Spray foam insulation is in no way a repellant. Mice, bats, rats, and other pests can chew through wood to get into and out of your home. So, of course they can chew through the foam. Will mice eat through drywall? mice in walls but not in house.

Will mice eat Styrofoam insulation?

Destructive Potential House mice prefer to eat seeds and grains but have been known to eat bird eggs and baby birds. They are very destructive to clothes, upholstered furniture, car or other wires, and–alas–foam insulation. They spread many diseases such as bubonic plague and salmonellosis (food poisoning).

What material can mice not chew through?

Fill Up Holes With Steel Wool If you want to keep mice out of your house, bring on the steel wool. Unlike insulation, paper, or even drywall, mice can’t chew through steel wool, and even if they did, they’d be dead before they made it into your pantry.