Why a small format suits this floor
A bathroom floor has more edges per square foot than any other floor in a house. It meets a tub, a shower curb, a vanity toe kick, a toilet flange and usually a door threshold, all inside a few dozen square feet. A small piece follows those edges with less cutting, and a sheet can be trimmed between its pieces.
The second reason is the slope. A floor with a drain in it is not flat, and a large rigid tile has to bridge a plane that changes direction. Small pieces on a flexible sheet sit down on a curved surface in a way a single large tile does not, which is why mosaic and drains keep company.
Porcelain and ceramic mosaic
Porcelain and ceramic together make up about a third of this range, and outside the trade the two words get used interchangeably. The difference is the body: porcelain is fired denser and absorbs very little water, while a glazed ceramic body is more porous underneath a surface that is not.
On a bathroom floor that matters at the cut edge and at a chip, since a glaze keeps water out either way. Porcelain also arrives in through-body colors, so a chipped edge shows the same color as the top. The same bodies in field formats are in porcelain tile.
Marble, limestone and terracotta
Marble is the single largest material here and it runs through the names that supply it: Bardiglio in gray, Alpina and Blanc in white, Royal Beige, and the limestones Jerusalem and Paris. Terracotta appears as hexagons in the fired-clay family, unglazed and closer to a brick than to a tile.
Stone mosaic is cut from the same blocks as stone tile, so it carries the same carbonate chemistry: an acidic product left on marble or limestone leaves an etch where it sat. The marble mosaic range covers the shapes across materials.
Glass mosaic and where it belongs
Glass is the other large group on this page and it behaves differently from everything else on it. A glass mosaic has nothing porous behind the surface at all, so water has nowhere to go into it. That property is what put glass on shower walls, pool linings and bath surrounds long before it reached a floor.
What it is meant for is the part worth reading, because on glass it varies more between two similar-looking sheets than it does in any other material here. The published usage sits on each product, and the glass sheets that do belong on a floor are the anti-slip ones, which say so in their name. The rest of the glass on this page earns its place on the walls of the same room, which is where most bathroom glass goes.
Hexagon, herringbone and basket weave
Shape does most of the work on a bathroom floor, because the color range here is narrow and the area is small. Hexagon is the classic, and on a floor that falls toward a drain a six-sided piece has no long axis to fight the slope, though a small square follows a changing plane more closely still.
Herringbone brings direction, which can lengthen a narrow room when the runs point the long way, and here it is almost entirely marble. Basket weave and the 1x1 and 2x2 squares are the period options, and the square grids are the ones that carry a border or an inset without arguing with it.
Sheet sizes and the numbers on a listing
The 12x12 filling the size list is a sheet measurement, which is a foot of mesh rather than a foot of stone. So are the odd figures beside it, the 11 3/4 by 11 1/2 and the 10 3/8 by 12 and the 12 1/8 by 13 3/8, where a pattern sets the outline.
Coverage is the figure that turns a floor measurement into an order, and on mosaic it is the only reliable one. A box here covers around four to six square feet in most cases, with a few large-sheet products reaching into the twenties, and the piece count behind that coverage tells you nothing about the area.
Finish on a floor that gets wet
Polished is first, with honed behind it and matte, glossy and textured after that. A small group is made as an anti-slip surface and says so in the product name, which is the only place that distinction shows in a catalog.
The thing that is specific to mosaic is that the joints do part of the work. A floor made of small pieces has a grid of joint lines across it, and that grid gives a wet foot something to hold whatever the surface of the pieces does. It is the reason a polished mosaic behaves differently underfoot than the same glaze on a large field tile does.
Thickness of a mosaic sheet
Two groups cover most of this range: 3/8 inch and 13/64 inch, which is a thin sheet by any standard. The thin ones are mostly the fired mosaics and the thicker ones the stone, because a stone piece has to be cut deep enough to survive being cut at all.
Thickness is what decides whether a new bathroom floor lands level with the hallway outside it. A 13/64 sheet and a 3/8 sheet are 11/64 of an inch apart, a shade under a fifth of an inch, before anything goes underneath either of them. On a doorway that is the difference between a flush threshold and a step.
Color in a small room
White leads, then multicolor, then gray and beige. Multicolor sitting that high is a fact about mosaic: a patterned sheet is counted as multicolor even when it reads as one tone from standing height.
In a room this size a floor is seen as a single surface and not as a set of tiles, so a busy sheet can behave like a solid color and a plain sheet can look empty. That is the argument for a sample on a bathroom floor more than anywhere else in the house.
Mosaic elsewhere in a bathroom
The same sheets appear on the walls and in the shower, and the lists differ by what the surface has to do. The shower floor tile range is the narrower one, since a shower pan adds a slip requirement a bathroom floor does not always carry.
For the rest of the room, the bathroom tile page holds field formats alongside these, and white mosaic and gray mosaic cover the two colors this range is mostly made of.
