Best Insulation to Keep Mice Out: What Really Works in Attics?
The best insulation to keep mice out is a question I get more than almost any other, usually from someone standing in their attic holding a flashlight and a very unhappy expression. They just found tunnels in the fiberglass. Little black droppings everywhere. Maybe a nest made of shredded pink stuff that used to be their energy savings. I wish I could say there’s one magic product that fixes it all. There isn’t. But some choices are a lot smarter than others, so let’s get into it. Why Mice Love Your Insulation So Much To a mouse, regular fiberglass batts and loose-fill are basically a free hotel. Soft, warm, easy to dig, and plenty of it. They tunnel right through, pull out chunks for nesting, and then use the same stuff as a bathroom. All winter long. A mouse only needs a hole about the size of a dime to get in, which is smaller than most people believe, and a single pair can multiply into a crowd before you even notice anything is wrong. The sneaky part is that insulation hide...
