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"Whenever I need insulation work done on my shows or for my construction company, it’s Insta I call." ~ Bryan Baeumler

Is the spray foam foam mouse/insect proof?

Spray foam is not mouse or insect proof.  But the fact that it is dense make it more difficult for mice and insects to get through it thus meaning you will find less mice and insects in spray foamed homes. Secondly the fact that mice and rodents done sense the heat as readily in the winter means they don’t know its warm on the other side and really don’t know where is warm.  Termites and ants both like the insulating qualities of spray foam.  If you have termite or ant problems they should be taken care of first prior to any spray foam install as it is difficult to treat once the home is spray foamed.  If the home has been spray foamed termites and ants are less likely to come in the same as another insect.