If you have been researching shower tile installation, you have probably come across both GoBoard and Schluter KERDI. They are the two most common dedicated waterproofing systems used in residential shower construction, and both are legitimate products with real track records. The question is not which brand is better — it is which system makes more sense for your specific shower.
We use both at KV Tileworks. Here is how we think about the choice.
What Is GoBoard?
GoBoard (made by Johns Manville) is a rigid foam panel with a fiberglass-mat facing on both sides. The foam core is inherently waterproof; no separate membrane is required. You fasten the panels to the studs, tape the seams and fastener heads with GoBoard joint tape and the manufacturer's adhesive, and tile directly over the surface.
Key characteristics:
- Substrate and waterproof barrier in one panel — no separate membrane step
- Lightweight and easy to cut with a utility knife
- Faster installation on clean, simple layouts
- Requires fewer products in the installation system
- Works well with standard thinset adhesives for most tile types
GoBoard is particularly efficient in a standard rectangular shower with flat walls and a pre-sloped foam pan. You can frame, board, tape, and be ready to tile in a single day on a simple enclosure.
What Is Schluter KERDI?
Schluter KERDI is a polyethylene-based sheet membrane that you apply over a substrate — typically cement board or KERDI-BOARD. The membrane is set into unmodified thinset, with KERDI-BAND applied at seams, inside corners, and all transitions. Tile goes over the membrane in the same unmodified thinset.
Schluter has an extensive ecosystem of accessories that integrate with KERDI:
- KERDI-BOARD: A foam-and-fleece panel similar in concept to GoBoard, used as the substrate when you want to stay within the Schluter system
- KERDI-DRAIN: A drain body designed to integrate directly with the KERDI membrane, providing a bonded waterproof connection at the most vulnerable point in any shower floor
- KERDI-SHELF and KERDI-NICHE: Pre-made recessed shelf and niche units that tile into and waterproof easily within the system
- KERDI-LINE: Linear drain option for curbless and zero-threshold showers
The membrane-over-substrate approach also makes KERDI somewhat more forgiving when walls are not perfectly plumb or flat, because you are setting the membrane in a thin mortar bed that can accommodate minor surface variation.
Cost Difference
GoBoard panels tend to cost less per square foot than KERDI-BOARD, and the system has fewer material components overall. For a standard 3x5 shower, the material cost difference between the two systems is usually in the $100–$250 range. That gap narrows significantly when you factor in KERDI accessories for a more complex layout.
Labor is similar in skilled hands. GoBoard is somewhat faster on simple enclosures. KERDI takes a bit more time to apply the membrane properly — but that extra step is also the reason the system has such a strong track record in complex layouts.
When We Use GoBoard
GoBoard is our default choice for straightforward rectangular showers where:
- The walls are plumb and the layout is clean
- There are no unusual penetrations or complex niches
- Speed is a priority (renovation with limited downtime)
- The shower floor is a pre-sloped foam pan (which handles the floor waterproofing separately)
For a standard tub-to-shower conversion or a simple three-wall alcove shower, GoBoard gets you to a tileable surface efficiently without compromising the waterproofing integrity.
When We Use Schluter KERDI
KERDI is our preference for more complex layouts and where the integrated accessory system adds real value:
- Curbless or zero-threshold showers where the KERDI-LINE drain or KERDI-DRAIN integration is cleanest
- Showers with multiple niches or shelves (KERDI-SHELF and KERDI-NICHE simplify the waterproofing at those details)
- Unusual footprints — L-shaped enclosures, corner entries, or non-standard angles — where the membrane's flexibility over seams and corners is an advantage
- Jobs where an engineer or inspector requires a documented, tested waterproofing system with clear installation specifications
- Wet room applications where floors and walls are fully continuous
What Both Systems Require to Work
Both GoBoard and KERDI will fail if the underlying conditions are wrong or the installation is careless. The things that matter regardless of which system you use:
- Proper framing: Studs at 16 inches on center, no movement or flex in the structure
- All seams and fastener penetrations sealed: On GoBoard, every screw head and joint must be taped. On KERDI, every seam and corner gets KERDI-BAND set in unmodified thinset.
- Correct thinset: KERDI requires unmodified thinset for the membrane layer. GoBoard works with standard polymer-modified thinset. Using the wrong product is a documented failure mode.
- Pan slope: The shower floor must slope to drain at a minimum of 1/4 inch per foot. This happens at the mud bed or foam pan level, not the tile level.
- Penetrations sealed: Mixing valve, niche transitions, curb details — every penetration through the waterproofing plane needs to be sealed before tile goes up.
For a deeper look at what happens when any of these steps get skipped, read our post on why tile showers fail.
Our Recommendation
We spec the waterproofing system in every written estimate and explain why we chose it for your specific layout. We do not use "waterproofing" as a line item with no brand attached — that is a red flag in any estimate you receive.
If you are planning a shower remodel in Sanford, Lake Mary, Heathrow, or Winter Park, get in touch for a written estimate. We will walk the space, assess the layout, and tell you exactly which system we recommend and why.