repair and maintenance of bhusa shed , repair and maintenance of bhusa shed , steel work welded in built up sections/ framed work , including cutting , hoisting , fixing in position and applying a priming coat of approved steel primer using structural steel etc . as required . in grating , frames , guard bar , ladder , railing , brackets , gates and similiar work , roofing providing and fixing precoated galvanized 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 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 12 metre or as desired by engineer in charge . the sheet shall be fixed using self drilling/ self tapping screws of size ( 5 . 5*55 mm ) with epdm seal , complete upto any pitch in horizontal/vertical or curved surfaces , excluding cutting to size and shape wherever required . , providing and fixing precoated galvanized 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: ridges plain ( 500-600mm ) , dismantling roofing including ridges , hips , valleys and gutters etc . , and stacking the material with 50 metres lead of: g . s . sheet