My goal is to keep hot/cool air from seeping between floors. Is canned spray foam the way to go? Any recommendations? Pest resistance is a bonus.
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If this is the ceiling and a small room I would put a utility ceiling in. Where I live for a room like a simple washing room that would be 150 euros tops and you can always run new wires and get to the old ones without hassle. Nothing else will make it look pretty.