![]() ![]() ![]() 150 mm wide, or of an approved expanded metal with galvanized or stainless-steel nails and washers or galvanized or stainless-steel staples or similar. mesh (10 to 15 mm hexagonal mesh), min.Reinforcement shall consist of a strip of approved galvanized or stainless-steel wire.This shall apply where walls join stiffeners, concrete frames, etc., meet and where cracks are likely to develop, and/or wherever directed by the Employer/ Engineer. Joints between differing materials (other than the main reinforced concrete members and the block walls) shall be reinforced.Concrete surfaces have to be roughened prior to plastering and – like any other surface as directed by the Employer/ Engineer shall be treated with an approved bonding agent to provide an adequate key and bond. Mortar joints in block and brickwork must be racked out to a depth of at least 15mm.An approved plasticizer may be used in both coats. The second coat shall be finished to a smooth hard and dense surface, which is truly flat and vertical.Immediately before application of the second coat, the surface of the first coat shall be thoroughly wetted again.The second coat shall not be applied until the first coat has dried out completely.Surfaces shall be wetted before the application of the first coat, which shall be finished flat and vertical by a straight edge and scored to form a key. Plastering shall normally be applied in two coats.All surfaces to be plastered shall first be dashed with a mixture of Portland Cement and Sand (450 kg cement: 1 m3 sand) to form a key.Screed marks or making good on undercoats shall not show through the finishing coats.Surfaces of undercoats shall be well prepared and cleaned to provide a good key for subsequent and/or finishing coats.Electrical wires and boards should be cleaned after plastering works.įor detailed tests of all the material please visit our blogpost “ Ingredients of Concrete & Their Tests“ Detailed procedures of cement plaster.Make sure that the electrical boards and wiring should be sealed under plaster. ![]()
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