37/EEC/BSNL/CD/BGL/2023-2024

Amount

Providing and laying APP (Atactic Polypropylene Polymer) modified prefabricated five layer 3 mm thick water proofing membrane, black finished reinforced with non-woven polyester matt consisting of a coat of bitumen primer for bitumen membrane @ 0.40 litre/sqm by the same membrane manufacture of density at 25°C, 0.87-0.89 kg/ litre and viscocity 70-160 cps. Over the primer coat the layer of membrane shall be laid using Butane Torch and sealing all joints etc, and preparing the surface complete. The vital physical and chemical parameters of the membrane shall be as under : Joint strength in longitudinal and transverse direction at 23°C as 650/ 450N/ 5cm. Tear strength in longitudinal and transverse direction as 300/250N. Softening point of membrane not less than 150°C. Cold flexibility shall be up to -2°C when tested in accordance with ASTM, D - 5147. The laying of membrane shall be got done through the authorised applicator of the manufacturer of membrane. NOTE: Guarantee bond for a period of Five years has to be submitted.

3 mm thick

Disconnecting damaged overhead/ terrace PVC water storage tank of any size from water supply line and removing from the terrace including shifting at ground level as per direction of Engineer-in- charge.

Reconnecting overhead/ terrace PVC water storage tank of any size to water supply pipe line ensuring installation in proper level above pedestal including fixing extension nipple etc. for all lift and leads as per direction of Engineer-in- charge. (Note: new extension nipple shall be paid for separately)

Providing and laying cement concrete in retaining walls, return walls, walls (any thickness) including attached pilasters, columns, piers, abutments, pillars, posts, struts, buttresses, string or lacing courses, parapets, coping, bed blocks, anchor blocks, plain window sills, fillets, sunken floor, etc., up to floor five level, excluding the cost of centering, shuttering and finishing :

1:3:6 (1 cement : 3 coarse sand derived from natural sources : 6 graded stone aggregate 20 mm nominal size derived from natural sources).

Removal of tree/weed stem growth below OH tank base up to fifth floor level cutting branches/stems with hand saw/axe etc. including extracting roots with chisel, screw drivers, mechanical drills etc. plugging gap with cement mortar, disposal of vegetation, debris within 50m lead. (NOTE- scaffolding and dismantling of pipes shall be paid for separately wherever required as per direction of Engineer-in-charge)

Demolishing brick masonry pedestals on terrace slab by mechanical means including stacking of serviceable material and disposal of unserviceable material within 50 metres lead as per direction of Engineer-in-charge.

Up to 450x450x300mm size pedestals in cement mortar

Dismantling 15 to 50 mm dia PVC pipe including stacking of dismantled pipes (within 50 metres lead) as per direction of Engineer-in-Charge.

Internal Work- Exposed on wall