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Methodology of Waterproofing Treatment
A) Surface Preparation: -
Cleaning the surface from dust, mortar splashes loose materials etc. to get a sound concrete surface. Clean the prepared surface with fresh clean water. All inter-sections between roof slab and vertical walls should be provided with minimum 3 inches concave coving. The coving shall be made of 1:2:4 PCC admixed with integral waterproofing compound IS 2645. Cement slurry admixed with bonding compound shall be used as a bonding agent to ensure effective bonding of coving with roof slab and vertical wall.
B) Waterproofing Treatment: -
Option – I: - Single component polymer coating with fiber mash: -
Surface to be treated with Hydro proof / Tapecrete should be pre-soaked with clean water and should be damp during application. Applying a diluted coat of Hydro proof/ Tapecrete (about 1 Ltr Hydroproof / Tapecrete, 2 Liters water & 4 Kg of cement) should be used as a primer. Providing and fixing fiber mash on the wet coat of primer. Apply two coat of primer on the top of fiber mash. Apply one coat of 1:2 (Hydroproof / Tapecrete: cement) emulsion taking care that the previous coat is touch dry.
Option – II: - APP Membrane Treatment: -
Once the surface becomes dry apply Bitumen Cold primer and allow drying until it is tack free prior to the application of the membrane. The membrane should be unrolled on the primed surface, heating with gas torch to the bituminous side of the membrane. Taking care that the next roll should be overlapped at least 15 cm to the previous membrane. The joints of the membrane should be heated and pressed properly.