Tile & Materials
Choosing shower tile and grout that stay looking good
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Short answer
For most Idaho showers, porcelain on the walls and a small-format porcelain or mosaic on the floor is the durable default. Grout choice matters more than most people expect: cement grout is easier to install and repair but needs sealing, while epoxy grout resists hard-water staining far better and is unforgiving to install.
Key takeaways
- Porcelain absorbs very little water and is the safest default for wet areas.
- Shower floors need slip resistance — ask for the tile's DCOF value.
- Smaller floor tiles mean more grout joints, which means more grip.
- Epoxy grout resists hard-water and iron staining better than cement grout.
- Every change of plane gets flexible sealant, never grout.
Picking the tile
Wall tile and floor tile are different jobs. Walls can be almost anything rated for wet use; the shower floor has to be safe underfoot when wet and soapy, and has to be small enough to follow the slope toward the drain without lippage.
| Material | Walls | Shower floor |
|---|---|---|
| Porcelain | Excellent | Excellent in small formats or textured finishes |
| Ceramic | Good | Only if specifically rated for floor and wet use |
| Natural stone | Good with sealing | Possible, but porous and needs a maintenance routine |
| Glass | Good as accent | Not recommended underfoot |
| Large-format slab | Excellent, minimal joints | Not suitable — cannot follow a four-way slope |
Cement grout or epoxy grout
| Cement grout | Epoxy grout | |
|---|---|---|
| Staining | Absorbs; needs sealing | Highly stain resistant |
| Hard water | Shows mineral film sooner | Cleans up more easily |
| Installation | Forgiving, widely used | Short working time, demands skill |
| Repair | Straightforward to patch | Harder to blend a repair |
| Cost | Lower | Higher, in both material and labor |
With Treasure Valley water on the hard side — and harder still on many private wells in Canyon and Gem County — epoxy grout is worth considering on shower floors and in the lower courses of the walls, where mineral film accumulates fastest.
Living with it
- Squeegee the glass and walls after showering; it is the single highest-return habit for hard water
- Run the exhaust fan during the shower and for fifteen to twenty minutes afterwards
- Use pH-neutral cleaners; acidic descalers etch stone and degrade cement grout
- Reseal cement grout and natural stone on the schedule the manufacturer specifies
- Replace silicone at the wall-to-pan joint when it discolors or lifts, rather than caulking over it
Frequently asked questions
- What is DCOF and why should I ask for it?
- Dynamic coefficient of friction is the published measure of how slippery a tile is when wet. A tile rated for wet floor use will have a value stated by the manufacturer; a wall tile in the same range often will not.
- Do dark grout colors hide hard-water spotting?
- They hide dirt but show mineral film more clearly, because the deposits are pale. A mid-tone grout is usually the most forgiving choice with hard water.
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