Great stuff pest block insulating foam sealant blocks insects and pests from entering the home by sealing gaps, cracks and holes where they commonly enter. Specially formulated to block pests. Great stuff pest block insulating foam sealant expands to fill, seal and insulate gaps up to 1 in. (25mm), forming a long-lasting, airtight and water-resistant barrier. It is specially formatted with a bitter ingredient and blocks pests out of the home by eliminating points of entry. The sealant blocks the entry of pests that can damage the house and its contents contains no pesticides. Reduces the need to reapply pesticides and helps improve the home's energy efficiency by sealing gaps and cracks, reduces air leaks. In Addition to blocking pests from the home, great stuff pest block air-seals holes, gaps, and cracks to help keep air from leaking out of or seeping into the home's envelope. Air-sealing and insulating the home saves up to 20% on heating and cooling costs.