Walk-In Shower Installation in San Antonio, Built From the Pan Up

Every walk-in shower we build follows the same layered logic. The floor is sloped toward the drain, usually a quarter inch per foot. A waterproof membrane runs across the floor and up the walls, tied into the drain so water that seeps through grout has nowhere to go but down. Tile and grout go on last. Skip or rush any layer, and the shower can leak into the slab, the wall framing or the room next door.

We use either a traditional mortar bed with a liner or a modern foam-and-membrane system, depending on the room. Before any tile is set, we plug the drain and fill the pan with water for a flood test, then check for any drop in level. It’s a simple step, and it’s how we catch problems while they’re still cheap to fix.

• Sloped pan, at least a quarter inch per foot toward the drain
• Waterproof membrane on the floor and all wet walls
• Membrane sealed or clamped to the drain body
• Flood test before tile installation
• Cement board or foam board behind tile, never plain drywall
• Sealed or stain-resistant grout

A standard walk-in shower has a curb, a raised lip 3 to 5 inches tall that keeps water in. It’s the simplest and most affordable option on a slab foundation. A low-threshold shower drops that curb to an inch or two, which makes stepping in easier without much slab work.

A truly curbless shower lets you roll or walk in with no step at all. On a slab, that usually means recessing the shower floor into the concrete so the tile can slope to the drain while the bathroom floor stays level. It’s more involved but worth considering if you plan to age in place. Our curbless shower page explains that process in detail.

Where the drain goes shapes the whole shower. A center drain needs the floor sloped from four directions, which calls for smaller tiles. A linear drain along one wall lets the floor slope in a single plane, so large-format tile works and a curbless entry is easier.

Moving a drain on a San Antonio slab means saw-cutting the concrete, trenching to the existing line and setting new pipe at the correct slope before patching. If you’re enlarging a shower, we try to keep the drain close to the original spot or use a linear drain that can sit along the old drain line. That keeps slab work, and cost, under control.

Expansive clay is the other slab concern here. As soils swell after rain and shrink in drought, foundations flex slightly, and a rigid shower floor can crack along that movement. We use a crack-isolation layer under the tile and leave flexible sealant joints at inside corners and where the walls meet the floor.

San Antonio’s hard water is tough on shower glass. Without a protective coating, clear glass shows white mineral spots within days. We recommend glass with a factory-applied coating that helps water sheet off, plus a squeegee after each use. A glass panel without a door, sometimes called a walk-in panel, has fewer seals and hinges to clean.

Fixtures matter too. A pressure-balancing or thermostatic valve keeps water from suddenly turning hot or cold. Showerheads with rubber nozzles let you rub off scale buildup with a thumb. Choose fixtures with replaceable cartridges, since mineral deposits eventually wear them out. Our hard water guide goes deeper on protecting new fixtures.

• Uncoated clear glass shows hard water spots almost right away
• Drywall behind a shower, even painted, will fail
• Shower floors without enough slope leave standing water
• Large tiles on a center-drain floor crack or lip at the slope changes
• A missing flood test can hide a leak until after the tile is set

A built-in bench gives you a place to sit while shaving legs, rinsing feet or resting. It needs to be waterproofed like the walls and sloped slightly so water runs off. A floating bench saves floor space, while a corner seat fits smaller showers.

Niches recessed into the wall hold shampoo bottles without hanging caddies. We size them to real bottle heights and slope their bottoms so water doesn’t pool. A handheld shower on a slide bar makes cleaning easier and helps when someone needs to sit. A grab bar near the entry adds stability, and our grab bar installation work places blocking in the wall so bars can be added at any time.

Walk-in showers move through a predictable sequence, with drying and testing time built in.

1. Design visit: we measure, check the slab and drain, and plan size, curb style and glass.
2. Selections: tile, valve, showerhead, drain and glass style are chosen and ordered.
3. Demolition: the old shower or tub is removed, and walls and floor are opened.
4. Rough plumbing: the drain is adjusted if needed and a new valve is set, with inspections when required.
5. Pan and waterproofing: the floor is sloped, the membrane goes on, and the pan is flood tested.
6. Tile: walls, floor, niches and bench are tiled and grouted.
7. Glass and trim: glass is measured after tile, then installed with fixtures, and the shower is tested.