Types of plastering:-
There are different types of plasters are available such as:
- Lime plaster
- Cement plaster
- Mud plaster
- Stucco plaster
1. Lime plaster :-
- When lime is used as a binding material it is called lime plaster.
- Lime plaster is a type of plaster composed of hydrated lime, sand and water.
- Lime plaster is similar to lime mortar, the main difference is based on use rather than composition.
- Mortar for lime plaster is usually prepared by mixing sand and lime in equal proportions, to improve the strength small quantity of cement is added to it.
2. Cement plaster:-
- When cement is used as a binding material it is called cement plaster.
- It is specially suited for damp condition.
- Cement plaster is usually applied in one coat.
- Thickness of coat can be 12 – 15mm or 20mm depending upon site conditions and type of building.
- 6mm thickness of plastering of 1:3 or 1:4 Ratio is recommended for cement plastering of RCC surfaces.
3. Mud plaster:-
- The surface to be prepared exactly in the same manner as that of for lime plaster or cement plaster.
- Mud plaster is generally applied in two coats, the first coat being 18mm thick while the thickness of second coat kept 6mm.
4. Stucco plaster:-
- Stucco is the name given to decorative type of plaster which gives an excellent finish.
- Stucco plaster can be used for interior as well as exterior surfaces.
- It is usually laid in three coats making the total thickness of plaster about 25mm. The first coat is called scratch coat, the second coatis called fine coat, it is also known as brown coat and the third coat is called white coat or finishing coat.
Types of finishing:-
- Smooth cast
- Pebble dash
- Rough cast
- Texture finish
- Scrapped finish
1. Smooth cast:-
- It is a finish which presents levelled and smooth surface.
- The mortar for finish is made by mixing of cement and fine sand in the ratio of 1:3.
2. Pebble dash:-
- It is a finish in which the small pebbles or crushed stones of suitable size are throne on to a freshly applied finish coat of plaster and left exposed.
- The mortar finish is made by cement and coarse aggregate of 1:3 ratio.
3. Rough cast:-
- It is a finish in which the mortar for the final coat contains a proportion of fairly big size coarse aggregates.
- The mortar for finishing is made by mixing cement, fine sand and coarse aggregate in the ratio of 1: 1/2:3
4. Textured finish:-
- In this finish ornamental patterns or textured surface are produced by working with various tools in the freshly applied final coat.