S1-S2 BT

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

14. THANK YOU