Seamless gutters are manufactured on-site in long pieces that are cut according to your home’s measurements. That means they are made to fit your home like a glove. Sectional gutters, on the other hand, are snapped together in sections. There is a seam at every point each section connects. Over time, these seams can start to loosen or wear, causing leaks in your gutter system. Debris can also get caught in the seams. This is why many homeowners opt for seamless gutters. They are a lot more durable and less likely to break over time.