e-tender for 2nd call for special roof treatment of the roof of block-c within the b t line complex at 29/1 bt road, kolkata-700002, during the year 2024-2025-- 1 2nd call for special roof treatment of the roof of block-c within the b t line complex at 29/1 bt road, kolkata-700002, during the year 2024-2025 2 dismantling all types of plain cement concrete works, stacking serviceable materials at site and removing rubbish as directed within a lead of 75 m. 3 stripping off worn out plaster and raking out joints of walls, celings etc. upto any height and in any floor including removing rubbish within a lead of 75m as directed. 4 applying 2 coats of bonding agent with synthetic multi functional rubber emulsion having adhesive and water proofing properties by mixing with water in proportion (1 bonding agent : 4 water : 6 cement) as per manufacturers specification [cement to be supplied by the department] 5 plaster (to wall, floor, ceiling etc.) with sand and cement mortar including round off or chamfering corners as directed and raking out joints including throating, nosing and drip course, scaffolding/stagingwhere necessary (ground floor).[excluding cost of chipping over concrete surface](iii) with 1:6 cement mortar(b) 20mm thick plaster gr floor 6 preparation of drainage spout on roof for bituminous waterproofing treatment after required grading and shaping of the under bed with cement concrete (1:2:4) or cement 7 ordinary cement concrete (mix 1:2:4) with graded stone chips (20 mmbnominal size) excluding shuttering and reinforcement if any, in ground floorbas per relevant is codes. 8 cutting chase upto 125 x 150 mm. and subsequent mending of damages.(a) in brick wall [cement-3.6 kg/mtr] 9 supplying & laying 3mm thick pre-fabricated plastomeric water proofing membrane conforming to en 12311-1 & astmd 5147, manufactured with atactic poly propylene (app) modified premium grade asphalt , specially reinforced with non-woven polyester core with polyester reinforcement @160 gms per sqm & both faces covered with thermo-fusible polyethylene film /mineral on top face over a coat of primer @ 0.40 lit/sqm of manufacturers specification on smooth,clean dry surface prepared wherever required.lap joint shall be provided of 75 mm in longitudinal & 100 mm in transverse direction and fused using lpg/ propane torch employing extra care ensuring full bondage, complete removal of entrapped air and sealing edges into grooves in appropriate manner as per direction of engineer -in-charge all complete including materials,labour and applicable taxes. (payment shall be made on the basis of finished surface area.). membrane property: softening point > 150 deg c, cold flexibility < -6 deg c, tensile strength, n/cm : 600 (longitudinal), 450 (transverse), tearing strength, n: 300 (longitudinal), 200 (transverse)