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Schluter Home Additions & ADU: The Jacksonville Owner’s Guide
If you’re planning a home addition or ADU in Jacksonville and want Schluter waterproofing and uncoupling systems specified throughout the wet areas, we install Schluter products as part of our full addition builds, with total project costs typically running $45,000 to $130,000 for an addition and $90,000 to $220,000 for a detached ADU. The Schluter components (KERDI board, DITRA underlayment, KERDI-BAND, and related trims) are a named line item in the written price you receive before any work starts. Most owners find us when they’re checking whether a contractor will actually use the Schluter system they’ve researched, rather than a generic substitute that gets swapped in after the contract is signed.
The failure picture on this page is a little different from a single broken part. With Schluter in an addition or ADU, you’re usually looking at either a failed waterproofing detail that was never Schluter to begin with, or a correctly specified Schluter system that someone installed without following the thin-set coverage and banding sequence. Either way, the fix is the same: open the wall or floor, correct the detail, and re-tile with the system done properly.
Key Takeaways:
- We write Schluter products into the scope by name, so the estimate says KERDI-BOARD, not “waterproof backer board.”
- Additions in Jacksonville run $45,000 to $130,000; ADUs run $90,000 to $220,000 as full builds.
- DITRA and KERDI failures in Florida are almost always installation errors, not product defects – and they’re correctable without a full rebuild if caught early.
- Every project gets a written price before work starts and the 365-Day Done Right Promise after it’s finished.
Which Schluter Models This Applies To
Schluter’s system is modular, not model-based, so compatibility is about matching the right component to the application rather than finding a “part number for your unit.” The core pieces in a home addition or ADU are KERDI-BOARD for shower walls and tub surrounds, DITRA or DITRA-HEAT for floor underlayment, KERDI-BAND for seams and corners, KERDI-DRAIN or the linear KERDI-LINE for shower bases, and profiles like SCHIENE or RONDEC for edge finishing. The compatibility gotcha Jacksonville owners run into: DITRA requires a specific thin-set layer beneath it (modified to bond to the subfloor) and an unmodified thin-set on top to set the tile. Skip the unmodified layer on top and the tile can shear loose within a season, especially in a humid Florida crawlspace or slab-on-grade addition.
We specify genuine Schluter components on every wet-area build. There are aftermarket uncoupling mats and foam boards on the market, and some cost less per square foot. We won’t use them for one reason: the Schluter warranty only applies when the entire assembly is Schluter, including the banding and the drain. A mixed system voids the manufacturer’s coverage, and saving $2 per square foot on a $90,000 ADU is a poor trade. Elmstead Remodeling Jacksonville is an independent contractor and not affiliated with Schluter Systems, but we install their products to their published specs because the warranty matters to families living with the result.
Styles & brands we work with
Signs Your Schluter Home Additions & ADU Is Failing
- Grout lines darkening at the shower floor perimeter. Water is wicking under the tile because KERDI-BAND wasn’t overlapped the required 2 inches at the wall-to-floor transition. The Schluter membrane itself is fine; the seam is not.
- Tile hollow-sounding when tapped. This usually means the thin-set was skimmed on instead of combed to full coverage, or it skinned over before the tile was set. In Jacksonville humidity, thin-set open times shrink fast, and a crew that doesn’t adjust for that leaves voids behind.
- Musty odor from the shower that cleaning doesn’t fix. Water has gotten behind the tile and into the foam board or stud cavity. With a proper Schluter assembly, the waterproof layer is directly behind the tile, so this should never happen.
- Cracked tile in the middle of the floor, not along a seam. The subfloor deflected more than the allowable span for DITRA, or the joists weren’t stiffened before the addition was tiled over. DITRA handles lateral movement, but it can’t fix a floor that bounces.
- Efflorescence or white crust at the bottom row of tile. Water is evaporating through the grout and leaving mineral deposits behind, which points to a failed or missing KERDI-BAND lap at the base of the wall.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For a full home addition in Jacksonville with Schluter waterproofing in the bathroom or kitchen, the project range is $45,000 to $130,000 depending on square footage, foundation type, and finish level. A detached ADU with a Schluter-specified bathroom runs $90,000 to $220,000. Those dollar ranges are the build cost, not the cost to swap a single failed Schluter component. If the question is “what does it cost to fix a failed shower waterproofing detail,” the repair is typically a bathroom remodel in miniature: demo the affected tile, correct the membrane and banding, re-tile and re-grout, which lands in the $9,000 to $28,000 range for a full bathroom rebuild or less if the damage is contained to a single wall.
Every price we give is written before work starts. Labor is broken into stages, materials are named by model (KERDI-BOARD, DITRA, KERDI-BAND), and there are no allowance line items that quietly grow once the crew is standing in your kitchen. The 365-Day Done Right Promise covers the finished work: if something isn’t right after the job is complete, we make it right.
DIY or Call Us?
There’s a safe middle for a homeowner who wants to understand the problem before calling. You can inspect the grout lines, tap tiles for hollow sounds, and check whether water beads on the surface or soaks into the grout. You can photograph what you find and have it ready when you call. What you shouldn’t do is cut into KERDI-BOARD or pull tile off a Schluter membrane to “take a look.” Once the waterproofing layer is breached, you’ve turned a seam repair into a full panel replacement, and the window for a manufacturer warranty claim has likely closed.
Schluter waterproofing is not inherently dangerous to work with, but the craftsmanship bar is high. The thin-set coverage requirements, the banding overlap, and the drying timelines between layers are specific, and a missed step shows up as a leak six months later, not a leak tomorrow. That’s the kind of mistake we’d rather not see a Jacksonville family inherit from a rushed weekend repair. If you suspect a Schluter detail has failed, call (904) 643-6243 and we’ll walk through what you’re seeing.
FAQs
A properly installed Schluter assembly should last the life of the tile installation; the failures we see are almost always installation errors that appear within the first two years. Florida humidity shortens thin-set working time but doesn’t shorten the life of the cured assembly. Call (904) 643-6243 if you’re seeing signs of a failed detail, and we’ll give you an honest read on whether it’s a repair or a redo.
Yes, if the failure is caught early and contained to the seam or banding area, the repair is often localized: remove the affected tile, re-band the corner with the correct 2-inch overlap, flood-test the repair, then re-tile. If water has sat behind the membrane long enough to damage framing, the repair scope grows. An inspection tells us which one you’re in.
A contained seam repair runs three to five days, including the Schluter-required 24-hour flood test before tile goes back up; a full shower rebuild is one to two weeks. A home addition or ADU build with Schluter throughout is a multi-month project, and the waterproofing phase has its own place on the schedule, with drying windows we don’t compress. We’ll name the day each stage happens in the written scope before work begins.
We stock the common items: KERDI-BAND in multiple widths, inside and outside corners, KERDI-BOARD in the common thicknesses, DITRA and DITRA-HEAT membrane, and a range of SCHIENE and RONDEC profiles. Anything unusual is ordered for the job and checked against the Schluter spec sheet before it’s installed. Alongside Schluter, we also install named-brand materials from KraftMaid, Cambria, and Silestone, each written into the estimate by name.
If you’re planning an addition or ADU in Jacksonville and want the Schluter system done to the manufacturer’s spec, call (904) 643-6243 to schedule a free estimate. Graham Stein walks every job before the price is written: name the material, name the day, name the price – then there is nothing left to wonder about.
Written by Graham Stein, Owner, Elmstead Remodeling Jacksonville at Elmstead Remodeling Jacksonville, serving Jacksonville and nearby areas.
