Does Spray Foam Keep Mice Out of Ontario Homes?

Spray foam helps keep mice out, but it is not pest-proof on its own. Foam seals the small gaps along sill plates, rim joists and utility penetrations that mice use to get inside, and it gives them nothing soft to nest in or eat. A determined mouse can still chew through exposed foam, so the best results come from pairing foam with materials mice can't chew.

Every fall, as temperatures drop across Guelph and Wellington County, mice start looking for a warm way in. Many of the rim joists we open up have nests, droppings and chewed batts behind them, because loose fiberglass offers a perfect home right at the most common entry point. Sealing that area properly is one of the most effective pest-control steps a homeowner can take, and it saves heat at the same time every winter.

This guide from the installers at Super Sprayers explains how mice get into Ontario homes, what spray foam does and doesn't stop, how to combine it with steel wool and mesh, and what to do when mice have already damaged insulation in an attic or barn. It applies to insects too, which are far less of a concern than rodents.