Bhabha Atomic Research Centre Tender

Providing Water proofing treatment to the Roof Terrace Over Reinforced Concrete precast slab roofing area using WP SHIELD P4180 4mm thick bitumen based sheet and WP SHIELD SLATED 4mm thick of CERA or equivalent as per specifications at an elevation upto (+)27.50M above the ground level and all locations, as directed by the Engineer in Charge. a) The existing tarfelt waterproofing membranes shall be removed completely without damaging existing structure by cutting and peeling off from the surface and disposing the same from terrace to ground floor for a lead of 100 metre as directed by EIC.(Removing of existing tarfelt will be paid separately.)b) The surface shall be cleaned thoroughly with wire brush and light chisels for making the surface free from existing bitumen primer, dust, other laitance, etc.c) Wherever required Grooves shall be cut along the slab joints (in either direction) and at the visible surface cracks with a cutting machine and after applying a lavish coat of polymer based bonding agent SBR LATEX from CERA or equivalent the same shall be filled with cementitious non• shrink grout polysulphaid Sealant CERAGROUT 40 from CERA or equivalent by injecting method with mechanical injecting machine, 300mm apart and drill 15mm deep with 10mm dia. drill holes nipples wherever leakage area has been identified.d) The area shall be tested for any leakages by ponding water in panels. The area should be got approved by the Engineer-in-charge for free from any leakage before applying the bituminous primer and APP Membrane.e) When the entire surface is water-tight, dry and moisture free, one coat of bituminous primer shall be applied over surface @ 0.3 kg/sqm and 1st layer of 5 - layered, 4mm thick, polymer reinforced APP membrane WP SHIELD P4180 from CERA or equivalent shall be laid with 200mm overlapping by torch - on application when the primed surface is tacky and as per the manufacturer's recommendation.f)The second layer of 5 - layered, 4mm thick, polymer reinforced APP membrane WP SHIELD - SLATED from CERA or equivalent shall be laid with 200mm overlapping by torch - on application when the primed surface is tacky and as per the manufacturer's recommendation shall be laid in perpendicular direction to the first layer. Note: i) The treatment should be done by an agency specialized in the job having sufficient knowledge of water proofing treatment. Suggested vendors : (1) M/s. Cera-Chem Pvt. Ltd., Chemicals (2) M/s. Sika India Pvt. Ltd. Chemicals ii) Ten years guarantee shall be given by the contractor in the prescribed form of the department for the above water proofing treatment work

Providing and laying APP membrane water proofing treatment with CERA WP SHIELD P4180 or other approved equivalent of 4mm thick with sufficient overlaps of 200mm by torch on application including application of bituminous primer over the prepared surface including preparation of surface at an elevation upto (+)27.50M above the ground level and all locations, as directed by the Engineer in Charge

Providing the coating on the floor area by screeding with 1:2:4 screed concrete with 10mm down aggregate admixed with crystalline based integral water proofing admixture CERA CRYSTALLINE INTEGRAL / Conplast / SIKA WT - 215P or equivalent @0.8% by weight of cement to an average thickness of 50mm depending on the downtake pipes available including applying one coat bonding polymer modified mortar 1:2 (1 cement 2 sand ) admixed with CERA LATEX SBR /FOSROC NITO BOND SBR / SIKA additive or equivalent @ 3kg per bag of cement over the prepared surface at an elevation upto (+)27.50M above the ground level and all locations, as directed by the Engineer in Charge.