The answer to 'how long does roof last' is that the average roof lifespan is 20-30 years, depending on the roofing material and proper installation and maintenance. Asphalt shingles typically last 15-30 years, while metal roofs can last 40-70 years with good care. Proper ventilation, regular inspections, and addressing any issues quickly can help extend the life of your roof.
Factors that affect roof longevity include the quality of materials used, the skill of the installation, the local climate, and how well the roof is maintained over time. Homeowners should budget for full roof replacement every 20-30 years on average, while also addressing any repairs or maintenance as needed.