Prevention of dampness Use of damp proofing courses or membranes- These are the layers or membranes of water repellent material such as bituminous felts, mastic asphalts, plastic sheets, cement concrete, mortar, metal sheets which are interposed in the building structure at all location wherever water entry is anticipated. These damp proof courses of suitable materials should be provided at appropriate location for their effective use. Basically D.P.C is provided to prevent the water rising from the sub soil and getting into the different part of the buildings. The best location for D.P.C in case of buildings without basement lies at the plinth level or in case of structure without plinth should be laid at least 15 cm above the ground. These damp proof courses may be provide horizontally or vertically in floors, walls etc. in case of basement laying of D.P.C is known as tanking. While providing damp-proof courses in buildings, the following general principles should be observed in practice. • The DPC should cover the full thickness of the walls excluding rendering, in order to act as an effective barrier to moisture under all conditions. • The mortar bed upon which the DPC is laid should be level, even and free from any projections. • The DPC course should be placed in correct relation with other DPC courses so as to provide a complete course should be placed in correct relation with other DPC courses so as to provide a complete and continuous barrrier to the passage of moisture from below, top or sides. Therefore, the junctions and corners, formed by walls, or walls and floors, should be laid continuous. • Where a vertical DPC is to be laid continuous with a horizontal DPC(i.e., forming angle projection), a fillet 75mm in radidius should be provided. the DPC should not be exposed on the wall surface, otherwise it is likely to be damaged by carpainters, tile layers,etc. - Study24x7
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Prevention of dampness Use of damp proofing courses or membranes- These are the layers or membranes of water repellent material such as bituminous felts, mastic asphalts, plastic sheets, cement concrete, mortar, metal sheets which are interposed in the building structure at all l...

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