(I) WATERPROOFING - PDF document

(I) WATERPROOFING LIST OF BUREAU OF INDIAN STANDARD CODE OF PRACTICE (ISI): 3067 : Code of practice for general design, details and preparatory work for damp proofing and waterproofing of buildings. GENERAL: The waterproofing work shall be carried out by Contractors who have experience in doing waterproofing work and shall give a guarantee on a stamped paper for good performance of the waterproof treatment for a minimum of ten years period and shall, at their own cost, rectify the defects, if any, found during the guarantee period. Surface preparation: Concrete and masonry surface Any cracks in the surface (other than hair cracks) shall be cut to V-shape, cleaned and filled with cement mortar 1:2 or with bitumen conforming to IS:702 as directed by the Engineer. All fungus growth, if any, moss, dust shall be removed by wire brushing. Masonry drain mouth shall be widened to two and a half times the diameter of the drain and rounded with cement mortar. When a pipe passes through RCC slab a cement concrete fillet shall be built around the pipe and waterproofing taken over the fillet. 1.0 CEMENT BASED WATERPROOFING TREATMENT WITH BRICK BAT COBA: In general the waterproofing shall be carried out as per specification of the specialist but duly approved by the Engineer. The roof surface before waterproofing shall be cleaned thoroughly and watered and shall be kept wet at least 12 hours prior to carrying out of waterproofing. If any leakage is observed the source of leakage shall be located and it shall be treated either by injection grouting or by closing of the crack with application of cement mortar 1:2 after cutting a V-shape groove. The treatment shall be continued till the leakage is stopped. Brick piece of quarter half, and three quarter size are laid piece by piece in the form of horizontal brick masonry in waterproof mortar with waterproofing compound made up of cement and sand (1:5) and waterproof powder. The treatment is carried out layer by layer to make up the desired thickness to achieve the desired slope as specified in the drawing and as directed. The brick bat coba is finally covered with jointless waterproofing plaster with waterproofing compound finished smooth with trowel in cement colour, with false markings of 300mm squares. The treatment is carried along the vertical surface of the parapets and other adjoining walls, upto a height of minimum 300mm in the shape of round wata. The average thickness of treatment is about 125mm the minimum 2.0 DAMP ROOF COURSE: The work to be carried out as specified in Bd.J.2 of PWD standard specifications and will be measured on square metre basis. 3.0 WATERPROOFING OF BATHROOM, TOILETS AND KITCHEN SUNK ETC. The treatment shall be done by the following method. But before the work in the floor and wall is done, all chasing or cutting in the floor and/or wall shall be done by the plumber. A layer of waterproofing plaster in C.M. 1:3 waterproofing compound of minimum 35mm thick in the floor area of the depression and minimum 25mm thick on the side walls of the depression upto floor level shall be laid and finished smooth and hard by trowelling. The waterproof plaster in C.M. 1:3 with waterproofing compound of minimum 20mm thick shall then be continued on the walls above the proposed finished floor level upto a minimum height of 600mm with surface and even to receive tiles to be laid by the contractor. In shower area in the bathrooms, the treatment shall be for the full height of the wall. The plumber shall then finish all his plumbing work i.e. of laying and fixing of pans, pipes and traps etc. without and further breaking or disturbing the treatment. The depression shall then be filled with waterproofing brickbat caba in C.M. 1:4 with waterproofing compound upto the level for putting tiles, the surface being finished even and suitable in 1:15 slope with C.M. 1:3 with waterproofing compound to receive tiles to be laid by the contractor. MODE OF MEASUREMENT;