Sheets of metal are formed and joined together to form a custom-fit metal roof. Most metal roofing is secured onto a roofing frame with special fasteners that can be applied directly over or through preexisting roofing. Installation on a metal roof should be left to professional contractors because of the complexities involved with manipulating and securing the metal sheets.
Removing preexisting roofing can be quite costly. According to Cost Helper associates, it can cost the consumer up to $5 per square foot to have an existing roof removed to make way for a new roof. Removal fees also typically include proper disposal of the old roof.
Standing seam metal roofing is resistant to corrosion and generally much more durable and longer lasting than any other type of roofing. Steel, aluminum and copper are all types of metals used in metal roof construction. Metal roofing sheets are quite thin and lightweight which is one of the reasons they can easily be applied over an existing roof without creating too much extra weight.