The ratio of cement and sand for first coat plaster varies from 1:3 to 1:6.In case of brick masonry the thickness of first coat plaster is in general12 mm and in case of concrete masonry this thickness varies from 9 to 15 mm.These screeds serve as the gauges for maintaining even thickness of plastering being applied.ĭots and Screeds Step-3 (Applying First Coat or Under Coat or Rendering Coat) After fixing dots, the vertical strips of plaster, known as screeds, are formed in between the dots.Check the verticality of dots, one over the other, by means of plumb-bob.Dots are fixed on the wall first horizontally and then vertically at a distance of about 2 meters covering the entire wall surface.
#CEMENT PLASTER SPECIFICATIONS PATCH#
A dot means patch of plaster of size 15 mm * 15 mm and having thickness of about 10 mm. In order to get uniform thickness of plastering throughout the wall surface, first fix dots on the wall.Wash the mortar joints and entire wall to be plastered, and keep it wet for at least 6 hours before applying cement plaster.Roughen the entire wall to be plastered.If there exist any cavities or holes on the surface, then fill it in advance with appropriate material.This will reduce the consumption of plaster. If the projection on the wall surface is more than 12 mm, then knock it off, so as to obtain a uniform surface of wall.If the surface is smooth or the wall to be plastered is old one, then rake out the mortar joint to a depth of at least 12 mm to give a better bonding to the plaster.Clean all the joints and surfaces of the wall with a wire brush, there should be no oil or grease etc.Keep all the mortar joints of wall rough, so as to give a good bonding to hold plaster.Step by Step Guide for Cement Plastering Step-1 (Preparation of Surface for Plastering)
Step-1-Preparation of surface for plastering.The process of applying a double coat cement plaster on wall surface consists of the following 5 steps. Double coat plaster is applied where thickness of plaster is required to be more than 15 mm or when it is required to get a very fine finish. Cement plaster is usually applied in a single coat or double coat. Cement plastering is commonly used as ideal coating for external and internal surface of wall.
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