The answer to 'when to replace gutter installation' is that you typically need to replace your gutters every 20-30 years, depending on the material and local climate conditions. Gutters made of aluminum or steel tend to last longer than those made of vinyl or wood. Over time, gutters can become damaged, clogged, or detached from the roof, which can lead to water damage and other problems if not addressed.
Signs that it may be time to replace your gutters include sagging, leaking, rusting, or pulling away from the roof. You should also inspect your gutters regularly for any debris buildup or issues. If you notice any problems, it's best to have a professional roofing technician take a look and provide recommendations on whether to repair or replace the gutters.