The best time to repair or replace a roof is generally during the summer, spring, or fall when the weather is milder and more predictable. This allows contractors to work more efficiently and safely, reducing the risk of damage from extreme weather conditions. Asphalt roofs typically have a lifespan of 20 to 26 years, while wood roofs can last 20 to 30 years. Synthetic roofs, on the other hand, can last up to 50 years, and clay and concrete roofs can last 40 years.