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Schluter Home Additions & ADU: The Dallas Owner’s Guide
If you’re planning a Schluter-based home addition or ADU in Dallas, you’re looking at an installed project cost that typically runs between $45,000 and $130,000, depending on size, foundation work, and finish level. We install Schluter waterproofing and uncoupling systems as part of full additions and detached ADUs across Dallas, and we stock the membranes, profiles, and drains on the truck so a failing Schluter component doesn’t stall the whole build. What we see most often in Dallas homes is a Schluter KERDI membrane seam that wasn’t lapped correctly by a previous installer, or a KERDI-DRAIN that settled after the slab shifted.
The call usually starts the same way: a homeowner noticed water staining on a ceiling below a new bathroom, or a tile floor in a Dallas ADU addition has cracked along a seam line six months after the previous contractor wrapped up. The tile looked fine on the surface. The problem was underneath, at the membrane level, where Schluter’s system either wasn’t installed to spec or an off-brand substitute was used in its place. Trevor Nash has pulled up enough failed shower floors to know that when the orange membrane shows up with gaps, the fix isn’t a grout touch-up. It’s a targeted rebuild of the waterproofing layer, done right this time.
Which Schluter Models This Applies To
Schluter makes a range of products that show up in Dallas home additions and ADU projects, and the compatibility details matter more than most people realize. The main systems you’ll find in a Dallas addition are the KERDI waterproofing membrane, the DITRA uncoupling membrane, the KERDI-BOARD substrate panels, and the KERDI-DRAIN line. Each one has a specific role, and mixing the wrong profile with the wrong membrane thickness is where we see installers make expensive mistakes.
The most common compatibility gotcha we run into is KERDI-BOARD thickness. It comes in 5/16″, 3/8″, 1/2″, 5/8″, 3/4″, 1″, 1-1/2″, and 2″ panels, and the thickness you choose determines which screw washers and sealing strips you need. A 5/16″ panel with a 2″ thick KERDI-BOARD corner bench requires a transition that a lot of handymen skip. Same with DITRA: DITRA and DITRA-XL are not interchangeable with every tile size, and installing a large-format porcelain tile over the wrong membrane in a Dallas ADU means cracked tile within the first seasonal cycle. Dallas clay soil shifts. The membrane has to absorb that movement, which is exactly what DITRA does when it’s paired correctly.
We’re an independent Dallas remodeling company, not a Schluter dealer or a factory rep. That means we don’t push one membrane line over another because of a sales quota. We spec the right Schluter component for the job, and we’ll tell you when an off-brand aftermarket equivalent is genuinely fine and when it isn’t. For waterproofing membranes in wet areas, we don’t compromise. The OEM KERDI product is the standard.
Styles & brands we work with
Signs Your Schluter Home Additions & ADU Is Failing
- Water staining on the ceiling below a second-floor bathroom addition. This almost always means a KERDI seam opened up or was never properly lapped with KERDI-BAND. Water finds the gap, and it shows up as a yellow-brown ring within months.
- Loose or hollow-sounding tile in a shower or bathroom floor. When the DITRA membrane beneath tile separates from the substrate, the tile loses its bond and gives a hollow thunk when tapped. That’s the uncoupling layer telling you it’s working in reverse.
- Cracked tile running in a straight line along a floor seam. This is the classic Dallas soil-movement failure. The slab or subfloor shifted, and the wrong membrane or no membrane at all transferred the crack straight up through the tile.
- Mold or mildew smell that never goes away, even after cleaning. Water is trapped behind a failed membrane, and in a Dallas summer that moisture turns into a breeding ground. Cleaning the surface won’t fix what’s underneath.
- A KERDI-DRAIN that sits proud of the tile or leaks around the grate. This happens when the drain assembly wasn’t set at the right height for the tile thickness, or the sealing collar wasn’t bonded properly during install.
Each of these symptoms points to the same underlying reality: the waterproofing layer, not the tile, is what failed. In a Dallas climate with freeze-thaw cycles in winter and 100-degree summers, the stress on membrane seams is real. The materials are good. The installation is usually what went wrong.
See the difference
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AfterReplacement Cost & What’s Included
For a Schluter repair or re-installation tied to a Dallas home addition or ADU, the cost depends entirely on scope. A single failed shower waterproofing layer, including tear-out and rebuild, typically runs $4,500 to $12,000. A full ADU construction with Schluter systems throughout runs $90,000 to $220,000. A home addition that incorporates a bathroom or kitchen with Schluter waterproofing lands between $45,000 and $130,000, matching the price range we quoted at the start. The line-item drivers are simple: how much demo is required, what substrate replacement is needed, and which Schluter components have to be replaced versus salvaged.
Here’s how the numbers break down on a typical Dallas ADU bathroom with Schluter waterproofing:
- Demo and haul-off of failed tile and substrate: $800 to $2,000
- New cement board substrate (the moisture-resistant layer behind your tile): $600 to $1,500
- Schluter KERDI membrane and KERDI-BAND installation: $1,200 to $3,500
- Schluter KERDI-DRAIN replacement: $800 to $2,200
- Tile installation and materials: $1,000 to $2,800
Every quote we give is a written number before any work starts, so the day-one price is the invoice price. No change orders unless you ask us to add work. And if the repair fails within a year, we come back and fix it under the 365-Day Done Right Promise, in writing, at no charge.
DIY or Call Us?
There are a few things a Dallas homeowner can safely check before calling us. Look for visible gaps in the membrane where it meets the drain assembly. Check whether grout lines are cracking in a straight pattern. Tap the tile to see if it sounds hollow anywhere. Those observations help us diagnose faster when you call (940) 204-5368, and they cost you nothing but ten minutes.
What we don’t recommend is opening up a shower wall yourself. Water damage behind a failed membrane often means mold, and cutting into a wall under a Dallas ADU’s roofline means dealing with insulation, vapor barriers, and framing that may have shifted. The membrane work itself has a steep learning curve. KERDI seams require a specific overlap and a fleece-to-fleece bond that a lot of weekend installs get wrong. A bad patch job just means the leak returns, and now you’ve paid twice. If you’re uncertain, call us. The estimate is free, and we’ll tell you if it’s actually a small job or a full rebuild before we ever pick up a tool.
FAQs
A properly installed KERDI membrane should last 30 to 50 years, but the failure point in Dallas is usually the seam, not the membrane itself. Our climate demands correct overlap and bonding, and when that’s done right, the membrane will outlast the tile on top of it. Call (940) 204-5368 if you suspect a seam failure, and we’ll assess it.
Small seam failures can sometimes be patched with KERDI-BAND and KERDI-FIX, but any repair requires removing the tile in the affected area and confirming the substrate underneath is still sound. If water has been sitting for months, the substrate likely needs replacement, which means a section rebuild rather than a patch.
A typical shower waterproofing rebuild in a Dallas home takes 3 to 5 working days, including demo, substrate replacement, membrane installation, and tile reset. Larger areas like an ADU bathroom floor can add a day or two depending on curing time.
Yes, our Dallas crews carry KERDI membrane, KERDI-BAND, KERDI-DRAIN assemblies, corner pieces, and KERDI-FIX sealant on the truck, along with DITRA membrane for floors. We also stock compatible trim profiles from KraftMaid cabinetry lines, Cambria quartz sills, and Silestone countertop remnants when a job crosses from waterproofing into finish work.
When a Schluter component fails in your Dallas addition or ADU, the fix starts with a phone call. Give you a number before I pick up a tool, that’s the only way I know how to start. Call Penhallow Remodeling Dallas at (940) 204-5368 and tell us what you’re seeing. We’ll schedule a time, show up in the window we gave, and hand you a written price before any work begins.
Written by Trevor Nash, Owner, Penhallow Remodeling Dallas at Penhallow Remodeling Dallas, serving Dallas and nearby areas.
