A fun place to discuss metal building
To add strength and resistance from getting corroded the sheet of iron or of any iron based alloy is galvanized with a relatively resistant metal like Zinc or Tin and is bent in a shape of a semi circle. It is a piquant surprise to know that the first entity to manufacture and user of this innovative product were the USA navy. The reason was very simple that necessity is the mother of all inventions. Most importantly the structure of the Quonset huts is weatherproof and allows no leakage which is a common threat to most of the perishable material that need storage. Earlier it was used only by some specific businessmen, but recently its use and applications have expanded many folds.