State any four precautions to be taken while plastering.

State any four precautions to be taken while plastering.
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Answer :

i. Before application of the plastering, the surface must be clean and free of dirt, oil, or other elements which may interfere with bonding. ii. Smooth or non-absorbent surfaces should be prepared. iii. It is strongly recommended that the surfaces be dampened with clean water prior to applying the plastering for improved performance in adhesion, durability, and reduced cracking. iv. Sand used must be sieved and washed. v. The material used in preparation of plastering mixes must be measured by volume using gauge-boxes or by weight. vi. Chicken mesh of 20 gauges as approved shall be used over junctions of concrete and masonry or two dissimilar materials. vii. Raking out of joints is expected to be carried out along with masonry but it should be checked thoroughly so as to receive good key. viii. The method of application is also important and hence it is recommended that the mix be thrown on the surface rather than stuck with trowel. This increases the adhesion. ix. Scaffolding should be rigid, allowing free and safe movement on the platform and it should be at sufficient distance or height from the working areas. Scaffolding shall be with proper railings. x. Corners, external or internal, shall be finished along with final coat. It is advisable to have rounded corners. xi. Finishing of plaster may be carried out with wooden float (randhas) or trowelled smooth with sheet metal trowels as specified. Care shall be taken to avoid excessive trowelling and overworking of the wooden float. xii. Plaster shall be cut to correct horizontal or vertical line at the end of the day or if work requires to be suspended for any reason.
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