Mosaic Bathroom Tiles in Glass, Marble or Stone

The best mosaic bathroom tiles are the ones whose material suits how wet each surface gets. Glass mosaic does not absorb water, so it is the easiest choice for showers and splash zones. Marble mosaic brings softer colour and a natural feel, but it is porous and needs sealing and gentle cleaning. Stone and porcelain sit between the two. Pick the material first, then the size, colour and grout, and the bathroom will look good for years rather than months.

Glass, marble or stone for a wet room

Each material behaves differently once water and soap are involved, so it helps to know what you are choosing.

• Glass mosaic. Glass is non absorbing, so water and the moisture in the adhesive cannot soak into the tile. It is a natural fit for shower walls, niches and the area around a bath. Because many glass tiles are translucent, the adhesive behind them affects the colour you see. Fixers usually use a white adhesive to keep colours clear, and full, even coverage so no trowel lines show through.
• Marble mosaic. Marble is a natural stone with real depth and veining, and small pieces make it easier to work around curves and slopes. It is porous, so it should be sealed with a penetrating sealer to resist staining, and resealed from time to time, more often in a shower than on a dry wall. Marble is also sensitive to acids. Acidic cleaners and descalers can etch and dull the surface, and a sealer does not stop that, so it needs pH neutral products.
• Stone and porcelain. Limestone and travertine need the same care as marble. Porcelain mosaic is dense and hard wearing, which makes it a practical mosaic floor for a busy family bathroom.

Whatever you choose, the tile is only one layer. In a shower, the wall or floor behind the mosaic is normally waterproofed first, and the adhesive and grout should be products made for wet areas.

Mosaic shower floors, slip and grout lines

Mosaic is a favourite for shower trays and walk in showers for a good reason. Small tiles can follow the fall towards the drain far more easily than large format tiles, which would have to be cut or would sit unevenly. The many grout joints also give your feet more to grip than one wide, smooth surface, and wider joints add a little more grip again.

The trade off is cleaning. More grout lines mean more places for soap, body oil and hard water marks to collect. That is why grout choice matters so much in a mosaic bathroom.

• Epoxy grout absorbs virtually no water and resists stains and chemicals very well. It is the low maintenance option for shower floors and glass mosaic, though it is harder to apply and is best left to an experienced fixer.
• Cement based grout is easier to work with and comes in many colours, but it is porous and usually needs sealing in a wet area to stop it staining or darkening.

Where the floor meets the wall, and at internal corners, a flexible silicone sealant goes in rather than grout, so the joint can move without cracking.

Colour and pattern

Mosaic gives you more control over colour than almost any other wall finish, because every small piece can be a different shade. A few ways to use that well.

• Keep the main walls calm and let a single panel carry the colour, such as the back of a shower or the wall behind a basin.
• Choose grout as part of the design. A grout close to the tile colour makes the surface read as one sheet. A contrasting grout draws out the grid and the shape of each piece.
• Use blends of three or four tones of one colour to give movement without busyness, which suits small bathrooms.
• Marble mosaic in herringbone, basketweave or simple borders brings a classic look, while glass suits bolder colour and light catching finishes.

Ready made sheets or a bespoke design

Most mosaic is sold as ready made sheets, with the small pieces held on a mesh backing or a paper face. Sheets are quicker to fix, give an even pattern and are the sensible choice for large areas of plain colour or a repeating design.

A bespoke mosaic is designed for one wall or floor. It can be a pattern drawn to fit the room, a picture, or a logo or monogram, and it is laid to suit the exact size of the space so borders and centre lines fall where they should. Many people combine the two, with ready made sheets on most of the room and one bespoke panel where it will be seen. Zavoré supplies ready made mosaics, designs bespoke mosaic, and installs both, including mosaic you have bought elsewhere. You can see the options on our mosaics page.

Installation basics

Good mosaic depends on what you cannot see. The basics a fixer will work through are these.

• A flat, sound background. Small tiles follow every bump, so walls and floors need to be true before tiling starts.
• Waterproofing in wet zones. Showers and wet room floors are waterproofed before any tile goes on.
• The right adhesive. White adhesive for glass, an adhesive suited to natural stone for marble, and full coverage so nothing shows through.
• Sealing natural stone. Marble and other stone are usually sealed before grouting so grout cannot stain the surface, then again once the grout has cured.
• Grouting in small areas. Grout is worked in and cleaned off a section at a time, before it starts to set on the face of the tiles.

If you are weighing up mosaic against a seamless finish, our guides to tadelakt bathrooms and microcement in bathrooms cover the alternatives, and many bathrooms use both.

Questions we get asked

Is marble mosaic a good idea in a shower?

It can be, as long as you accept the care it needs. Marble must be sealed and resealed, cleaned with pH neutral products, and kept away from acidic cleaners and descalers. If you want something closer to no maintenance, glass or porcelain mosaic with epoxy grout is easier.

Are mosaic tiles slippery on a bathroom floor?

Mosaic is usually less slippery than large polished tiles because the grout joints give grip. A honed or textured finish helps further, while highly polished stone is best kept to walls.

Do I need to seal glass mosaic?

The glass itself does not absorb water and does not need sealing. A cement based grout between the pieces usually does, which is one reason many people choose epoxy grout with glass.

Can you fit mosaic I have already bought?

Yes. Zavoré installs mosaics bought elsewhere as well as the ranges we supply, and can advise on adhesive and grout for the material you have chosen.

Where to go next. Browse ready made and bespoke options on our mosaics page, read our guide to mosaic splashbacks and grouting, or see how plaster finishes work in wet rooms in our Venetian plaster bathroom guide. When you are ready to talk about your bathroom, get in touch or call or WhatsApp 07592 929191.