Rodent resistant insulation can be bought online or in hardware stores. Home Depot, for example, stocks insulation advertised as pest-resistant.
Pestblock insulating foam sealant is an example of a rodent-proof insulator, according to Home Depot. This product is pesticide-free. It protects homes against mice, and also against pests such as spiders, bees, ants and roaches.
Roxul insulation has a reputation through word of mouth for being rodent-proof, according to Roxul. However, the website says there is no surefire test to guarantee that it is rodent-proof. Roxul batt insulation can be bought online through Insulation 4 Us. The site has acoustic fire and comfort batt varieties.