tender for repair works in terrace of mugappair east telephone exchange chennai; 1 steel work in built up tubular ( round, square or rectangular hollow tubes etc. ) trusses etc., including cutting, hoisting, fixing in position and applying a priming coat of approved steel primer, including welding and bolted with special shaped washers etc. complete. hot finished welded type tubes 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 gm 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. sheet should have protective guard film of 25 microns minimum to avoid scratches during transportation and should be supplied in single length upto 12metre or as desired by engineer-in-charge. the sheet shall be fixed using self drilling / self tapping screws of size ( 5.5x 55mm ) 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+5% total coated thickness ( tct ) , zinc coating 120gsm as per is: 277 in 240mpa 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 or with polymer coated j or l hooks, bolts and nuts and or g.i. seam bolts and nuts, g.i. plain and bitumenwashers complete : ridges plain ( 500 - 600mm ) . 4 providing and fixing precoated galvanised steel sheet roofing accessories 0.50 mm+5% total coated thickness ( tct ) , zinc coating 120gsm as per is: 277 in 240mpa 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 or with polymer coated j or l hooks, bolts and nuts and or g.i. seam bolts and nuts, g.i. plain and bitumenwashers complete : barge board ( upto 300 mm ) . 5 extra for providing and fixing wind ties of 40x 6mm flat iron section. 6 removing the damaged / torned pvc sheets covered in the roofingarea about300.00 sqm including stacking of serviceable materials and disposal of unserviceable material within a lead of 50m 7 credit for taking back the old unserviceable sheets