Plaster on Brick Surfaces: This work shall consist of 12 mm to 20 mm thick cement sand plaster on brick walls.
Plaster on RCC Surfaces: This work shall consist of 6 mm to 12 mm thick cement sand plasters of cement sand ratio 1:4 on RCC members.
Cement and sand (FM>1.2) shall be mixed dry in the specified proportion until the mixture is uniform in colour. Only enough water shall be added to provide plasticity. Mortar shall be mixed only in quantities for immediate use. Mortar which has taken initial set shall not be used on the work with or without addition of fresh material.
Before application of plaster, the joints in brick walls shall be adequately raked out where necessary and smooth concrete surfaces shall be roughened to provide key. The surfaces shall be scrubbed clean of loose materials and soaked with water and kept damped for 24 hours in case of brick masonry.
Plaster which consists of two coats, under and finish, when applied over brick masonry, finish coats shall be applied with an interval to permit the undercoat to set. Water proofing admixture of specified quantity shall be mixed with cement mortar as per manufacturer’s instruction.
Plaster shall be kept moist by watering and protected from weather for at least 10 days immediately following completion.
If any cracks appear in the plaster or any part sounds hollow when tapped or is found to be soft or otherwise defective after the plaster has dried, it will be considered as defective and the defective part shall be made good by cutting out and re-plastering.
Groove in Plaster of outside Wall: This work shall be done on the outer surface of wall for architectural purpose. Size of groove shall be 38mm width and 6 mm deep.