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Schluter Home Additions & ADU: The Dallas Owner’s Guide
Schluter home additions and ADU projects in Dallas typically run $45,000 to $130,000 installed, depending on square footage, foundation work, and the Schluter waterproofing systems specified for wet areas. Most homeowners reach out to us after discovering a failed waterproofing membrane or cracked transition strip during a remodel inspection, or when they’ve realized their existing addition was never properly flashed where tile meets drywall.
We stock Schluter-compatible components for additions and ADU builds across Dallas, from KERDI membrane rolls to DITRA uncoupling mats, and we install them to spec. If you’re mid-project and a membrane failed or a transition strip pulled loose, that’s the call we handle most often. You should know who is coming, what it costs, and what happens if something goes wrong, before we ever pick up a tool.
Which Schluter Models This Applies To
Schluter’s product line splits into two families for additions and ADU work: KERDI (sheet waterproofing membrane) and DITRA (uncoupling and waterproofing underlayment for tile). Within those, you’ll see names like KERDI-BOARD, KERDI-BAND, DITRA-HEAT, and the SCHLUTER-TRENDLINE profiles that finish tile edges. The compatibility gotcha most Dallas homeowners miss: KERDI-BAND requires a minimum 2-inch overlap on every seam to hold its waterproof rating, and that overlap eats into your tile layout if you don’t plan for it before the first membrane sheet goes up.
When you call us, we’ll ask for the product name printed on the roll or box, plus the width measurement. A 5-meter roll of KERDI membrane is 39-1/4 inches wide, while DITRA uncoupling mat runs 39-3/8 inches wide and roughly 1/8-inch thick. That eighth-inch matters when you’re setting a threshold or door clearance. For OEM versus aftermarket: Schluter’s warranty only applies when the full system (membrane, band, corners, drain) is installed together. An aftermarket corner piece from a supply house voids that coverage. We install OEM Schluter parts because the written guarantee on our work is only as good as what we’re standing behind.
Styles & brands we work with
Signs Your Schluter Home Additions & ADU Is Failing
- Efflorescence blooming on tile grout near the shower or wet bar. This white chalky residue means water is moving behind the tile, not being directed into the drain. In a Dallas addition, that moisture usually finds the seam where the wall membrane meets the floor membrane, often because the spec overlap was skipped or the thinset bed was too thin.
- Grout cracking at the transition between the addition and the original slab. North Texas clay soil moves more than most homeowners expect, and a rigid tile assembly over a moving slab crack will telegraph through the grout. DITRA’s uncoupling layer is designed specifically to isolate that movement, which is why it matters which underlayment was used and whether the install followed Schluter’s fastener schedule.
- Water staining or a musty smell in the ADU bathroom or kitchenette. By the time you smell it, the leak has been active for weeks. The first suspect is a torn KERDI corner or a nail penetrating the membrane from the other side of the wall, common in additions where drywallers followed the tile crew by a few days.
- Loose or lifting tile near the edge of a shower bench or curb. The Schluter trim strip that seals that edge is only functional if fully embedded in thinset and lapped by membrane. If it’s cracked or pulling away, water has a direct path into the wall cavity.
- The addition feels warmer than the rest of the house and the tile floor flexes underfoot. A tile assembly with a void underneath will flex. In an ADU with DITRA-HEAT installed, the heating cable can overheat in air pockets, shortening its life. That’s a wiring and waterproofing failure, not a tile failure.
See the difference
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AfterReplacement Cost & What’s Included
For a Schluter-specific repair inside an existing Dallas addition or ADU, you’re usually looking at $800 to $4,500 depending on how much tile must come up to expose the failed membrane or trim. A full waterproofing retrofit on a new ADU bathroom falls within the broader $45,000 to $130,000 project range, since the Schluter work is one line item within the framing, electrical, and finish schedule.
What drives the cost: whether the failure is a single seam or a systemic install flaw, how much demo is required to reach the membrane, and whether the subfloor needs correction before new underlayment goes down. Every quote we write in Dallas is a written price before work starts. No verbal estimate that grows later. That includes the Schluter parts, thinset, labor, and the 365-Day Done Right Promise: if it’s not right within a year, we make it right at no cost to you.
DIY or Call Us?
If you have a torn piece of KERDI-BAND visible at a seam edge and you’re still in the rough-in phase, that’s a patchable repair with the right thinset and a 2-inch overlap. What you should not do is attempt a membrane repair behind installed tile, or mix waterproofing products from different manufacturers. A vinyl patch from a big-box store is not a Schluter seam, and it will not hold the waterproof rating your addition’s wall cavity depends on. Once tile is set, the only honest repair is demo back to the failure, which is where we come in.
Call (432) 302-8761 and we’ll send a technician who has already been introduced to you by name and photo before the visit. You’ll see their ID badge at the door. No guesswork about who’s walking into your home.
FAQs
A properly installed Schluter KERDI membrane will outlast the tile above it, often 30 years or more, because the membrane itself doesn’t degrade. What fails in Dallas is the installation: clay soil movement, insufficient thinset coverage, or a skipped overlap at a seam. In our experience, failures show up in the first 3 to 5 years if the install was rushed. If your membrane has made it ten years, it was installed correctly and will likely stay watertight. Call (432) 302-8761 for an inspection if you suspect a seam issue, estimates are free.
Yes, a torn KERDI membrane can be patched with another piece of KERDI or KERDI-BAND as long as you maintain the 2-inch minimum overlap on all sides of the tear, and that the repair is done before tile goes over it. Once tile is already set, a repair means removing tile back to sound membrane, cleaning the surface, and re-patching, which is more involved but still far cheaper than a full gut. We stock KERDI-BAND rolls on our trucks for exactly this repair. Call (432) 302-8761 and we’ll tell you honestly whether you need a patch or a re-do.
A simple KERDI-BAND patch in an accessible seam takes one day including thinset cure time before flood testing, which itself takes 24 hours for a shower pan membrane. If tile demo is required to expose the failure, plan for two to three days total. We’ll give you a written schedule before starting. Call (432) 302-8761 for a timeline on your specific repair.
We stock the Schluter parts used on most Dallas addition and ADU jobs: KERDI membrane rolls, KERDI-BAND, DITRA uncoupling mat, inside and outside corners, and kerdi-fix sealant. Uncommon profiles or DITRA-HEAT components may require a one-to-two-day supplier run. We also stock parts for KraftMaid, Cambria, and Silestone finishes if your renovation touches more than the waterproofing layer. Call (432) 302-8761 and we’ll check the truck before we arrive.
Written by Isaac Pruett, Owner, Mason Remodeling Co Dallas at Mason Remodeling Co Dallas, serving Dallas and nearby areas.
