Why mosaic dominates a shower floor
A shower floor is a shallow cone, and a rigid tile cannot follow a cone. The bigger the piece, the more it bridges the fall, and the more it has to be cut into wedges to get there.
Small pieces on a mesh solve that by having a joint every inch or two. Each piece sits flat and the sheet as a whole takes the curve, which is why mosaic is most of this range and why the commonest listed size here is a 12x12 sheet rather than a 12x12 tile.
Grout joints and grip
The joints do a second job. A shower floor is walked on wet with bare feet, and the grip comes as much from the grout lines as from the face of the tile: a surface broken every inch has edges to push against. It is the part of a shower floor nobody photographs and everybody feels.
A small format is the traditional shower floor even in polished stone for that reason, and the reason a large smooth tile is the harder choice there however it is finished.
Stone on a shower floor
Marble is the largest material group here, in the white and gray Carrara and Calacatta family, with Thassos and Bianco alongside. Stone brings its own variation, since every piece came out of a block, and it brings its own conditions with it.
A carbonate stone reacts to acid, and a shower is where acidic cleaning products meet a floor most often. It is a material fact worth knowing before choosing: plenty of shower floors are marble and have been for a long time.
Honed, polished and textured faces
Honed is the largest group, which is the flat matte finish on stone. Polished is second, and a multi finish group sits alongside where a single sheet carries more than one face.
A smaller textured and rock face group exists for the people who want the surface itself to do the work. Where a project needs a measured slip class, and a description of a face is not one, that figure comes from the maker's data.
Pebble and the irregular formats
Some of these are not squares at all. Pebble and irregular sheets follow a slope more easily than any cut shape, because there is no straight edge to bridge with, and they put more joint per square foot into the floor than a grid does.
The trade is that an irregular surface holds more of everything, water and everything in it, and the texture is a decision to make with open eyes.
Shower floor sizes
The 12x12 figure that dominates this range is a sheet measurement: a foot square of mesh carrying pieces that are usually an inch or two across. A handful of larger formats sit alongside it, and those are for showers built to a single fall.
The odd fractional sizes in the list, the 11x17 and the 5 25/32, are the pieces cut to a pattern. Those arrive as their own sheet shape and cannot be assumed to tile out from a square.
Thickness under a shower floor
Almost everything here is 3/8 inch, and a shower floor is one of the places that figure matters beyond the tile itself. The floor is built up from a waterproofed base, and the finished level has to land where the door and the threshold expect it.
A thicker stone or a pebble sheet sits higher than a 3/8 mosaic, and that belongs in the build. That build is the business of whoever constructs the shower.
It is also the one dimension on a shower floor with a deadline attached. Once the curb is set and the door has been ordered to a height, the floor build up is fixed, and a sheet a quarter of an inch thicker than the one the pan was designed around has nowhere to go. So the thickness figure is worth reading alongside the pattern, which is earlier than most people reach for it.
Matching the floor to the walls
The commonest arrangement is a plain wall and a smaller floor in the same stone or a related one, so the floor reads as a deliberate change and not as a different room. The wall side of that decision is in shower tile.
Where the whole room is being tiled at once, the bathroom tile range covers the surfaces either side of the shower, and the mosaic page explains how sheets are sized and what the coverage figure means.
