tender for comprehensive maintenance for otm and md accn at lebong under age (i) darjeeling- 1 dismantling of plain or corrougated steel sheeting any guage thickness including nantinal or similar pattern roof covering, complete all as specified and as directed by engineer-in-charge. 2 s&f pre-painted galvalume aluminium zinc coating gi based corrugated or semi-corrugated steel sheet 0.50 mm thick of any colour having tensile strength of 550 mpa as in roof covering/cladding to wall, fixed with self tapping screws or j hooks, complete all as specified and as directed by engineer-in-charge. 3 s&f pre-painted galvalume aluminium zinc coating gi based plain steel sheet 0.50 mm thick of any colour having tensile strength of 550 mpa as in roof covering/cladding to wall, fixed with self tapping screws or j hooks, complete all as specified and as directed by engineer-in-charge. 4 dismantling of wall and ceiling boards (fiber, pulp, insulation, etc) or insulation boards/slabs/blankets, any thickness, including cover fillets, complete all as per specified and as directed by engineer-in-charge. 5 s&f aluminium snap grid frame work for false ceiling size of grid 605 x 605 mm, complete all as per specified and as directed by engineer-in-charge.