The answer to 'when to replace metal roof' is that metal roofs typically last 40-70 years, depending on the quality of the metal and the climate. However, factors like severe weather, corrosion, and damage can shorten the lifespan. As a general rule, it's recommended to inspect your metal roof every 5-10 years and replace it if it shows significant wear or damage.
Some common signs that it may be time to replace a metal roof include visible rust or corrosion, leaks, missing or damaged fasteners, and cracked or loose panels. If you notice any of these issues, it's best to have a professional roofing contractor evaluate the condition of your roof and provide recommendations on whether it should be repaired or replaced.