Monday, May 24, 2021

What is Plastering? Importance and the Basic Process

 In a Building Plaster enhances the look and also protects the wall from moisture and other elements, it is done after completing the Masonry Work and before applying Paint.

“In Buildings, Plaster is like the Cloth for Walls”

~An Anonymous Civil Engineer

The usual Composition of Plaster is Cement, Sand and Water. It is a thin layer of mortar applied over the masonry surface and it acts as a damp-proof coat over the brick masonry work.

It is used on Masonry Walls, Ceilings and Partitions for giving them a firm look and improvising the overall look of the building.

Common Types of Plaster Used 

On the basis of raw materials Common Plater types are:

  • Cement plaster

  • Lime plaster

  • Gypsum plaster

  • Mud plaster

General Information

  • Average Plaster thickness varies from 10-15 mm for inner plaster and 15-25 mm for outer plaster

  • Brief Process, Cleaning of Surface Before Applying---- Applying Water----Preliminary coat of cement Slurry (Cement +Water) to fill up the voids in masonry----First Coat of 6-8 mm Applied---- 2nd Coat Applied

.Preparation Before Plastering

  • Any openings in the form of Electrical or Water Pipes is Closed.

  • Wire Meshes/Chicken Meshes are applied at all the junctions where cracks may arise.

  • Bull Marks for Measuring and keeping the plastering thickness uniform are given at proper intervals.

  • Walls are cured properly before plastering and made wet before plastering, cement slurry and water is also applied.

  • The mix ratio for plastering is usually 1:6, 1 part Cement for 6 Parts Sand, unless specified otherwise by the site incharge.

Instruments or Methods for Checking Plastering Process

  • Plumb Bob and Thread

  • Spirit Level



Curing of Plastering works

  • Curing Should Start immediately after 24 hours of completing the plaster.

  • The Plastered surface should be cured for minimum 7 days by spraying water, gunny bags or other materials can be used to retain the water.

  • The surface should be protected from extreme heat or frost conditions as they can result in cracks.

  • Proper Curing will help the masonry and plaster to develop the hardness and strength.

For more details, watch this: Why Curing is Important for a Building  in a Construction?

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