Name of Work: Water Proofing Roof Treatment of Power House at Dhyangarh
Sl. No.
Item Description
1
Dismantling old plaster or skirting raking out joints and cleaning the surface for plaster including disposal of rubbish to the dumping ground within 50 metres lead.( incl. Removal of old APP sheet )
2
Grading roof for water proofing treatment with Cement mortar 1:4 (1cement : 4 Coarse sand)
3
Providing and filling in position, blown bitumen in expansion joints
4
Providing and laying APP (Atactic Poly Propylene Polymer ) modified prefabricated five layer water proofing membrane, black finishing reinforced with glass fibre mat consisting of a coat of bitumen primer for bitumen membrane @ 0.40 ltr/sq. mt. by the same membrane manufacture of density at 25°C, 0.87- 0.89 kg/ltr and viscosity 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: Softening point of membrane not less than 150°C. Cold flexibility shall be upto -2°C when tested in accordance with ASTM, D - 5147. The laying of membrane shall be got done through the authorized applicator of the manufacture of membrane -3 mm thick water proofing membrane with nonwoven polyester matt: Joint strength in longitudinal and transverse direction at 23°C as650/450 N/ 5cm. Tear strength in longitudinal and transverse direction as 300/250N.
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