A continuous layer of hot applied coal-tar pitch or soft bitumen is poured on the surface and spread to a thickness of not Less than 3 mm. In dry weather a concrete blinding layer is ready for the membrane 3 days after placing. The surface of the concrete should be brushed to remove dust and primed with a solution of coal-tar pitch or bitumen solution or emulsion. The pitch is heated to 35°C to 45°C and bitumen to 50°C to 55°C.
Properly applied pitch or bitumen layers serve as an effective damp-proof membrane both horizontally and spread up inside wall faces to unite with dpes in walls and require less patient application than plastic sheet materials.
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The method of using hot-applied coal-tar pitch or soft bitumen as a damp-proof membrane offers a strong and reliable barrier against moisture. By ensuring the correct temperature for heating the pitch or bitumen, the application process guarantees a seamless, uniform layer that bonds effectively with concrete surfaces. The flexibility of this membrane, both horizontally and vertically along wall faces, ensures comprehensive protection, especially when integrated with the damp-proof courses (DPC) in walls. One advantage of using bitumen over plastic sheet materials is that it requires less precision in application, making it more efficient in certain situations. However, it’s important to ensure that the surface is adequately prepped—such as by removing dust and priming with the correct solution—so that the membrane bonds securely and performs optimally.
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