The answer to 'how often to replace metal roof' is that a properly installed and maintained metal roof can last 40-70 years or more. Metal roofs are one of the most durable roofing materials available, with a lifespan significantly longer than asphalt shingles or other common roofing types. However, the exact lifespan can vary depending on factors like the quality of the metal, the installation, and the local climate conditions.
Regular inspections and minor maintenance like re-sealing fasteners or replacing damaged panels can help extend the life of a metal roof even further. Most experts recommend having a professional roofer inspect the roof every 5-10 years to identify any issues before they become major problems.