In Orlando’s humidity, a deck can rot from the underside even if the top looks fine, especially if attic ventilation was never addressed.
• Wrinkled or buckled felt visible at the roof edge or in the eaves. When underlayment absorbs moisture, it stretches. When it dries, it doesn’t shrink back. Wrinkles at the eave tell us water has been getting trapped under there, usually from a failed drip edge or gutter backflow after heavy rain.
• Attic smell that reads as damp cardboard or wet wood, especially after a dry spell. Florida attics run hot, and a wet deck bakes in that heat. The smell of wet OSB is distinctive once you’ve encountered it a few times, and it means the deck is holding moisture even if the leak hasn’t reached the ceiling yet.

Replacement Cost & What’s Included

For a typical Orlando single-family home, here’s what we quote, in writing, before any work starts:

• Targeted underlayment repair (one leak area, 50 – 100 sq ft): $400 – $800 installed, including removing and reinstalling shingles over the affected section, new underlayment lapped correctly, and resealing all penetrations.
• Partial deck repair (replacing one or two rotted panels): $250 – $500 per 4×8 panel installed, including removing and disposing of the damaged panel, sistering any compromised rafters, and reinstalling underlayment and shingles.
• Full underlayment replacement (entire roof, shingles reused where code allows): $1,500 – $3,200 depending on roof size, pitch, and whether we’re installing Deck Defense, ProArmor, or RhinoRoof.
• Full re-deck plus underlayment (entire roof, shingles replaced): Starts around $3,800 and scales with roof size. This is the honest fix when the deck has failed in multiple areas.

Every quote includes labor, materials, disposal, and our written guarantee. The price you’re quoted is the price on the invoice – no change orders, no “we found more damage once we opened it” surprises. If we do find additional damage, we show you photos from the roof and give you a revised number before we touch another board. Every repair carries the 365-Day Done Right Promise, which means if the fix fails within a year for any workmanship reason, we come back and make it right at no charge. That’s in writing on every job.

DIY or Call Us?

There are things a homeowner can safely check, and things they absolutely should not. Walking your roofline from the ground with binoculars to spot lifted shingles or wrinkled felt at the eaves is safe and useful. Going into the attic after a rain to look for damp decking or daylight at the seams is also fine. What’s not fine is pulling shingles yourself to “take a look” at the underlayment. Shingle removal breaks the seal strip, and if you don’t already know how to re-seal properly with the right adhesive in Florida heat, you’ve created a new leak where there wasn’t one. Deck replacement is structural work. Cutting out rotted panels while standing on a roof, especially a steep Orlando two-story with a tile or metal valley nearby, is dangerous for anyone without roof harnesses and training.

If you’re not sure what you’re looking at, call (850) 757-3564 and one of us will talk you through what to check from the ground. If it turns out you need us out there, the estimate is free.

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