GAIL (India) Limited

52The tiles shall generally conform to latest IS standards shall be procured by the contractor. They shall beflat, true to shape and free from cracks, crazing spots, chipped edges and corners. The glazing shall be ofuniform shade and color shall be as shown in the drawings.The tiles shall be of specified size and thickness as per drawing. The tolerance on facial dimension valueshall be +/- 1.0mm and +/- 0.5 mm in thickness.The top surface of the tiles shall be glazed. The glazed shall be either glossy or matt as specified. Theunderside of the tiles shall be completely free glazed in order that the tile may adhere properly to the base.Type edges of the tiles shall be preferably free form glaze, however, and glazed if unavoidable, shall bepermissible on any one edge of the tile.10.1.2. LAYINGThe Vitrified tiles shall be laid over ferrow cement slab & it shall be cleaned, wetted Mortar of specifiedmix shall be spread to required thickness over a small area. The slab, washed clean, shall be laid on themortar, pissed tapped, with a wooden mallet, and brought to required level The tiles shall be laid as perthe pattern shown on the drawings or as approved by Consultant / Engineer-in-charge.It shall then be removed and laid a side. The top of the mortar shall then by corrected by adding freshmortar at hollows. The mortar is then allowed to harden and cement slurry of paste like consistency shallbe spread over the same at the rate of 1 bag per sq mt. area. The edges of the tile already laid shall bebuttered with slurry of cement and pigment to match the shade of slabs. The tile to be laid shall then beplaced back in position, pressed and properly bedded in level with adjoining tiles with as fine a joint aspossible. Other tiles are also laid in similar manner to correct levels with fine joints. The surplus slurry onthe surface shall be cleaned off.The tiles shall be soaked in water, washed clean, and a coat of cement slurry applied liberally at the backof tiles and set in the bedding mortar. The tiles shall be tamped and corrected to proper plans and lines.The tiles shall be set in required pattern and butt jointed. The joints shall be as fine as possible. Where fullsize tiles cannot be fixed these shall be cut to the required size and their edges rubbed smooth.10.1.3 CURING AND FINISHINGThe joints shall be cleaned off of the grey cement grout with soft wire brush or trowel to a depth of 2mmto 3mm and all dust and loose mortar removed Joints shall then be flush pointed with white cement addedwith pigment if required to match the color of tiles. The surface shall then be kept wet for 7 days.After curing, the surface shall be washed and finished clean. The finished work shall not sound hollowwhen tapped with wooden mallet.11 WATER-PROOFING FOR ROOFThe waterproofing shall be integral cement based water proofing treatmentincluding preparation of surface as required for treatment of roofs, balconies,terraces etc. consisting of following operations:a) Applying and grouting a slurry coat of neat cement using 2.75 kg/sqm.of cement admixed with proprietary water proofing compoundconforming to IS : 2645 over the RCC slab including cleaning the surfacebefore treatment.b) Laying cement concrete using broken bricks/brick bats 25mm to 100mmsize with 50% of cement mortar 1:5 (1 cement: 5 coarse sand) admixedwith proprietary water proofing compound conforming to IS: 2645 over20mm thick layer of cement mortar of mix 1:5 (1 cement: 5 coarse sand)