Providing Thermoplastic Polyolefin membrane on roof of Heavy Machine Shop of CDM Building and other structures at North Site, BARC, Trombay, Mumbai.

Amount

Supply and Application of flexible Thermoplastic Polyolefin (TPO) Membrane having minimum thickness of 1.5 mm with Reinforced Fabric (RF) / scrim; which shall be free from plasticizer, chlorine & pthalate and should meet the specifications as per ASTM D6878 and is manufactured using a hot-melt extrusion process for complete scrim (reinforcing fabric) encapsulation. The TPO membrane shall be reinforced with a strong, polyester reinforced fabric (scrim) at the center and a tough thermoplastic polyolefin compounded top ply and the bottom ply of total thickness of 1.5mm. The TPO Membrane shall have white colour top with a very high resistance to weathering agents and UV rays. The TPO membrane shall have the following minimum/maximum properties as per ASTM D6878: (i) Breaking Strength min. 220lbf (976N) (testing as per ASTM D751) (ii) Elongation at reinforcement break: min. 15 % (testing as per ASTM D751) (iii) Tearing Strength: min. 55lbf (245N) (testing as per ASTM D751) (iv) Factory seam strength: min. 66lbf (290N) (testing as per ASTM D751), (v) Brittleness Point of minimum <-40 deg (testing as per ASTM D2137) (vi) Thickness of coating over the fabric or scrim, min. 0.48mm (weathering side only) (vii) Ozone resistance: No crack (testing as per ASTM D1149), (viii) Properties after heat aging (testing as per ASTM D573) (ix) Water absorption: max. 3% by mass (testing as per ASTM D471) and (x) Weather resistance (testing as per ASTM G155). The rate shall include cost of 300 gsm geotextile membrane as cushioning / separation layer between existing bituminous waterproofing layer and the TPO membrane, termination bars with PU/Hybrid sealant high performance glue with good adhesion property and suitable concrete fasteners (coated steel, 3 inch. round, 1-1.5 inch buttress head) and plate washers (26 gauge plate) with PU/ Hybrid Sealant and Aluminium strip (2mmm thick, 25mm wide & 3m long) end terminations. The joints shall be thermo welded with machine welding. The fasteners / screws shall be covered under the overlaps. The whole treated terrace / area shall be flooded with water for a minimum period of 24 hours to test against leakage/seepage (Wherever applicable). Tentative / suggested make for the guidance of bidder(s): M/s Pidilite or equivalent Note: (1) The above work shall include all consumables, adhesives, accessories as approved by approved Manufacturer which are required to complete the work in all respects. (2) The work has to be carried over existing tarfelt waterproofing and appropriate remedial measures as per manufacturers specification shall be taken wherever total debonding of the tarfelt roofing has occurred, repair to substrates wherever required at no additional cost to the Department. (3) The work shall include the cost for all lead and lifts and for working at any location. (4) Wherever TPO membrane is fixed at visible edges/fascia of the elevation of the building, the same shall be executed to proper line and level without any undulations upto the satisfaction of the Engineer-in Charge. (5) Contractor shall submit Manufacturers test certificate and shall also bear the cost of third party tests for all physical and chemical parameters from BARC approved Lab if required by the Engineer-in Charge. (6) Contractor shall follow Method Statement attached alongwith the tender and as per satisfaction of Engineer-in Charge for execution of work. (7) Contractor shall submit a waterproofing Guarantee of 10 years.

Metro glass

CONSTRUCTION SPECIALITY

Shivkrupa Enterprises

S.V ASSOCIATES