PLASTERING

PLASTERING

Applying mortar coats for the surfaces of walls, columns, limit etc. to get smooth finish is called as plastering. Mortar used for plastering can be lime mortar, cement mortar as well as lime-cement mortar. Lime mortar used shall have fat lime to sand ratio of just one: 3 or 1: 4. If hydraulic lime can be used mix proportion (lime: sand) will be 1: 2. Cement mortar of just one: 4 or 1: 6 mix can be quite commonly used for plastering, richer mix being used for outer walls. To combine the fee effectiveness of lime mortar and quality of cement mortar many make use of lime-cement mortar of proportion (cement: lime: sand) of 1: 1: 6 as well as 1: 1: 8 or 1: 2: 8.

The objective of plastering are usually:
1. to conceal defective artistry
2. to give smooth surface in order to avoid catching of dust.
3. to offer good look.
4. to protect the wall from rain water along with other atmospheric agencies.
5. to safeguard surfaces against vermit.

Requirement associated with good plaster are: 

1. It will adhere to the background easily.
2. It should be hard and durable.
3. It need to prevent penetration by moisture
4. It should be cheap.
Lime mortar is usually utilized in 3 coats while bare concrete mortar is applied in a couple of coats for the stone as well as brick masonry. For concrete surfaces cement mortar may be applied in a couple of coats. For concrete building blocks more often than not only one coat of bare concrete mortar is applied. The first coat provides way of getting level surface.

The final coat provides smooth surface. If three coats are used second coat is referred to as floating coat. The average breadth of first coat is 10 to 15 mm. Middle coat breadth is 6–8 mm. The final coat is just 2 to 3 mm thick. If single coat can be used its thickness is kept in between 6 to 12 mm. Such coats are utilized on concrete surfaces not subjected to rain.