GAF Bathroom Remodeling Nationwide

GAF Bathroom Remodeling: The Houston Owner’s Guide

We install GAF roofing and waterproofing products as part of complete bathroom remodels across Houston, and a full GAF-integrated bathroom project typically runs $9,000 to $28,000 depending on scope, flooring, and the condition of the subfloor and framing below. Most Houston homeowners discover they need GAF-specific work not when the membrane itself fails, but when they notice water staining on the ceiling below a second-floor bath, peeling baseboards at the shower curb, or persistent mildew smells that no amount of scrubbing resolves. The written price comes before any work starts, and the crew puts down drop cloths and shoe covers before the first cut is made.

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Which GAF Models This Applies To

In bathroom work, the GAF products that matter are the waterproofing membranes and underlayments that sit beneath tile and behind shower walls: GAF EverGuard, GAF HydroStop, and the GAF StormGuard and WeatherWatch lines used as secondary moisture barriers. Each has different thicknesses, roll widths, and adhesion requirements, and a product that works on a flat roof over a Houston carport will not necessarily be the right spec for a steam shower enclosure or a second-floor bath sitting above a finished living space. The easiest way to identify what you have is to check the product label on the roll or bucket from the original install, or look at the permit paperwork if the previous owner filed it. If the label is gone, we measure substrate condition and slope, then match to the correct GAF system for that application. One gotcha we see often in Meyerland and Bellaire: a previous contractor used a GAF roof membrane as a shower pan liner, which is not what that product is rated for, and the fix requires a full curb rebuild. In most cases we recommend genuine GAF materials because the manufacturer warranty tracks with the product, but there are quality aftermarket membranes we use when a specific GAF spec does not match the Houston climate and the exact substrate.

Signs Your GAF Bathroom Remodeling Is Failing

• Water staining on the ceiling below the bathroom. This usually means the waterproofing layer under the tile has been compromised at a seam or corner, and water is traveling along the joists before it shows up as a stain. By the time you see the stain, the leak has been active for weeks or months.
• Grout lines that stay dark or damp after 24 hours. Grout is not waterproof. When the membrane below has failed, moisture wicks through the grout constantly, and you’ll notice the same lines look wet long after the shower was used.
• A persistent musty smell that cleaning does not remove. That odor is organic material growing in the cavity between the tile and the studs. The only fix is opening the wall, removing affected material, and reinstalling with a proper GAF or equivalent waterproofing system.
• Peeling paint or bubbling baseboards near the shower curb. Water is wicking under the floor tile and into the drywall at the bottom plates of the walls. This is a sign the pan or the curb waterproofing has failed, not just the paint.
• Loose or hollow-sounding tiles near the drain or at the shower floor. This means the mortar bed beneath is breaking down from constant moisture exposure. Once tiles move, the membrane is likely torn or has never been installed correctly at the drain flange.

Replacement Cost & What’s Included

For a GAF-integrated bathroom remodel in Houston, the installed range is $9,000 to $28,000, with smaller bathrooms and straightforward membrane replacement at the low end, and full tear-outs with new framing, custom tile work, and multiple waterproofing layers at the high end. What drives the range: square footage, whether we remove and replace the subfloor, the condition of the floor joists, whether the shower pan needs to be rebuilt from the drain up, and whether we are matching existing tile or selecting new from our partner lines like KraftMaid for cabinetry or Cambria and Silestone for surfaces. Every project includes a written line-item price before work starts, so you know the membrane cost, the labor, the tile, the fixtures, and the clean-up separately. We include drop cloths, shoe covers, quiet tools during family rest hours, and a photo of the clean-up before the crew leaves. The work carries our 365-Day Done Right Promise: if it is not done right, we make it right.

DIY or Call Us?

You can safely check a few things yourself: look for the GAF product label on any leftover materials from the original build, note where water staining appears and how long it has been there, and check whether the tile grout stays damp after a full day of non-use. What you should not do is open the shower pan or remove tiles to “see how bad it is.” Water damage that reaches the membrane means the structure beneath is already compromised, and pulling back layers without containing the moisture can spread mold spores through the house and destabilize the tile bed further. If the failure involves the shower pan, the drain, or any area where water has reached the subfloor, call us at (254) 272-5240 and we will come assess it properly. The assessment takes less time than most people expect, and the written scope comes with it.