Providing and spray applying two component hybrid polyuria polyurethane waterproofing system at all levels for podium garden waterproofing by the manufactuer or his approved applicator consisting of following operations - a) Brushing and Vacuum cleaning the surface to make free from any loose material, oil, grease, burr, dirt, dust etc. b) Reparing the surface if required, as per recommendation of manufactuer or his approved applicator to make it water tight for which nothing extra shalll be paid. c) Providing and applying by spray or brush, two component solvent free resin / epoxy primer mixed in proportion by volume / weight as recommended by manufacturer over cement concrete surface in dry condition, having consumption varies from 0.20 to 0.40 kg/sqm depending on the porosity and undulations in the surface. d) Providing and sprinkling washed coarse sand, as recommended by manufacturer, over freshly laid primed tacky surface @ 0.25 to 0.40 kg/sqm as directed by the Engineer-in-Charge. e) Over primed sandy surface, providing and spray applying two component hyrbrid polyurea polyurethane coating system, which shall be solvent free, mixed in proportion by volume / by weight as recommended by the manufacturer having elongation >400%, Shore A Hardness > 75 (after 28 days), tensile strength of minimum of 10 MPa as per DIN /ASTM and Tear strength minimum 30N/mm as per DIN 53515 or minimum 45 N/mm as per ASTM D624 and 20 second maximmum gel time / reaction time with minimum 1.5 mm dry film thickness of two coats. f) A layer of non woven polypropylene geotextile of minimum mass / unit area of 120 gsm with an overlap of 50 mm shall be laid over the polyurea/polyurethane coating surface, having minimum tensile strength 2.40 KN/m as per ASTM D 4595. g) Providing and laying screed of cement concrete 1:1.5:3 (1 Cement : 1.5 Corase sand : 3 graded stone aggregate 20mm nominal size) of minimum thickness 50 mm at Khurra with a slope of 1:100 towards Khurra to ridge of roof (Screed shall be paid for separately). h) Providing and laying Dimple drain boards with inbuilt geo textile drainage membrane on top having dimple height of 20-25 mm, average number of dimples 400 per sqm, compressive strength not less than 180 kN/m2 and geotextile drainage member having mass of 120 gsm, laid with minimum overlap of 50 mm Note : If HDPE Drain cells / Drainmats along with a layer of geotextile having weight of 120 gsm and tensile strength not less than 2.4 kN/m as per ASTM D 4595 is provided in place of dimple drain board with inbuilt geotextile, it shall not be paid as extra.
22.27.1New Work on Horizontal Surfaces
Matches DSR 2023