Plastering involves covering rough or uneven surfaces with a plastic material to create a smooth finish. It provides protection from weathering, conceals imperfections, and allows for painting or other decorative finishes. There are different types of plaster depending on the binding material used, including cement, mud, lime, and lime cement. Cement plastering typically involves applying multiple thin coats over a period of days to allow drying in between. Proper curing and avoiding excess thickness helps prevent common defects like cracking during the plastering process.

1. PLASTERING

2. Plastering
• Process of covering rough walls and uneven
surfaces of a building with a plastic material to
form a durable surface.
• Additives are added to improve the
adhesiveness, water proof, termite resistance

3. Objectives of plastering
• Provide an even,smooth,regular, clean and durable
finished surface
• Protect the surface from the effects of atmospheric
agencies
• Conceals the defective workmanship
• Covers up the use of inferior quality materials and
joints
• Provides satisfactory base for white washing, color
washing

4. Characteristic of good plastering
• Should be fire resistant and sound proof
• Should provide a smooth, non-absorbent and
washable surface
• Should adhere to the surface firmly
• Should be weather proof
• Should be free from volumetric changes while
setting and drying

5. Types of Plastering
Depending upon the binding material
• Cement Plastering
• Mud Plastering
• Lime Plastering
• Lime cement plaster

6. • Cement plastering

7. • Mud plastering

8. Lime plastering

9. Procedure for cement plastering
• Average thickness of cement plastering is 12-
15mm
• Clean the surface with water and is kept wet till
applying plaster
• Preliminary coat is applied on the surface to fill up
hollow portion of masonry
• First coat is applied with a thickness of 9-10mm

10. • Second coat is applied after 6hrs and thickness of
second coat is 10mm.
• Surface is polished with a trowel
• Third coat if required is applied with maximum
thickness 3mm
• Completed plaster is allowed to rest for 24hrs and
well watered for at least one week
• Slow setting under higher humidity improves the
strength of plaster

11. Defects in Plastering
• Cracks-appears on the
plastered surface in the form
of thin lines or wider cracks
• Due to shrinkage of thick
plaster or poor workmanship
• Prevented by proper curing -
10 days and keeping
thickness of plaster uniform
(<15mm)

12. • Efflorescence- due to soluble salts present
in the brick or mortar
• Avoided by washing the surface with zinc
sulphate solution and water

13. • Falling out of plaster- due to inadequate water
bondage, water absorption by dry wall
• Avoided by proper cleaning of joints and proper
washing of surface of wall

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