Home / Building structures & components / Pipes and Plumbing / Asbestos cement water tanks Asbestos cement water tanks Description Once commonly installed as header tanks in the roof space of older houses. If bypassed directly to mains water supply, they remain in situ unused. Years of production/use Prior to 1990 Brands/products Not yet identified Residential uses Roof spaces Industrial uses Flat roof areas Be aware Removable AC lid for access to valve components. Edging of tank/lid can be damaged.Externally installed tanks may be damaged due to weathering.