Apply 4mm thick SBS modified bituminous membrane type or equivalent water proofing system for external parts of shear and lift core walls. The material shall be approved by the engineer prior to any application.Apply 4mm thick SBS modified bituminous membrane type or equivalent water proofing system for retaining shear walls. The material shall be approved by the engineer prior to any application.The work shall include single brick wall embaded in cement sand mortar of 1:3 ratio, with three coats of cement plastering and applied two coats of hot bitumen asphalt evenly spread on external side of plasteredbrick wall.