The answer to 'lifespan of flat roof' is that a properly installed and maintained flat roof can last between 10-20 years on average. Flat roofs are more susceptible to wear and tear than sloped roofs, so their lifespan depends on factors like the roofing materials used, climate, and quality of installation and maintenance.
Flat roofs made with high-quality materials like modified bitumen or single-ply membrane tend to last longer than those with built-up roofing or rubber roofing. Proper drainage, regular inspections, and prompt repairs are also key to maximizing a flat roof's lifespan. Calling in a professional roofing contractor for maintenance and repairs is recommended to ensure the roof continues functioning effectively.