The answer to 'when to replace downspouts' is that you should replace your downspouts every 20-25 years, or sooner if they become damaged, cracked, or detached from your home. Downspouts play a critical role in directing water away from your home's foundation, so it's important to keep them in good working condition.
Over time, downspouts can become worn down by the elements, leading to leaks, clogs, and other issues that can cause water damage to your home. Regular inspections and prompt repairs or replacements can help prevent these problems and protect your home from water-related issues.