CertainTeed Underlayment & Deck Repair Nationwide

CertainTeed Underlayment & Deck Repair: The Fort Lauderdale Owner’s Guide

If your CertainTeed roof is leaking, lifting, or showing water stains inside, the problem usually lives in the underlayment or the plywood deck beneath the shingles, not the shingles themselves. We stock and install CertainTeed-compatible underlayment and handle full deck repair across Fort Lauderdale, with installed underlayment replacement typically running $2.50 to $5.00 per square foot and deck repair ranging from $4.50 to $8.00 per square foot depending on how much sheathing has to come up. Most homeowners discover this failure during a leak investigation: shingles look fine from the ground, but water is getting through somewhere and the underlayment has failed or the deck has rotted out beneath it.

Call (754) 354-1224

Here’s what Fort Lauderdale owners need to know before calling anyone: CertainTeed roofs are built as a system, and when the underlayment or deck fails, patching shingles over it is money thrown into the wind. This page covers exactly what fails, what it costs to fix properly, and how we handle the job so you know the price before we touch your roof.

Which CertainTeed Models This Applies To

The underlayment and deck issues we fix apply to virtually every CertainTeed shingle line installed in Broward County: Landmark, Landmark Pro, XT 25, Presidential Shake, Grand Manor, and the newer Belmont and NorthGate lines all sit on the same type of underlayment and plywood or OSB decking. The shingle brand on top doesn’t change what fails underneath, but the age of the roof does matter. Most CertainTeed roofs in Fort Lauderdale that are 12 to 18 years old have original felt or early synthetic underlayment that’s past its useful life, even if the shingles still look presentable.

If you’re trying to identify your system, check the paperwork from the original install first, then look at the roof itself. CertainTeed diamond-cut shingles like Presidential have a distinctive layered pattern you can’t miss from the curb. For underlayment identification, we look at the exposed edges in the attic or at rakes, but honestly, by the time a homeowner is asking about underlayment, the material has usually failed and its exact original spec matters less than what we’re replacing it with. On the OEM versus aftermarket question: CertainTeed manufactures its own RoofRunner and DiamondDeck underlayments, and their warranty documentation mentions them by name, but we regularly install GAF, Owens Corning, and third-party synthetic underlayments that meet or exceed CertainTeed’s spec. The decking itself is structural plywood or OSB rated for roof sheathing, and we match the thickness to code in Fort Lauderdale, which is typically 1/2-inch plywood for 24-inch rafter spacing or 5/8-inch for wider spans. One compatibility gotcha we see often: older homes near Las Olas and Victoria Park sometimes have 3/8-inch decking from the 1970s, and that doesn’t meet current Florida Building Code for re-roofing, so it has to be replaced whenever we open the roof up.

Signs Your CertainTeed Underlayment & Deck Repair Is Failing

Water tells the story. Here’s what we see before we even get on the roof:

• Water stains on ceilings or walls after heavy rain: This usually means underlayment has failed at a penetration like a pipe boot, vent, or valley. The shingles may be doing their job, but water is getting underneath and following the deck until it finds a seam.
• Shingles lifting or blowing off in storms: If shingles are coming up, the underlayment is often exposed and degrading. Once moisture hits the deck repeatedly, the wood starts to swell and fasteners lose grip, and the problem accelerates.
• Soft spots when walking the roof: We feel this underfoot immediately. Spongy decking means the wood has been wet long enough to lose structural integrity. On Fort Lauderdale homes with poor attic ventilation, this is especially common on the north-facing slopes that stay damp longer.
• Granules in the gutters plus interior moisture: Granule loss alone means shingles are aging, but combined with interior dampness, it’s a sign the water-shedding system is compromised at multiple layers.
• Attic moisture, mold smells, or daylight visible through the deck: If you can see light through your roof boards from inside the attic, the underlayment is gone and the deck itself is compromised. We’ve found this on homes throughout Fort Lauderdale that went years between inspections.

Replacement Cost & What’s Included

Here are the numbers we quote in Fort Lauderdale, in writing, before any work starts:

• Full underlayment replacement (synthetic, CertainTeed-compatible): $2.50 to $5.00 per square foot installed in Fort Lauderdale, depending on roof pitch, accessibility, and whether we’re replacing the shingles at the same time or re-using them.
• Deck repair and replacement (plywood or OSB sheathing): $4.50 to $8.00 per square foot installed, which includes removal of rotted sections, new sheathing to Florida Building Code thickness, and re-nailing to current hurricane standards.
• Combined underlayment plus deck repair: Most jobs land between $7.00 and $12.00 per square foot, but every roof is different and the written quote reflects exactly what we find when we open the roof up.

The range exists because some decks need a 4-by-8 sheet replaced, and others need the entire slope re-sheathed. What’s always included: a written line-item price before we start, a written 365-Day Done Right Promise on every repair, and a free second visit if anything isn’t right within that year. Grant Whitlock and our crew don’t change the price once the work begins; if we find more damage while the roof is open, we stop, show you photos, and get your approval in writing before moving forward.

DIY or Call Us?

An owner can safely do a few things: check the attic for daylight or water marks, look for missing or lifted shingles from the ground, and clear gutters so water flows. That’s it. Walking a roof in Fort Lauderdale to inspect underlayment is genuinely dangerous, especially on a two-story home with a 6:12 pitch or steeper, and opening up shingles to peek at the deck voids whatever warranty remains and usually creates the leak you were trying to prevent. Underlayment and deck work is not a weekend project. It requires tearing off materials in the right sequence, sealing penetrations properly, and working in heat that makes concentration hard. One mis-nailed sheet or improperly lapped underlayment seam, and you’re looking at a slow leak that ruins your ceiling over six months. If you suspect a problem, call us at (754) 354-1224 and we’ll put a qualified, background-checked technician on your roof who knows exactly what a failing CertainTeed system looks like.

FAQs

Call Mercer Roofing Co Fort Lauderdale for CertainTeed Underlayment & Deck Repair

A good roof shouldn’t be something you think about, and that means we did our job right. If you’re seeing signs of underlayment or deck failure on your CertainTeed roof in Fort Lauderdale, call (754) 354-1224 for a free estimate. You’ll get a written price before any work starts, a written 365-Day Done Right Promise on every repair, and a technician whose name and photo we send you before they arrive, badged and ready to show ID at the door. Mercer Roofing Co Fort Lauderdale is an independent service provider and is not affiliated with CertainTeed, but we know their systems inside and out. A live person answers 24/7.

Written by Grant Whitlock, Owner, Mercer Roofing Co Fort Lauderdale at Mercer Roofing Co Fort Lauderdale, serving Fort Lauderdale and nearby areas.