PLASTERING

PLASTERING :-

Definition:---

                  plastering is the process of covering rough surfaces of walls, columns,ceilings and other building components with thin coat of plastic mortors to form a smooth durable surface . The coating of plastic material is termed as plaster.

       sometimes the term rendering is used instead of plastering. plastering is applied to the  external surface of walls  either to improve the apperance or to protect them from weather agencies,such as rain,heat,etc.

Requirements of good plaster:-

the following are requirement :

  • the plaster should provide a smooth , non - absorbent and washable surface.
  • it should be hard and durable.
  • It should be possible to apply it during all weather conditions.
  • it should be cheap and economical.
  • it should effectively check penetration of moisture.
  • it should offer good insultation against sound and high resistence against fire.

​why we should do plastering:

          we should do plastering because of the following reasons:

  1. To protect the external surface against penetration of rain water and other atmospheric agencies.
  2. To protect an even , smooth , clean and surable finished surface.
  3. To cover up the use of inferior quality and porous materials and the joints formed in masonry work.
  4. To conceal the defective workmanship.
  5. to provide a satisfactory base or ground for decorating the surface by applying white-washing, colour-washing.

​TYPES OF PLASTER FINISHES

            The external walls of the building are finished with suitable materials for one or more purposes.

      Plastered surface may be finished in the folllowing varieties:

  1. smooth cast finish
  2. Sand faced
  3. Rough cast 
  4. Pebble dash 
  5. Depeter
  6. Scrapped
  7. Textured finish

TOOLS FOR PLASTERING:-

    The following are tools commonly used for plastering work:

Gauging  Trowel

       this is the ordinary trowel used for gauging small quantities of materials for other tools and for applying plasters to moulding, corners, etc.

  it has a pointed or bull-nosed end.

PLUMB BOB

       This tool is useful in forming screeds in the same vertical plane.

Floating rule

        it is used for checking the level of plastered surface between successive screeds.

Miscellaneous tools

        In addition to the above tools such as brushes , spirit level,set sqares,etc.are used for the plastering work.

METHODS OF PLASTERING:-

  • Preparation of surface for plastering 
  • two coat plaster

REMEDIES FOR MINIMIZING THE DEFECTS IN PLASTERING WORK:-

  1. ​The excessive trowelling should be avoided.
  2. The overall construction should be such that the penetration of moisture is prevented.
  3. The bricks of superior nature should only be used.
  4. The bond of brickwork should be properly maintained.
  5. The surface of the plaster should be well- watered so that it may not absorb water from the plaster.

COMMON DEFECTS IN PLASTER

Following arte the common defects inplasters:

  • surfaces not being prepared properly before plastering.
  • Due to thermal expansion of wall.
  • poor workmanship.
  • structural defects in building.
  • Due to improper curing.
  • Exessive moisture in the background .

Posted on by
Score
Views