What is Plastering | Types, Requirement & Properties
Plastering
- Method of covering rough surfaces with each plastic material to obtain equal vein, smooth, regular, clean also durable surface.
- The coating of plastic material i.e. mortar is called plaster.
- Plastering on externally exposed surfaces is called rendering.
- That is made up of cement, lime clay, fine aggregates, and sand, including water.
- If cement is applied as specific binding material, the plaster is termed as cement plaster including when lime is applied as the binding material, it is known as lime plaster.
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An object of plastering
- To protect external surfaces
- To give smooth, clean surfaces
- Prevent entry of dust into the joint
- To provide a decorative effect
- Prevent defective workmanship
A requirement of good plaster
- It should be Hard & durable
- It should Cheap
- Desirable to apply during every weather condition
- Effectively resist the penetration of moisture
- Should remain strong during all variations in seasons.
Types of plaster finishes
- Smooth cast finish
- Sand face finish
- Roughcast finish or spatter dash finish
Preparation of surface for plastering
- The surface should be uniform.
- The durability of plaster depends upon the bonds with a background wall.
- Group the projections which extend by more extra than 15 mm. from the masonry wall face are knocked off.
- Dust and loose mortar are brushed out of the raked joints.
- The surface should be free from oil & greasy spots.
- Efflorescence is removed by brushing and scraping.
- In the case of old walls, the smoothness of the surface is destroyed.
- kept the wall wet before plastering is started
Types in plastering
- Cracking
- Blistering of plaster
- Crazing
- Efflorescence
- Flaking
- Peeling
- Popping
- Uneven surface
Cracking
- Thermal expansion or shrinkage or drying of material, there can appear cracking in the structure.
- Due to bad Workmanship and the method of application of the mortar, there can appear cracking in the structure.
- If the Old surface not being properly prepared there can appear cracking in the structure.
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Blistering of plaster
- Formation of small patches of plaster swelling, due to improper slaking of lime particles in the plaster.
![What is Plastering | Types, Requirement & Properties 2024 Plastering, object of plastering, A requirement of good plaster, Types of plaster finishes, Preparation of surface for plastering, Types in plastering,](http://www.ishwaranand.com/wp-content/uploads/2020/02/57.webp)
Crazing
- Formation of a series of hair cracks on the plaster surface.
![What is Plastering | Types, Requirement & Properties 2024 Plastering, object of plastering, A requirement of good plaster, Types of plaster finishes, Preparation of surface for plastering, Types in plastering,](http://www.ishwaranand.com/wp-content/uploads/2020/02/58.webp)
Efflorescence
- An efflorescence toward the surface is unlikely to cause real damage to the brick unless a quantity of water-soluble salts is present.
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Flaking
- Formation of a very loose mass of plaster surface due to poor bond.
![What is Plastering | Types, Requirement & Properties 2024 Plastering, object of plastering, A requirement of good plaster, Types of plaster finishes, Preparation of surface for plastering, Types in plastering,](http://www.ishwaranand.com/wp-content/uploads/2020/02/40.webp)
Peeling
- The complete dislocation of some portion of the plaster surface.
![What is Plastering | Types, Requirement & Properties 2024 Plastering, object of plastering, A requirement of good plaster, Types of plaster finishes, Preparation of surface for plastering, Types in plastering,](http://www.ishwaranand.com/wp-content/uploads/2020/02/41.webp)
Popping
- Formation of conical holes.
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