I had some workmen up and they told me that the roof I have on my shed is asbestos? My the shed was made by Silvermist, its telephone number is of the form TOWN 1234. IE: OLD! (However the shed is in very good condition) The roof is corrugated like Please login (registration is free!) to view this link. however it is not clear, and is about 3mm thick. How can I tell if it is made of asbestos? I'm thinking of replacing it as it leaks.