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The increase in length per unit rise in temperature

A toothed tool, which makes it possible to apply adhesive as a series of ribs of a uniform thickness onto the fixing surface

A method used for installing tiles onto a plane surface with an adhesive. The adhesive is usually applied with a trowel to obtain a layer and then combed with a notched trowel to achieve the right thickness and planarity

The maximum time interval after application during which tiles can be embedded in the applied adhesive and meet the specified tensile adhesion strength requirement. It is measured following EN 1346

The largest common grain size of aggregate normally contained within a material. Occasional grains may exceed this figure

The measure of acidity or alkalinity of a solution, wet mix or paste. Water is neutral with a ph of 7, while acidic materials have a pH of less than 7 and alkalis a pH greater than 7

A cementitious adhesive or grout that has had its performance characteristics improved by the inclusion of various polymers. These can be part of the formulation of the powder product or added at the time of mixing in the form of an admixture

Porcelain tiles are fully vitrified and are fired at a higher temperature than ceramic tiles. Water absorption levels are lower at < 0.5% making them more difficult to adhere to

A measure of the voids in a material that afects its ability to absorb water. See {probsol,619}

The maximum time period during which the adhesive or grout can be used after mixing

To use a specific liquid to reduce a substrateีs porostiy, improve the bond strength or prevent a chemical reaction between substrate and adhesive

The traditional term for single extruded natural clay tiles usually not exceeding 6% water absorption

A mixture of synthetic resin, mineral fillers and organic additives in which hardening occurs by chemical rection. They are available in one or more component forms

A mixture of synthetic resin aggregates, inorganic and organic additives in which hardening occurs by chemicla reaction. They are available in one more component forms.

A porous sedimentary rock quartz (silica) grains

To remove or roughen the surface layer of a substrate with the use of tools that employ multiple vibrating chisels or needles

The minimum time interval before the installation can be put into use

The period of storage under stated conditions during which an adhesive or grout may be expected to maintain its working properties

A reduction in length of a grout prism during hardening. It is measured according to EN 12808-4

A dense metamorphic rock that can be split into thin sheets and generally has a relatively smooth surface

The downward movement of a tile applied to a combed adhesive layer on a vertical or inclined surface. It is measured following EN 1308 : 1999

The percentage weight, usually of a water based dispersion, that would remain after evaporation is complete.

Plastic crosses used during installation of tiles to form even joint spaces between tiles.

Characteristics of the adhesive or grout which provide further information about its general performance.

The floor or wall to which tiling is to be fixed.

The force that draws water or liquid into a substrate or tile.

A system to stop water leaking into water sensitive substrates such as plywood or gypsum.

A traditional red porous tile that is generally quite thick. The surface is usually smooth and is sealed during installation to protect the tile.

Manufactured from chips of aggregate set into cement or resin. This is then ground down and polished to show a mix of agregate. Quite often manufactured to bespoke designs.

A specially-designed substrate for tile installation. They are generally very rigid and have a similar thermal/moisture expansion to tiles, making them ideeal background material. They are suitable for heavier tiles than canีt be used on plasterboard.

Deflection recorded at the centre when a beam of hardened adhesive is subjected to three-point loading. It is used to evaluate the deformability of the adhesive. It is measured following EN 12002.

A form of limestone that is often chosen due to it aesthetic qualities. It is often veined or pitted with bands caused by organic impurties.

A membrane used to reduce stress between a finishing layer and the substrate when there are likely to be different rates of expansion/contraction.

Either heated water pipes or warming electrical matting under the tiles. The heat the entire floor to a comfortable temperature of around 26ºC. Water pipes are generally classed as under-floor heating as they heat the whole room while electrical matting is usually classed as under-tile warming as it warms the tiles.

Thin layers of wood bonded at 90ºC to each other to form a rigid board that resists warping. WBP (Water and Boil-proof) grade is recommended for tiling.

The ability of a combed adhesive layer to wet the tile. It is measured following EN 1347.