Metal roofs are very durable, but because of storm damage, rust, or expansion and contraction of the metal, they occasionally need repair from sheffield metals: locations of failed metal roofing:

Metal roof, where they fail and repairs:

Failed fasteners – The screws are either too tight, too loose, or off-center and allows water to enter at open spots.
Failed seam – The seam, or side rib where two panels are connected, could be formed incorrectly or seamed improperly by the installer.
Failed flashing – Flashing is the material, typically metal, added to prevent moisture from entering at joints or additions on a roof, like pipes, chimneys, or valleys. Since they are add-ons requiring sealants and precise installation, flashing points could easily be the source of a leak. Actually, when a standing seam metal roof has a leak, it is commonly at some type of flashing area.
Failed sealant or butyl tape – Sealants and butyl tape are used to seal out water, dirt, and other debris that could compromise a metal roof. If these are damaged, missing, or applied incorrectly, leaks could occur.
Use of inadequate details – Ask about the details a contractor intends to use during the install of your metal roof. Do they match the manufacturer’s recommended details? If their installation details are not acceptable for a manufacturer’s weather-tight warranty, it’s also not adequate for your home or building. Involve yourself early on in the process and ensure your installer uses the manufacturer’s details.