COST AFFECTING PARAMETERS IN EXTERNAL PLASTER

VALUE ADDED PARAMETERS / COST AFFECTING PARAMETERS IN EXTERNAL PLASTER

  

1)     Pure sand bags or equivalent can be used in place of river sand. It has advantages over river sand such as weigh batching and volume batching can be done as required. Also graded sand will give less wastage and easy storage & stacking can be done as required. The mix proportion with graded sand recommended by manufacturer is (1:6) which is cost effective as compared with river sand.

2)    Cement mortar in river sand is highly recommended to be used for the first coat (1:6) and richer mortars for second coat (1:4).

3)    The cement mortar mix used in plastering of duct (wall having plumbing/drainage pipe lines) should be (1:4) for first coat as well as second coat and water proofing admixture is highly
recommended for the same.

4)    Fibers are preferred to be used in first coat to reduce the rebound losses, shrinkage and prevent development of crack formation over plastered surface.

5)     Water proofing compounds used in plaster works will reduce permeability and give waterproof coat over plaster surface. It is very essential especially in case of dead walls and long walls with lesser openings.

6)    Liquid polymer modified mortar can be used for plasters. It has added advantages such as enhanced cohesion & adhesion, water repellency and strength. It reduces the rebound loss and increase the rate of application of  the plaster. It reduces the requirement of water for curing. It also reduces the time the application of external plaster if second coat applied as soon as the first coat set. That means both the coats can be done in same day and cured simultaneously.

7)     It is recommended to use bonding agent to all joints of plasters (horizontal or vertical) to avoid leakages through joints in future.

8)     Sponge finish plasters are cost effective but uniformity in texture will not be maintained where as gudgudi coat finish over plaster is comparatively costly but it gives uniformity in texture and has better resistance to weathering effect.

9)     It is recommended to carry out external plastering before internal plastering to prevent rapid drying and shrinkage of internal plastered surfaces.

It is essential to provide curtain cloths (hessian cloth curtain or plastic sheets curtain) on external sides to prevent rapid drying of plastered surfaces due to wind and sunlight