You are probably wondering if rodents and pests affect installations. Well, spray foam insulation offers no food value to rodents or pests. It should be noted that open cell spray foam would not present a barrier to their entry if they decided to gnaw through it.
Therefore open cell spray foam should not be considered a barrier to rodents or pests. On the other hand closed cell spray foam is a very dense two pound foam, and when it cures it can compare to concret. With that being said, it is very tough for small insects, rodents and other pets to penetrate the foam.