The answer to 'when to replace roof replacement' is that most roofs need to be replaced every 20-25 years, depending on the roofing material and local climate conditions. Asphalt shingle roofs typically have the shortest lifespan of 15-20 years, while metal, tile, and slate roofs can last 40-50 years or more with proper maintenance. Signs it's time to replace your roof include curling, cracked, or missing shingles, extensive moss or algae growth, and leaks in your home's interior.
Replacing your roof is a major home improvement project, so it's important to work with a licensed and insured roofing contractor who can assess the condition of your existing roof and provide recommendations on the best time to replace it. Delaying a roof replacement can lead to more extensive (and expensive) water damage to your home's structure and interior.