Specialized water proofing works. Water proofing of RO building Terrace (including terrace of head room/ lift room terrace), building’s Front Porch terrace, 2nd Floor Open Terrace region: Providing and laying water proofing treatment on terrace head room/ lift terrace/ part of terrace of buildings where existing brick bat coba is in good condition, which shall include the following steps: (a) Prepare the terrace surface by removing the existing plaster and cement mortar up to the level of brickbat coba and clean the surface with hard wire mesh and wash with water jet to remove dust, oil etc. (b) Apply a neat polymer slurry mix using SBR based polymer compound such as Roff Bond Repair W01, Tepcrete or equivalent conforming to IS 2645 over the surface at 1 litre chemical for 50Kg bag of cement and 20 litres of water or as specified by the manufacturer. (c) Fill the depressions on the surface with polymer modified cement mortar made with Roff bond repair W01 or equivalent confirming to IS 2645, at 10 litre chemical, 125 kg zone II sand and 5- 7 litre water for 50 kgs of cement or as specified by the manufacturer. The large depressions on the surface has to be filled with polymer modified cement concrete 1:2:4 (cement: zone II sand: broken bricks aggregates with nominal size 20mm) using polymer compound of approved make as per manufacturer specifications. About 15-20% of the area may be considered of these applications for the purpose of estimation. (d) Providing & applying fibre mesh with neat cement slurry with 3.0 kg of cement per sq. metre (approx.) complete including curing , material, labour T&P wastages etc. all complete as per specification, drawing and as directed by Engineer in charge. (e) Apply water proofing chemical coating in two layers (longitudinal an lateral directions) at 1 to 1.5mm thickness, using water proofing chemical compound of approved make such as Epoxy Coating of atul or dr Fixit make or equivalent as per manufacturer specification. Curing must be done only by placing a wet hessian at least up to 72 hrs after drying and thereafter by proper curing with water as specified by the manufacturer. The prepared surface should be wetted with water to achieve a saturated surface by drying condition before application of coating. The terrace so prepared shall be flooded with water for 7 days for testing. (f) supply & applying of two or more coats of PU coating of approved make for UV protection coating using other materials as per the approved make instruction of applying the...
