Finally, if you decide to perform repairs on your metal roof yourself, be sure that you know how to do so properly. Always pair screws with washers, for instance - and never use them in recessed parts of the roof. If you do, indentations can be made and water can collect. This can increase the odds of rust and corrosion. Always use screws in raised areas of the roof to avoid this problem. It's just one more simple thing to keep in mind that will help your roof last as long as possible!