avoid entry of rain water inside seminar room ats.p. jain centre building, sdc - repairs to plaster of thickness 12 mm to 20 mm in patches of area 2.5 sq.meters and under, including cutting the patch in proper shape, raking out joints and preparing and plastering the surface of the walls complete, including disposal of rubbish to the dumping ground, all complete as per direction of engineer-in-charge.with cement mortar 1:4 ( 1cement: 4 coarse sand ) 3 providingand applying fibre reinforced elastomeric liquid water proofing membrane with resilient acrylic polymers having sun reflectivity index ( sri ) of 105 on top of concrete roof in three coats @10.76 litre / 10 sqm. one coat of self-priming of elastomeric waterproofing liquid ( dilution with water in the ratio of 3:1 ) and two coats of undiluted elastomeric waterproofing liquid ( dry film thickness of complete application / system not less than 500 microns ) . the operation shall be carried out after scrapping and properly cleaning the surface to remove loose particles with wire brushes, complete in all respect as per the direction of engineer-in-charge.