Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
GAF Bathroom Remodeling: The Fort Lauderdale Owner’s Guide
A GAF bathroom remodel in Fort Lauderdale typically runs $9,000 – $28,000, depending on whether you’re refreshing a guest bath or gutting a master suite down to the studs. We stock GAF-compatible waterproofing membranes, underlayments, and shower system components, and we can usually match your existing GAF product line within one site visit. Most Fort Lauderdale homeowners call us after noticing water staining on the ceiling below an upstairs bath, loose tile near the shower pan, or a musty odor that won’t go away no matter how much they run the vent fan.
GAF is best known in South Florida for roofing, but their waterproofing and underlayment products show up in bathrooms throughout Broward County. When that layer fails, it is rarely loud. It is a slow leak behind a wall, a damp spot under the vanity, grout that stays dark long after the shower dries. By the time you see it, the substrate (the moisture-resistant layer behind your tile) has usually been wet for a while.
We’re an independent Fort Lauderdale remodeling contractor. We install and work around GAF products regularly, but we’re not affiliated with GAF. That means we give you the straight answer on whether to match OEM GAF material or use a proven equivalent, without a brand agenda steering the recommendation.
Which GAF Models This Applies To
If your bathroom was built or renovated using a GAF waterproofing membrane, the product is likely from their HydroStop or EverGuard lines, both of which appear in residential shower and wet-area applications across Fort Lauderdale. These are not interchangeable. HydroStop is a fluid-applied membrane that goes on like paint and cures to a rubber-like barrier. EverGuard is a sheet membrane, rolled out and bonded at the seams. Mixing details between the two is a common failure point we see, especially at the drain collar and the wall-to-floor transition.
The compatibility gotcha nobody warns you about: GAF membranes are rated for specific thin-set tile adhesives. Use the wrong modified thin-set with the wrong GAF membrane and you get a chemical incompatibility that voids any warranty and causes tile to debond within a year. Fort Lauderdale humidity makes this worse because trapped moisture has nowhere to escape in a poorly detailed enclosure.
On the OEM versus aftermarket question: for GAF sheet membranes, we recommend matching OEM when the existing membrane is largely intact and you’re doing a repair-in-place. If we’re doing a full tear-out, we’ll price both OEM GAF material and a comparable-quality alternative like Schluter or Laticrete, and tell you which one makes sense for your specific layout and budget. Trevor Nash has torn open enough Fort Lauderdale bathrooms to know that the membrane label matters less than the installer’s detailing at the corners, curb, and drain.
If you still have the product documentation from the original build, look for the GAF product data sheet, usually a two-page PDF with a product code starting with “GF” or “HS.” Bring that to our first visit. If you don’t have it, we can identify the membrane type from a small sample taken during the estimate, which is free.
Styles & brands we work with
Signs Your GAF Bathroom Remodeling Is Failing
- Dark grout lines near the shower floor that never lighten up. Grout darkening that persists for days after the last shower means water is sitting behind the tile, not draining. The GAF membrane has likely delaminated from the substrate at the wall-floor junction.
- A water stain on the ceiling of the room below the bathroom. This is the classic late-stage signal. By the time water travels through the subfloor and shows up on drywall below, the membrane has been breached for weeks or months.
- Loose or hollow-sounding tile when you tap it with a wooden spoon handle. Tile that has debonded from the wall means the bond coat has failed, often due to the wrong thin-set over a GAF membrane. The membrane itself may still be intact, but the assembly is compromised.
- A damp, musty smell that returns within a day of cleaning. Mold and mildew living inside the wall cavity tell you water is getting somewhere it should not be. South Florida heat accelerates mold growth once moisture is present.
- Cracking silicone at the shower pan perimeter or along the curb. Caulk cracks are often dismissed as cosmetic. They are usually the first visible clue that the pan or curb is flexing, which means the waterproofing assembly underneath is moving or deteriorating.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
A GAF bathroom remodel in Fort Lauderdale lands between $9,000 and $28,000 installed. The range is wide because what is actually failing determines the job size. A membrane repair at the shower pan with new tile in the lower third of the enclosure might sit near $9,000. A full master bath gut with a new GAF waterproofing system, cement board substrate, Schluter drain assembly, tile, glass enclosure, and fixtures pushes toward the upper end.
What drives the number up or down:
- Shower size and enclosure type. A 36-inch alcove shower is a controlled, predictable job. A curbless walk-in with a linear drain and custom glass is a different project.
- What is behind the tile. If we open the wall and find rotted studs or failed drywall, that gets replaced. We write that contingency into the written price before we start, not after the walls are open.
- Fixture level. A basic Moen or Delta valve kit keeps costs down. Moving to Grohe or Kohler thermostatic valves and multiple shower heads raises the number, and we install all of these.
- Water damage under the pan. Fort Lauderdale’s high water table and humidity mean subfloor damage around the drain is common. We price the repair honestly when we see it.
Every GAF bathroom remodel from Penhallow Remodeling Fort Lauderdale includes a written price before any work starts. The number on day one is the number on the invoice. Our 365-Day Done Right Promise covers the workmanship and the installation for a full year. If something fails inside that window, we come back and fix it at no charge. That is written into the contract, not a verbal assurance.
DIY or Call Us?
You can safely handle the diagnosis on your own: check for water stains on ceilings below the bath, tap tile for hollow sounds, run your hand along the silicone at the pan perimeter to find cracks. None of that requires tools or puts you at risk.
What we would not recommend is pulling tile or cutting into a wall to reach a GAF membrane on your own. This is not about gatekeeping. It is because a failed membrane in one spot usually means water has migrated elsewhere, and a patch job over hidden damage leaves you with the same problem six weeks later. Plus, lifting tile around a shower pan without knowing where the waterproofing terminates is how a $1,500 repair becomes a $9,000 remodel.
Trevor Nash grew up in Los Angeles and learned the trade at Los Angeles Trade-Technical College before spending the better part of two decades swinging a hammer and running crews across South Florida. He has torn out enough Fort Lauderdale bathrooms to tell you honestly whether a repair is worth doing or whether full replacement is the cheaper long-term answer.
Call (754) 551-2922. Tell me what you need, I’ll tell you what it costs – then we’ll get it done.
FAQs
A properly installed GAF membrane in a residential shower should last 15 to 25 years, but the tile and grout above it typically need attention at the 10 to 15 year mark in Fort Lauderdale’s humidity unless the enclosure is well-ventilated and dried after each use. The membrane failing early is almost always an installation detailing issue, not a material defect.
Sometimes we can, when the failure is localized at a seam or drain collar and the surrounding waterproofing is intact, but in our experience most visible failures mean water has already migrated beyond the visible damage. Call (754) 551-2922 for a free estimate and we’ll tell you straight whether a repair or a full replacement is the better spend.
A shower pan membrane replacement with new tile usually takes 4 to 7 working days, and a full bathroom gut remodel typically runs 3 to 5 weeks depending on glass lead times and fixture availability. We give you a written schedule with the written price before work begins.
We stock GAF-compatible waterproofing accessories, drain assemblies, and the specific thin-sets tested for use with those membranes on our service trucks, so when we find a materials compatibility problem we can typically resolve it same-visit. We also work with KraftMaid, Cambria, and Silestone for the parts of a bathroom remodel that go beyond waterproofing, like vanities and countertops.
Ready to get a written number for your GAF bathroom remodel in Fort Lauderdale? Call (754) 551-2922 and we’ll schedule a free on-site estimate. A real person answers, day or night, and you’ll get a written price before any work starts.
Written by Trevor Nash, Owner, Penhallow Remodeling Fort Lauderdale at Penhallow Remodeling Fort Lauderdale, serving Fort Lauderdale and nearby areas.
