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Shower Niches

By kitchen and bath remodeling riverside field

Why the bottle shelf deserves a plan

Shampoo, conditioner, soap and a razor need somewhere to sit in the shower. A corner caddy hanging from the showerhead is one answer, but it crowds the space and rusts. A built in niche, a recessed shelf set into the wall, is the cleaner answer. It also happens to be one of the most failure prone spots in a tiled shower, because it creates a pocket of exposed corners, ledges and joints where water collects. Done carefully, a niche lasts as long as the shower. Done carelessly, it is where leaks and mold begin.

Framing the opening

A niche needs a hole in the wall, and the hole needs a frame. Standard studs are spaced at regular intervals, and the cleanest niche fits between two studs, using the bay's natural width. That leaves little to cut. Wider niches need a stud removed and a header added, which should be done by someone who understands load paths, particularly in a wall that carries weight from above.

Frame the top and bottom of the opening with horizontal blocking, set so that the finished interior is the size you want.
Keep the opening away from plumbing. Pipes behind the shower valve, the supply to the showerhead and any vent in the wall all compete for the same space.
Avoid exterior walls where possible. A niche thins the insulation, and a cold back panel encourages condensation. If an exterior wall is the only option, insulate behind the niche and seal the air gap.
Plan depth: a bay in a two by four wall gives about three and a half inches. That is enough for bottles of normal size.

Prefabricated niche inserts exist, made of foam board, molded plastic or similar material, and they come with built in slopes and finished edges. Many installers use them because they cut time and reduce the risk of misshaped shelves. Site built niches from cement board and waterproofing membrane are equally valid when carefully done.

The slope that saves the shelf

Water on a flat shelf sits, and standing water in a shower niche leads to staining and failures. The bottom of the niche should slope slightly toward the shower, so water drains out instead of pooling in the back. A small pitch, the sort measured in a fraction of an inch across the depth, is enough. Many prefabricated inserts have this slope molded in. In a site built niche, the installer builds it with a mortar bed or a pitched piece of backer board before the waterproofing goes on.

The top of a niche matters too. A flat or slightly sloped top prevents water from collecting on the ceiling of the niche and dripping onto the items inside.

Waterproofing: where niches fail

Tile and grout are not waterproof. The waterproofing layer lives behind them, either as a sheet membrane or a liquid applied coating. A niche has many inside corners and edges, and each must be covered without a gap.

Cover the cement board surfaces inside the niche, including the sides, back, top and sloped bottom.
Reinforce every inside corner with fabric or preformed corners, bedded in the membrane.
Extend the waterproofing beyond the niche opening onto the surrounding wall surface, so it overlaps with the main shower membrane.
Check coverage: liquid membranes often require a particular thickness, and a thin coat can leave pinholes.
Test the finished surface by flooding the niche with water and watching for leaks, if the product instructions allow.

The edges of the opening are the weak point. Shower membranes should lap into the niche, and the niche membrane should lap out over the wall, creating a continuous skin. Gaps at the corners are the usual cause of leaks that rot framing behind the tile.

Tiling the pocket

A tiled niche is a puzzle of cuts. The shelf, the sides and the back each need tile, and the edges must meet cleanly. A few choices make the work easier and the result more attractive.

Size the opening to the tile. If the wall tile has a grid, choose an opening that fits whole tiles or whole tiles plus clean cuts, to reduce the thin slivers that look awkward.
Line up with grout lines. A niche whose edges align with the wall's grout pattern looks intentional. A niche that cuts across tile joints looks improvised.
Use a solid shelf piece. A single slab of stone or solid surface across the bottom resists staining and has fewer joints than a row of small tiles.
Finish edges. Metal edge trim, a bullnose tile or a mitered corner protects the exposed outer edge.
Use flexible caulk at corners. The internal corners should be sealed with silicone, not rigid grout, because the two surfaces move at different rates.

Mosaic tile in the back of the niche is a common accent, and its many grout joints should be sealed or made with a stain resistant grout, since a niche gets repeatedly wet.

Where to place it

Placement is a balance of convenience and appearance. A niche at shoulder to chest height lets bottles be reached without bending. Placing it on the long wall opposite the showerhead keeps spray from soaking the contents. Directly beneath the showerhead is the worst place, since water pours straight in. A niche beside the valve is within reach from outside the spray, a plus when turning on the water.

Visibility counts as well. A niche on the wall visible from the bathroom door becomes part of the design, while one on the end wall may stay hidden. Consider two niches at different heights, one for bottles and a smaller one lower for a foot rest or a razor. A shelf at seated height suits people with limited mobility.

Sizing for real bottles

Measure the largest bottle in the household and add some room. A typical niche width runs wide enough for several bottles side by side, and heights should allow the tall shampoo bottle to stand upright with space to lift it out. A niche too short forces bottles to lie down. A niche too narrow holds only a couple of items. Depth beyond the bottle's diameter wastes space and puts items out of reach.

Common mistakes

A flat bottom that holds water.
Gaps in the membrane at inside corners.
A niche cut through plumbing or a vent.
Placement directly in the spray.
Rigid grout in the inside corners.
Tile joints that do not align with the wall grid.

Maintenance

Wipe the niche regularly, since soap residue and humidity encourage mildew in the corners. Check the caulk in the corners once a year, and replace it if it cracks or pulls away. If grout darkens or crumbles, address it early, because water that reaches the wall behind the niche may go unseen for years. A niche that is framed square, sloped, waterproofed thoroughly and tiled with attention to the details is one of the most convenient and attractive features of a modern shower.