The answer to 'lifespan of roof' is that the average lifespan of a roof can range from 20 to 50 years, depending on the type of roofing material used and the local climate conditions. Asphalt shingles typically last 20-30 years, while metal roofs can last 40-70 years, and slate or tile roofs can last 50-100 years with proper maintenance.
The lifespan of a roof is influenced by factors such as the quality of the installation, the amount of exposure to the elements (sun, wind, rain, snow), and the frequency of maintenance and repairs. Regular inspections and timely repairs can help extend the life of a roof, while neglect and severe weather can shorten its lifespan significantly.