PLASTERING
PLASTERING
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
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
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
Types of Plastering
Depending upon the binding material
• Cement Plastering
• Mud Plastering
• Lime Plastering
• Lime cement plaster
• Cement plastering
• Mud plastering
Lime plastering
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
• 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
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)
• Efflorescence- due to soluble salts present in the brick or mortar
• Avoided by washing the surface with zinc sulphate solution and water
• 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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