Eaves troughs and downspouts. Typical issue with installation and how builders tend to install such that your roof cover warranty is void — draining water collected from an upper roof onto a lower roof instead of directly into the lower eaves trough. Of course you can replace a piece of the roof cover, but realistically, you don’t want to end up with a situation where part of your roof cover is 11 years old and part is at year zero. If building a home, tell your builder to extend the downspouts all the way to the lower roof’s eaves trough. If you’re buying a pre-owned home, plan to correct this issue before too much time passes!