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CertainTeed Underlayment & Deck Repair: The Fort Lauderdale Owner’s Guide
We stock and install CertainTeed-compatible underlayment and deck repair systems throughout Fort Lauderdale, with most standard repairs running $650 – $1,850 depending on the deck area and sheet count. We carry DiamondDeck and RoofRunner on our trucks, so most jobs are finished the same day we diagnose them. The way owners usually find out this layer has failed is a leak that appears on the ceiling during a heavy summer downpour, or shingles lifting at the eaves where the deck edge has rotted and lost its grip.
Key Takeaways
- CertainTeed underlayment fails most often at fastener penetrations and roof valleys, not across the whole field
- Full deck replacement in Fort Lauderdale typically runs $2.50 – $4.00 per square foot installed, including haul-off
- We match the underlayment to your shingle system, not just whatever is on the truck
- Every repair carries the 365-Day Done Right Promise in writing
Which CertainTeed Models This Applies To
We work with CertainTeed’s two main underlayment lines: DiamondDeck, which is the synthetic high-traction option, and RoofRunner, the fiberglass-reinforced felt alternative. Both pair correctly with Landmark, Landmark Pro, Belmont, and Grand Manor shingle systems, and the underlayment spec should match your shingle warranty registration. The compatibility point that trips people up is that CertainTeed’s strengthened warranty requires a CertainTeed-branded underlayment on the entire deck. If a previous contractor substituted generic felt, your shingle warranty may not be enforceable. We check that before we touch anything.
For the deck itself, the real question is plywood versus OSB. CertainTeed’s installation specs accept both, but Fort Lauderdale’s humidity punishes OSB decking faster, especially at the eaves and around plumbing vents. When we open a roof and find OSB that has been wet more than once, we recommend replacement with CDX plywood, not a patch. The sheet dimensions are the same 4×8, but the lifespan difference in our climate is measurable in years, not months.
Styles & brands we work with
Signs Your CertainTeed Underlayment & Deck Repair Is Failing
- Ceiling stains after heavy rain. This usually means the underlayment has torn at a nail or staple and water is getting through a hole the size of a dime. The shingles above can look completely fine.
- Shingles lifting at the roof edge. When the deck edge rots, the nails lose their bite and the shingles lift. In Fort Lauderdale, we see this constantly on homes within two miles of the Intracoastal where salt air accelerates the rot.
- Spongy spots when walked on. If the deck flexes underfoot, the wood has lost structural integrity. This is a tear-off situation, not a patch job.
- Granules collecting in gutters at one specific area. Water pooling on a soft deck section causes the shingles above to wear unevenly. The granule loss points to the damaged deck underneath, not the shingle itself.
- Daylight visible from the attic. If you can see pinholes of light through the deck boards from inside the attic, water is already getting in. This is the earliest and most overlooked warning sign.
Replacement Cost & What’s Included
For a standard Fort Lauderdale ranch home, replacing the underlayment on a section of roof typically runs $650 – $1,200 installed. A full roof underlayment replacement runs $1,400 – $2,400 depending on square footage and whether we are also replacing flashing, drip edge, or deck boards. Deck repair adds $2.50 – $4.00 per square foot for the affected area, with a minimum of one full 4×8 sheet so we are not piecing scraps together.
What drives the range is deck condition, roof pitch, and how many penetrations exist. A roof with two plumbing vents and a stack is faster than one with a skylight and a chimney. You get a written line-item quote before any work starts, so you will see exactly what the materials cost and what the labor cost is. The number on the quote is the number on the invoice. If we find additional deck damage once the roof is open, we stop and send you photos before doing anything beyond the original scope. Every repair includes the 365-Day Done Right Promise: if it fails within a year, we come back and fix it at no charge.
See the difference
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After
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AfterDIY or Call Us?
What you can safely do is document the symptoms: mark the ceiling stain with painter’s tape so you can tell if it is growing, and take photos of the roof from the ground. Do not pull shingles off to look underneath. Once a shingle is loosened, the seal strip is broken and the wind resistance is compromised until it is reinstalled correctly. And do not walk a roof you do not know how to walk, especially after rain when the underlayment surface gets slick. The risk is not worth the diagnosis.
Underlayment and deck repair is not a weekend project the way sealing a small pipe boot can be. The work requires removing shingles without damaging them, inspecting the deck, replacing fasteners, and laying the underlayment to CertainTeed’s overlap and fastener schedule. If the underlayment is installed backward, upside down, or with the wrong overlap, it fails in a year or two and you will not know until the ceiling stains return. Our crew handles this every week. Call (754) 354-8628 for a free estimate, and we will have a written price to you before anything starts.
FAQs
DiamondDeck synthetic underlayment realistically lasts 15 – 20 years in our climate, while RoofRunner felt lasts 8 – 12 years. The limiting factor in Fort Lauderdale is UV exposure during the roofing process and the humidity that works on the edges. A properly installed synthetic underlayment should outlast its first shingle layer. Call (754) 354-8628 for an exact assessment of what is on your roof now.
Yes, for isolated tears and small damaged sections, but only if the surrounding deck is solid. We can cut out the damaged area and splice in new underlayment with the correct overlap. The if matters more than the repair: if the tear happened because the deck moved or rotted, patching the underlayment without fixing the deck means you will be calling us again after the next storm.
Most section repairs take 4 – 6 hours from setup to cleanup. A full underlayment replacement on an average Fort Lauderdale home takes one full day, sometimes a day and a half if deck replacement is involved. We give you a written timeline before work starts, and you will get before-and-after photos so you can see exactly what was done.
Yes. Our teams carry DiamondDeck and RoofRunner in the most common Fort Lauderdale roof sizes, so we can usually complete the repair on the first visit. For full replacements, we order exact sheet counts from our supplier the day your written quote is approved. We also work with GAF and Owens Corning systems, so if your roof is a different manufacturer, we can still match it correctly.
Ready for a Written Price?
If you suspect your CertainTeed underlayment or deck is failing, call (754) 354-8628. We will schedule a time that works for you, inspect the roof, and give you a written line-item quote before any work begins. As Dylan Pace puts it, “If it’s not in writing, it’s not a promise.” We stand behind that on every job, from a single deck sheet to a full roof replacement.
Written by Dylan Pace, Owner, Crestview Roofing Co Fort Lauderdale at Crestview Roofing Co Fort Lauderdale, serving Fort Lauderdale and nearby areas.