Mud Plaster6th November 2020
Mud plaster is another type of plaster which are mostly used in case village and temporary kutcha construction. This is the cheapest type of plaster.
It is made up of earth with an adequate percentage of clay and sand content. The earth should be free from any types of unwanted elements like grass, stone pebbles, roots, organic matter, etc. If clods are found in the excavated earth, they should be broken to the fine earth.
The soil is mixed with sufficient water and left to season for 5 to 7 days. To increased the strength of mud plaster, chopped straw or hemp are added to the seasoning mixture. Around 30 kg of chopped straw or hemp is used for 1 m3 of earth.
During the seasoning period, the mixture is worked up from time to time under cattle feet and converted into a homogeneous mass. The mud mortar is now ready for plastering.
The surface which is to be plastered should be prepared in the same way as for cement plaster or lime plaster. Loose dust should be removed from surface joints. Before beginning the plastering work, the surface which is to be plastered should be wetted thoroughly.
Excessive projections extending from the surface should be knocked off and screeds formed, so as to act as thickness gauges. Mud plaster is now applied between screeds by dashing the mortar against the prepared surface.
Mud plaster is usually done in two coats. The second coat is applied after first coat has set but not fully dried. Usually, the thickness of the first coat is 13 mm and the thickness of the second coat is 6 to 7 mm. The mud plaster may finally be swept with a mixture of clay and cow dung.
This plaster gives a smooth and decorative look to the mud walls. Some design may be created over the wall through mud plastering. This types of plaster are environment friendly and less toxic than other types of plaster. The repairing work is also very easy and inexpensive.