| Porosity | In ceramic material it expresses the relationship of open pore space to bulk volume as a percentage.... | |
| Portland Cement | Used in screeds, renders, adhesives and grouts to comply with BS EN 197-1 Cement Composition, specif... | |
| Pourable Thickbed | Cement based tile adhesive, with additives, used in thicknesses up to 25 mm and applied by pouring r... | |
| Pricking up Coat | First or backing coat of a render or plaster.... | |
| Priming | The action of applying an acrylic or latex polymer primer to a porous or unstable background to assi... | |
| Quarry Tile | A traditional wet plastic clay product produced by pressing and then firing. Later production was ma... | |
| Ramp Test | One of the standard laboratory methods of testing slip resistance Ð see also pendulum test. Germ... | |
| Reaction Resin | Resin involving two or more components including synthetic resin and mineral fillers which requires ... | |
| Rectified | A process in which tile edges are sawn or ground to ensure all within a batch are exactly the same s... | |
| Reference Lines | Two lines, intersecting at 90 degrees, marked on wall or floor substrates during setting out, to est... | |
| Reinforcement | Mild steel mesh to BS 4483 with 2.5 mm diameter wire in mesh sizes 50 x 50 or 100 x 100 mm used in f... | |
| Render | A sand and cement backing coat for tiling, usually applied in at least 2 coats.... | |
| Rendering | The act of applying a render to a wall.... | |
| Roller Kiln | A modern kiln for firing ceramic tiles and sheets in which the product passes through in 24 hours on... | |
| Rounded Edge | Treatment of external angles by means of a rounded or glazed rounded edge. Now virtually obsolete an... | |
| Rubber Hammer | Heavy rubber hammer used in floor tiling to ensure good contact between tile and adhesive.... | |
| Rubbing Block | A silicone block or varying grit sizes to assist in the removal of rough edges and the forming of mi... | |
| Salt Glaze | Type of glaze used in the production of fireclay and faience. Still seen as salt glazed stoneware dr... | |
| Sand | Fine aggregates as described in BS EN 13139 Aggregates for mortar, used in rendering, screeding and ... | |
| Screed | Traditionally a sand and cement levelling layer prior to the application of floor tiles. Now often c... | |
