Curbless shower installation in St. George: 7 questions before demolition

A curbless shower looks simple because the finished entry has no raised curb. The construction is more demanding precisely because that curb is gone. The floor must still create the required drainage path, the waterproofing must continue through a transition that people walk across, and the finished bathroom floor has to meet the shower at the planned elevation.

This evergreen guide answers seven questions to resolve before curbless shower installation in St. George. It applies to early planning for remodels and new construction; the selected system's current instructions, project design, inspections, and applicable requirements must control the final work.

1. What does “curbless” need to accomplish?

Curbless means there is no raised threshold at the shower entry. It does not automatically mean doorless, wheelchair accessible, roll-in, wet room, or compliant with a particular accessibility standard. Those outcomes may overlap, but each adds its own space, fixture, clearance, containment, and user requirements.

Write down the real goal before choosing products. Is the priority a clean uninterrupted tile line, easier entry, room for a walker, wheelchair use, aging in place, easier cleaning, a large doorless shower, or a formal accessibility requirement? Ask the intended users how they enter, transfer, reach controls, use a bench or handheld spray, and move through the rest of the bathroom.

For a project that must comply with the ADA Standards, use the applicable design professional and current requirements—not the word “curbless” in a proposal. The U.S. Access Board's bathing-room guidance treats shower compartment size, clearances, grab bars, seats, controls, spray units, thresholds, and enclosures as coordinated requirements. A private residential aging-in-place project may have different governing requirements, but it still benefits from a user-specific plan.

2. How will the floor create both slope and a flush entry?

The finished shower floor needs to reach the drain while meeting the bathroom at the intended height. That requires an elevation strategy before framing, plumbing, tile, and door clearances are locked.

Schluter's current curbless-shower overview describes three system-specific approaches: recess the shower floor, combine a prefabricated tray with a ramp, or raise the surrounding bathroom floor. These are useful planning categories, not universal instructions for mixing products from different systems.

Recessing can preserve the surrounding floor height by lowering the shower assembly. On a wood-framed floor, that means the joist layout and everything inside the floor cavity matter. On concrete, the slab type, reinforcement, utilities, and approved demolition method matter. Never cut, notch, or alter structural members or a slab based only on the desired tile elevation.

A ramp can preserve the existing floor structure but creates a transition that must fit the room, doorway, circulation path, and accessibility goal. Raising the bathroom floor can meet the shower height without lowering the structure, but it changes the bathroom entry, toilet flange, cabinetry, doors, transitions, and finished elevations.

Choose the strategy by drawing the entire floor build-up from structure to finished tile. Include the shower base or mortar, membrane, uncoupling layer if used, setting material, tile thickness, surrounding underlayment, heated-floor system if any, and every adjacent finish.

3. What might demolition reveal?

Curbless feasibility in a remodel often depends on hidden conditions. Before the design is treated as final, investigate the joist direction and spacing, blocking, plumbing route, drain and trap location, HVAC ducts, wiring, post-tension or other slab conditions, existing floor layers, rot or water damage, and the height available at the bathroom doorway.

Manufacturer systems have their own compatibility limits. For example, Schluter's KERDI-SHOWER-FRS documentation describes a bracket system for compatible wood-framed floors that supports a recessed subfloor without cutting or notching the joists. It is not a solution for every floor, and its component, spacing, subfloor, drain, and cavity requirements must be checked before selection.

Consider a controlled exploratory opening when the floor structure is uncertain. Set an allowance or decision point for rerouting plumbing, relocating a drain, moving a duct, correcting damaged framing, or choosing a different elevation strategy. A responsible estimate should explain what is known, what remains concealed, and what could change after demolition.

4. Have the drain, tile, and layout been selected together?

A point drain generally creates slope from several directions. A linear drain can allow a different slope geometry depending on its location and approved assembly. That choice affects tile format, cut shape, grout lines, grate style, drain rough-in, showerhead position, glass, and the visual line at the entry.

Do not select a drain only from a finish sample or move it after the floor system is ordered. Confirm the exact drain and bonding connection, outlet location, plumbing access, approved shower base or mortar assembly, grate elevation, tile thickness range, and how the layout will meet walls and the bathroom floor.

Large tile may not conform neatly to a multi-directional shower slope without planned cuts. Mosaics introduce more joints and their backing must be suitable for the selected installation. Natural stone adds product-specific absorption, finish, maintenance, and setting-material questions. Review the actual tile with the slope geometry and drain before ordering.

Surface choice also affects use. Discuss expected bare feet, water, soap, cleaning products, grout maintenance, and any project-specific traction requirement. A beautiful showroom finish should not be approved for the floor without confirming its intended wet-area use and care guidance.

5. Where does the waterproofing end?

With no curb, the shower entry is not a physical boundary between wet and dry construction. The design needs a documented waterproofing extent across the entry, around the drain, at floor-to-wall connections, at penetrations, and wherever water or drying activity can reasonably occur.

Follow one approved assembly and current instructions rather than combining familiar pieces informally. In its KERDI-SHOWER-FRS instructions, Schluter calls for waterproofing in floor areas subject to water exposure and cites an industry recommendation to continue waterproofing at least one foot beyond the shower area. That statement belongs to the referenced guidance; the project team still needs to determine the complete protected area for the room and selected system.

Plan inspections and testing before tile hides the membrane. The same Schluter instructions strongly recommend a water test before setting tile, direct users to wait at least 24 hours after membrane installation under the stated conditions, and require a temporary dam for testing a curbless entry. Other systems and local requirements may use different cure periods or procedures, so the selected instructions and inspector control.

Protect the waterproofing after it is accepted. Glass, partitions, benches, doors, cabinets, and grab-bar accessories should have planned attachment details so later trades do not improvise penetrations through the shower floor or other protected areas.

6. How will the room control spray and everyday water?

Curbless does not have to mean doorless. A fixed panel, full enclosure, door, partial wall, or carefully planned open layout can all be considered. The choice affects entry width, cleaning access, splash, privacy, warmth, ventilation, and how much of the room must tolerate water.

Draw the showerhead, handheld spray, body sprays, controls, bench, glass, drain, and entry on the same plan. Consider the direction and reach of spray, the depth between the showerhead and opening, water that follows a door, towel and mat locations, and the path from the shower to the vanity or toilet.

A glass panel cannot repair an incorrectly built slope or disconnected waterproofing. Likewise, a properly waterproofed room can still be unpleasant if spray reaches the doorway, toilet paper, cabinetry, or electrical devices. Resolve containment and daily use before rough-in, then verify the plan again when wall and glass dimensions are known.

7. Does the whole bathroom support the accessibility goal?

Removing the curb eliminates one obstacle, but the route may still be limited by a narrow door, tight turning space, slippery finish, unreachable controls, poorly placed bench, missing blocking, or a raised transition at the bathroom entrance.

Plan clear floor space, doorway and approach, control location, handheld spray, seat or bench, grab-bar blocking, toilet and vanity clearances, lighting, ventilation, storage, and emergency access around the actual user. If future grab bars are possible, coordinate continuous blocking and photograph it before the walls close.

Do not advertise a residential shower as “ADA-compliant” merely because it is curbless or uses a ramp product. Formal accessibility depends on the complete design and the rules that apply to the project. For a household goal, use plain language such as step-free entry or aging-in-place planning and document the user's needs without promising that one feature solves every mobility concern.

What to send for a curbless shower estimate

Send the project address, room measurements, photos, plans, floor type if known, level below or access beneath the bathroom, existing shower or tub dimensions, desired entry, intended user needs, drain preference, tile links and thicknesses, shower fixtures, glass concept, heated-floor plans, adjacent flooring, door clearances, demolition scope, and desired timing.

Exquisite Tile provides custom tile showers, waterproofing, linear drains, floor preparation, and tile installation for St. George and Southern Utah. Request an estimate so the floor construction, elevation strategy, selected products, and complete scope can be reviewed before curbless feasibility is confirmed. Compare this guide with our custom shower decisions before demolition. Builders can organize plans, finish schedules, responsibilities, and deadlines through the Builders & Commercial bid checklist.