Accessible Showers
What a curbless shower actually requires
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Short answer
A curbless shower needs floor structure that can be recessed or built up to create slope, a drain layout that lets the floor fall in as few planes as possible, a wet zone large enough for the spray, and a containment strategy that replaces what the curb used to do. Over a crawlspace it is usually straightforward; over a slab it takes more work.
Key takeaways
- Slope of roughly a quarter inch per foot has to exist without a step up.
- Recessing the subfloor between joists is the usual method in crawlspace homes.
- A linear drain at the back wall simplifies slope and suits large-format tile.
- The waterproofed zone extends past the shower opening into the room.
- A splash screen or extra wall length replaces the curb's containment.
The structural question comes first
Everything else follows from whether the floor can accept the slope. In a home over a crawlspace — which describes a large share of single-story housing in Meridian, Kuna, Star and Middleton — the subfloor can typically be recessed between joists, sometimes with sistered framing to keep the structure sound. Over a concrete slab the options are cutting the slab for a new drain, or building the entire bathroom floor up so the shower can sit level with it.
If a contractor proposes a curbless shower without first looking at the floor structure from below, that is a warning sign rather than confidence.
Keeping water where it belongs
- Size the wet zone for the spray pattern, not just for the standing area
- Keep the shower head aimed away from the open entry rather than toward it
- Extend waterproofing and tile beyond the shower opening into the room
- Use a fixed glass screen to intercept spray while keeping the entry clear
- Consider a linear drain positioned across the wettest zone, not just at the geometric center
Designing for who will use it
A curbless entry is only half of an accessible shower. The other half is what is on the walls and in the floor plan: blocking for grab bars, a seat at a height that works, a hand shower reachable while seated, controls placed near the entry so water can be started without standing under it, and slip resistance chosen for wet bare feet.
- Continuous plywood blocking behind the tile at grab-bar height across the whole wall
- A bench or fold-down seat, generally in the 17 to 19 inch seat-height range
- Valve located so it can be reached from outside the spray
- Clear entry width planned around a walker if that is a realistic future need
- Lever handles and a hand shower on a slide bar rather than a fixed head alone
Frequently asked questions
- Will a curbless shower work over a concrete slab?
- Sometimes, by cutting the slab for the drain or by raising the surrounding floor. It is more involved than in a crawlspace home, and occasionally a very low curb is the more sensible answer.
- Does a curbless shower need a door?
- No. Most are built with a fixed glass screen and an open entry, which is what makes them usable with a walker or a shower chair.
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