In many situations this holds true for keeping rodents out of your home.
Mice are excellent climbers and our native mice (White-Footed and Deer Mice) are exceptional climbers. I remember camping once and I woke up at 1:30AM to attend to some business. As I exited the camper with my trusty flashlight (PMP’s always carry quality flashlights) I observed a White-Footed mouse climb the truck of a large Eastern Hemlock onto a large branch and disappear into the dark woods!
If you want complete mouse proofing, seal everything larger than 1/4” all the way up to and including the gutter line. Our company has always struggled to be competitive in offering this service to our clients due to the cost of enormous amount of labor and it’s tedious nature. We do offer it though if anyone is interested in it.
President - Environmental Health Services, Inc.