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GAF Windows & Doors: The Fort Lauderdale Owner’s Guide
GAF windows and doors in Fort Lauderdale typically cost $4,500 to $15,000 to replace, with most full-frame window swaps landing between $800 and $1,400 per opening. We stock the sealants, flashing kits, and hardware that GAF assemblies are known to need here, and we can usually have a technician out within a few days. The way most homeowners discover the part has failed is a soft spot underfoot near a window frame, a door that suddenly drags against the jamb after heavy rain, or a window that refuses to lock cleanly after hurricane season.
GAF sets a high bar for roofing underlayment and weather barrier systems, and their window and door components are designed to work together as a sealed assembly. In South Florida, the weak point is almost never the glass or the panel itself. It’s the flashing system, the sealant joints, or the door sweep that takes on standing water after a hard downpour in Coral Ridge or Victoria Park. We’ve pulled apart enough failed installations across Fort Lauderdale to know that the most expensive part is almost never the first thing to fail.
Which GAF Models This Applies To
GAF’s window and door line spans the Timberline series of roofing underlayments that pair with skylights, the Weather Watch and StormGuard leak barrier products that seal around wall openings, and integrated flashing systems built for residential window and door penetrations. The compatibility gotcha is this: GAF peel-and-stick flashing has a specific adhesion temperature range, and if a previous installer laid it during a cool snap without priming the substrate, the bond fails within two years. We see this on Fort Lauderdale homes built during winter dry season, when humidity is low and installers rush the flashing stage.
When you’re trying to identify the right part, the label matters. GAF prints the product name and manufacturing date code on the release film of their barrier rolls, but that film usually gets thrown away during installation. What you can still check is the exposed transition: at the sill, the head jamb, and the side flaps. Measure the window opening, the frame depth, and the jamb width. For a GAF-compatible window assembly, the right flashing kit depends on whether the opening is flanged or brick-mould style. In Fort Lauderdale’s concrete block construction, flanged windows are less common than wood-frame openings, but both exist here.
OEM GAF flashing tape and sealant runs roughly 15 to 20 percent more than quality aftermarket equivalents like Protecto Wrap or Vycor, and for most dry-service repairs the aftermarket product performs identically. The exception is a full window replacement covered by GAF’s registered roofing warranty: if the warranty is still active and the flashing was part of the original GAF roofing system, using non-GAF materials can void the coverage. We’ll tell you before you spend a dollar which situation you’re in.
Styles & brands we work with
Signs Your GAF Windows & Doors Is Failing
- Swelling or soft drywall below a window sill. Water is getting past the sealant joint and wicking into the wall cavity. In Fort Lauderdale’s humidity, a wet stud never dries on its own; it decays and feeds mold within 90 days.
- A door that scrapes the threshold only after rain. The door slab is swelling at the bottom edge because the sweep or the sill pan is no longer diverting water away from the threshold. The fix is a new sweep and a properly sloped sill pan, not planing the door.
- Condensation between the panes of an insulated window unit. The hermetic seal has failed. This is a manufacturing fatigue issue, and it’s more common on windows that bake in direct west exposure along Las Olas Boulevard or east-facing waterfront homes near Rio Vista.
- Caulking that cracks, pulls away from the frame, or turns chalky within months. This is the classic sign of a silicone-based sealant applied over a polyurethane substrate, or one applied without backer rod. GAF specifies which sealant chemistry goes with each flashing product, and mismatched materials fail fast in South Florida UV.
- Rust stains on the wall below a window corner. The metal flashing at the bottom corner of the opening is corroding, which means water has been pooling there instead of draining out and away.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
In Fort Lauderdale, the cost to replace GAF windows and doors ranges as follows:
- Full window replacement (standard vinyl or aluminum frame, GAF-compatible flashing and sealant): $800 to $1,400 per opening
- Full window replacement (impact-rated for coastal zones): $1,500 to $2,500 per opening
- Entry door replacement with GAF-compatible sill pan and weather stripping: $1,200 to $3,000 installed
- Flashing and sealant repair around existing GAF windows (no panel replacement): $400 to $1,200 per opening, depending on wall access and damage found
- Exterior door sweep and threshold rebuild: $250 to $600 per door
What drives the number up or down is wall depth, whether the home has old cedar or Florida cypress framing that needs sistering, and whether you’re in a wind-borne debris zone that requires Miami-Dade or Broward County product approval numbers. Every price we set includes the parts, the labor, the disposal, and a written quote before any work starts. If the number changes on day two, that’s on us, not on you. We hold ourselves to a fix-it-now standard: the Kingswell Guarantee, the rule we’ve worked under since 2004, says the price you sign is the price you pay.
DIY or Call Us?
Working on a GAF window or door assembly is not wiring a light fixture. This is a weather barrier, and if the seal is imperfect, water gets into your wall where you cannot see it until the damage is structural. That said, there are a few checks any homeowner can do safely. Look at the bottom edge of the door for daylight under the sweep. Run a hand along the window sill after a heavy storm and feel for dampness. Check for cracked caulk with a flashlight at the corners of each window and door frame. If any of those look off, call us at (754) 551-2922 and we’ll come take a proper look.
Where DIY goes wrong is when someone scrapes out the old sealant, squirts in a hardware store silicone, and assumes the fix is done. Without cleaning the substrate, backer rod, and the right sealant chemistry for the flashing type, you’ll be back in the same spot six months later. We’ve seen homeowners in Fort Lauderdale pay twice, sometimes three times for the same leak because the first fix was just a cosmetic bandage. The trade word here is capillary creep: water moves upward and sideways through tiny gaps, not just downhill, and a thin line of silicone does not stop it.
FAQs
In Fort Lauderdale’s coastal climate, GAF windows and doors last 20 to 30 years, but the flashing and sealant around them typically need renewing every 8 to 12 years. The panels and frames hold up; the sealant joints and sweep components give out first. Call (754) 551-2922 and we’ll tell you what’s actually at the end of its life versus what just needs cleaning and re-caulking.
A failed window seal (condensation between the panes) cannot be resealed at the job site. The insulated glass unit is factory-sealed, and the correct repair is replacing the glass unit, which costs less than a full window swap but more than a simple caulk job. If the frame is still square and the flashing is intact, you’re looking at $300 to $700 for the glass unit plus installation. Call us at (754) 551-2922 for an exact quote, and we’ll come out and measure.
A flashing repair or door sweep replacement takes 2 to 4 hours for a typical single opening. A full window replacement pulls the opening apart and takes half a day per window, including disposal and the final sealant pass. We schedule a defined arrival window and you’ll never have to chase us down for a callback. Call (754) 551-2922 and we’ll get you on the calendar.
We stock the GAF-compatible flashing tapes, sealants, door sweeps, sill pans, and hardware the Fort Lauderdale market calls for on a regular basis. If we don’t have a specific part on the truck, our supplier in Broward County can have it to us the same or next day. We also carry select parts for KraftMaid, Cambria, and Silestone installations, so if your project touches more than one system, we can likely handle it in a single trip. Call (754) 551-2922 to check on a specific part before we drive out.
Tell me what you need, I’ll tell you what it costs – then we’ll get it done. Call (754) 551-2922 for a free estimate. A real person answers, every time.
Written by Trevor Nash, Owner, Penhallow Remodeling Fort Lauderdale at Penhallow Remodeling Fort Lauderdale, serving Fort Lauderdale and nearby areas.
