tender for providing and fixing precoated galvanised iron profile sheets on gis building of chamera-ii power station, karian.; 1 dismantling roofing including ridges, hips, valleys and gutters etc., and stacking the material within 50 metres lead of: g.s. sheet 2 providing and fixing precoated galvanised iron profile sheets (size, shape and pitch of corrugation as approved by engineer-in-charge) 0.50 mm (+ 0.05 %) total coated thickness with zinc coating 120 grams per sqmas per is: 277, in 240 mpa steel grade, 5-7 microns epoxy primer on both side of the sheet and polyester top coat 15-18 microns. sheet should have protective guard film of 25 microns minimum to avoid scratches during transportation and should be supplied in single length upto 12 metre or as desired by engineer-in-charge.the sheet shall be fixed using self drilling /self tapping screws of size (5.5x 55 mm) with epdm seal, complete upto any pitch in horizontal/ vertical or curved surfaces, excluding the cost of purlins, rafters and trusses and including cutting to size and shape wherever required. 3 providing and fixing precoated galvanised steel sheet roofing accessories 0.50 mm (+0.05%) total coated thickness, zinc coating 120 grams per sqm as per is:277, in 240 mpa steel grade, 5-7 microns epoxy primer on both side of the sheet and polyester top coat 15-18 microns using self drilling/ self tapping screwscomplete :ridges plain (500 - 600mm) 4 providing and fixing precoated galvanised steel sheet roofing accessories 0.50 mm (+0.05%) total coated thickness, zinc coating 120 grams per sqm as per is: 277, in 240 mpa steel grade, 5-7 microns epoxy primer on both side of the sheet and polyester top coat 15-18 microns using self drilling/ self tapping screws complete :gutter (600 mm over all girth) 5 dismantling aluminium/ gypsum partitions, doors, windows, fixed glazing and false ceiling including disposal ofunserviceable material and stacking of serviceable material with in 50 meters lead as directed by engineer-in-charge. 6 12.5 mm thick fully perforated gypsum board tile made from plasterboard having glass fibre conforming to is: 2095 part i, of size 595x595 mm, having perforation of 9.7x9.7 mm at 19.4 mm c/c with center borders of 48 mm and the side borders of 30 mm, backed with non woven tissue on the back side, having an nrc ( noise reduction coefficient) of 0.79, with 50mm resin bonded glass woolacking.(excluding cost of