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A: Hello mjfromga - From the sound of it, this would be a situation where the product would be injected into a closed cavity or void. This is not recommended because the Great Stuff Pro™ (and Great Stuff™) product requires moisture to make the product cure. It needs to be sprayed in an open cavity where the product can get the moisture it needs to cure. If the product does get enough moisture, the product will remain gooey and will eventually start to seep out of the area. DuPont does not offer a product for an application in an enclosed void. As for the ant issue, if it is the same situation as above, we'd recommend avoid using a one component foam like the Great Stuff™ or Great Stuff Pro™.
A: Hello David - Yes, this product does expand. This product can be used to fill up to a 3-inch gap.
A: Yes, as shown in the product description, it expands and can fill up to a 3 inch gap.
A: Hello Kimm - On the Energy Star website, Insulation Tax Credit. Under what products are eligible, the following is listed: Spray foam in a can, designed to air seal. https://www.energystar.gov/about/federal_tax_credits/insulation