Do you know your porcelain from your PEI rating and your sealant from your spacers?

Our ever-evolving glossary of tile terminology helps explain some of the words and phrases you might hear or read about when you’re choosing tiles.

Tile Terminology Glossary

Numbers

20mm tiles

2cm deep tiles are very strong, easy to install and can be removed easily, making them ideal for gardens. They are great to coordinate from indoors to outdoors.

A

Abrasion Resistance

2cm deep tiles are very strong, easy to install and can be removed easily, making them ideal for gardens. They are great to coordinate from indoors to outdoors.

Absorption

Absorption is the amount of water a tile absorbs. This is shown as a percentage made up of the ratio of the weight of the dry tile to the weight of the absorbed water.

Adhesive

Tile adhesive is used to fix tiles to the floor or wall. Adhesives can be flexible, waterproof or specifically for porcelain tiles.

Antique finish

This describes ageing/distressing methods used to imitate a worn look on stone.

B

Bevelled Edge

A tile with a bevelled edge will not be completely flat but will have an angled edge for safety, to prevent wear resistance or to simply look nice. Commonly found on metro or subway tiles for a more 3D effect.

Biscuit

Nothing to do with Digestives, this tile terminology is the main clay body of the tile that provides strength.

Brick Bond

A brick bond tile pattern is the same used with house bricks, where the joins are staggered. This is only suitable for tiles under 30cm x 60cm.

Bowing

Most tiles will have a slight bend due to the heating and cooling processes during production. This is called bowing or warping. It is less noticeable on smaller or square tiles but more obvious in larger rectangular tiles.

Brushed Finish

Brushed stone tiles have a smooth finish with a worn look that gives them a more natural or rustic appearance. This is achieved by sweeping a diamond-tipped wire brush across tiles such as limestone, sandstone and slate.

Bullnose or “RE” (Rounded Edge)

Bullnose tiles have characteristic rounded edges to give a softer look than sharp angles. They are used for edges or trims, to cover corners or to frame the perimeter of a tile design.

Butt Joint

Butt jointing is where tiles are laid closely together to create a small grout joint, commonly next to a wall. The usual spacing should be more generous to allow for grout.

C

Calibrated

Calibrated tiles meet the manufacturer’s calibre range, with less dimensional variation than natural tiles without mechanically finished edges.

Ceramic Tiles

Ceramic tiles are usually glazed, making them usually only suitable for walls, but there are some that can be used on floors. Ceramic tiles are man-made from clay, fired at a lower temperature and have greater water-absorbency than porcelain.

Chevron

Chevron tiles are cut with their short edges at an angle and should be supplied as left and right. They are used to create diagonal patterns.

Cove base tiles

Cove base tiles are often used at the base of a tiled wall instead of a tile baseboard. They have a flared edge to create a seamless and watertight transition between the floor and the wall.

Crackle Glaze

Crackle glaze tiles have a glossy surface with a cracked appearance. This used to be formed by thermal shock, freezing tiles immediately after going in the kiln to shrink the glaze, but modern crackle tiles are created with a specific glaze that shrinks in the drying process. Crackle glaze tiles MUST be sealed so they have an impenetrable barrier against dust, grout and moisture. Seal before and after grouting for the best results.

Crazing

Cracks that occur due to temperature change and vibration are a natural characteristic of glazed tiles.

Cross-cut

A technique used with Travertine stone where the tile face is at right-angles to the main direction of the veining. See vein cut.

Cushion Edge Tiles

Also known as non-rectified tiles and soft edge tiles, cushion edge tiles are not cut to size after firing, and have more variation in size. These tiles are usually glazed, patterned or smaller where cutting the tile would be detrimental to their appearance. They are also not as sharp and prone to chipping as rectified tiles.

D

Decor tiles

Decor or decorative tiles usually have a pattern that can be bold or subtle and can often be found alongside a neutral or plain tile in the same range.

Decoupling Membrane

A decoupling membrane is a type of matting made from plastic or fabric that helps prevent newly laid tile floors from cracking or lifting if the substrate beneath them cracks or moves. These are commonly found in new build properties where the foundation is settling in. You can use a decoupling membrane between tiles and underfloor heating as a precaution against cracks from the heat.

E

Encaustic tiles

Encaustic tiles are made of ceramic, with their patterns made up of different colours of cement and dye rather than a glaze on top. They commonly feature two colours but there can be more.

Epoxy Adhesive

Epoxy adhesives are super strong, created by polymerizing two starting compounds, the hardener and the resin. These adhesives have exceptional adhesion, chemical, heat and water resistance, and electrical and mechanical insulating properties.

F

Fissure

Often mistaken for a crack in the tile, a fissure is a thin line of mineral veining that usually contrasts with the stone’s base colour.

Flag/Flagstone

Large and thick stone tiles used internally or externally.

Flemish Bond

Flemish bond is a tiling style where rectangular and square tiles are laid together in alternate patterns to achieve a modular appearance with lots of interest.

Ceramic Versus Porcelain Tiles Comparison Table

-CeramicPorcelain
Best used forIndoorsWalls and floorsDomestic interiorsCommercial interior wallsLow foot traffic areasOutdoors Floors, some walls depending on the weight of the tilesCommercial propertiesAreas with high foot trafficHigh moisture level areas e.g. wet rooms
PropertiesSofter and less denseHarder and denser
Made fromRed, brown or white clayWhite clay, feldspar and sand
Fired at a higher temperature
ProsEasier to use
Great choice of designs
Less water absorbed
More hard-wearing
ConsMay crack in cold weatherLess choice of interesting designs
More brittle
PriceMore reasonably pricedMore expensive
Ease of cuttingEasy to cutCan be harder to cut

We hope our tile terminology guide has been helpful! If we’ve missed something out, please get in touch, we’d be happy to explain and add it to the list!

Still need any help?

Don't worry! We are happy to talk you through the process of determining how many tiles to buy and can give you advice if you're still not sure about anything.