Water proofing in OPD Block (2500 Sq mtr) M.C. Ambala City (Under D Plan 2026-27)(Only for L/C Societies)

MR of Terrace WP roviding and applying elastomeric, PU coating water proofing and insulation system to be applied at required consumption to achieve a minimum 1.5mm DFT with required coat (minimum 2 coat) uniformly spread in entire area. System shall be executed as follows: 1)Surface preparation shall be done as per manufacturer specifications followed by single component PU water proofing coating 2)Repairing cracks on mother roof slab by cutting and making V grooves in 25x25 mm, and filling with a polymer modified sand-cementitious mortar using Webertec SBR Litx , of 1:3 proportion and filling the groove with CM (1:3) as recommended by manufacturer specification. 3)Making fillet and haunches with polymer modified mortar using Webertec SBR Litx or as per manufacturer of minimum size 50mm x 50mm 4)Supplying and applying a base coat of single component polyurethane based waterproofing coating, having elongation ) 600%, crack bridging= 2 mm, tensile strength of ) 4.0 Mpa, watervapour permability )30 gm /sqm per day, minimum DFT 1.5mm (as per ASTM D 412),shore hardness 65 on a surface prime with 2 component water thinable 2 component epoxy primer at the corners above the mother slab of roof and over the concrete haunches provided in the periphery of the slab at the junctions of the parapet wall or 450mm 5) Spray applying an average 80 mm thick polyurethane foam (CFC and HCFC free), with a core density of 45-50 kg /m3, thermal conductivity of 0.023 W/m.k at 25°C mean temperature (as per ASTM C518/91), tensile strength of ) 300kPa (as per ASTM D 1623), compressive strength with rise of )300kPa (as per ASTM D-1621), closed cell content having apparent vol of ) 90% (as per ASTM D 6226/ 2856) and fire resistance property conforming to Class B2 as per DIN 4102. 6)Application of PU form shall be followed by, supplying and applying a base coat of one component polyurethane based waterproofing coating Weberdry PUR Basic, having elongation of ) 600% and tensile strength of ) 4 MPa, with minimum DFT 1.5mm (as per ASTM D 412), over a PU foam and vertical above upto 450mm. 7)Supplying and laying 300 gsm Geotextile (non woven polyester) over the entire membrane maintaining proper overlaps of 100 mm and above vertical as per manufacturer`s specification. 8)Applying average 100 mm thick M25 grade concrete screed including providing control joints in 3M X 4M grids size, and providing the angular haunch of 50mm X 50mm using M25 grade concrete at the corners of the slab-parapet wall junctions all around the periphery. Screed concrete shall be cut by mechanical means and filling the groove with a one component Polyurethane Sealant that is moisture triggered and cast immediately on saw cutting joints on green concrete. The width of sealant fill shall not exceed 10mm. (Screed as per above description shall be paid separately). Providing and applying UV resistant, a spray/ roller applied solar reflective cum waterproof coating Weberdry PUR Coat for terrace area with elastomeric property and having a SRI value not less than 90 (as per ASTM E 1980), with crack bridging ability up to 1mm (as per ASTM C 836: 1995) and elongation at break of 250 % (as per ASTM D 412 : 2002), having tensile strength= 2.0 Mpa with a coverage of 400 gm/sqm in 2 coats.Make: Weber, Kerakoll, Mapei T3