tender for replacement of asbestos sheets with galvalum roofing sheets at type – ii parking sheds as per annexure-“a”; 1 dismantling of asbestos cement (corrugated, semicorrugated, etc.) sheets in roof coverings as specified and directed. 2 s&f of pre-painted galvalume aluminum zinc coating gk based corrugated steel sheet 0.50mm thick of an colour having tensile strength of 550mpa as in roof covering / gladding to wall, fixed with self tapping screws as specified and directed 3 s&f of pre-painted galvalume aluminum zinc coating gi based plain steel sheet 0.50mm thick of any colour having tensile strength of 550mpaas in roof covering/cladding to wall, fixed with self tapping screws as specified and directed. 4 surfaces of any description, over 10cm in width or girth, not otherwise described surfaces of any description, over 10cm in which or girth, not otherwise described. preparation of old painte surfaces two coats synthetic enamel (ordinary tint) as specified and directed.