Some of the technical terms used in plastering are given below in alphabetical order:

1. Background: This is the surface to which the first coat of plaster is applied.

2. Blistering: This is the development of defect in the form of one or more loose swellings on the finished plastered surface.

3. Cracking: This is the development of one or more fissures in the plaster due to the movements in the background or the surrounding structure.

4. Crazing: This is the development of a series of fine hair-cracks in an irregular pattern over the finished plastering.

5. Dado: This is the lower part of the plastered wall (up to 1.5 m above floor) which is more resistant then the upper part, in order to protect it from the effects of water used in floor-washing, dust, dirt, rubbing of walls due to furniture, etc.

6. Dots: These are the small projections of plaster, usually in the form of squares (15 cm x 15 cm), laid on the background for fixing of screeds, etc., on wall surface.

7. Dubbing Out: This is the process of filling up the voids or hollow spaces present in the solid wall before applying the plaster.

8. Finishing coat: The layer, in which the plaster is laid to cover the hole area, is called a coat. In plastering, two or three such coats are usually applied. The outermost top coat of the plaster is known as finishing coat. It is sometimes called as setting coat or skimming coat.

9. Flaking: The patches of plaster when scaled off either due to lack of adhesion or failure of bond with the under coat, is called ‘Flaking’.

10. Gauging: The mixing of various constituents of plaster in proper proportions is called ‘Gauging’.

11. Grinning: This is the reflection or appearance of the patterns on the surface of plaster or background due to the joints or other reasons.

12. Hacking: This is the process of roughening or solid back-grounds to provide suitable bond or key for plastering.

13. Keys: These are the indentations or corrugations on the surface of under-coat or background on which the plaster can be applied to form a mechanical bond with the surface.

14. Laitance: This is the thin layer of cement which forms a screen over the freshly laid concrete when subjected to excessive trowelling.

15. Peeling: This is the process of stripping-off the covering of plaster from the background.

16. Under Coats: These are the plaster coats applied under the finishing coat. These under-coats are applied to provide a smooth, uniform and sound finishing surface for receiving the final coat. The first coat is usually applied by dashing it against the wall and is termed as rough course of plastering. The second coat is applied with mason’s trowels and is made fairly smooth to receive final coat.

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Plastering

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