Mice have been known to chew through electrical wires, fiberglass insulation batts, and rigid foam insulation. Generally, mice have no attraction to spray foam insulation, as it doesn’t represent a food source.Click to see full answer. In this way, is spray foam mouse proof?You can use spray foam to fill the hole. But don’t just use that. Rodents can chew through spray foam. Caulk is not rodent proof.Additionally, where should you not use expanding foam? Spray Foam Around Windows and Doors is A-Ok But it can actually push the jamb inward, making them impossible to open. Avoid this by using minimal expanding foam. It’s formulated to fill the space around windows and doors without excess expansion. Look for cans labeled for use on windows and doors. Regarding this, will rats eat through spray foam? Some people combine this with expanding foam, to improve the cosmetic appearance and prevent drafts. However, expandable foam alone will not stop rats – they will chew through it.Can mice eat through steel wool?A mixture of steel wool and caulking compound makes a good plug to seal small openings. You can’t use steel wool on its own because the mice will be able to pull it out or chew through it. Because of the way it’s woven, copper wool is said to get stuck in rodents’ teeth, making it difficult to move or chew through.