I have a question, I can see some blue foam maybe 1/4" thick under our sill plate in the garage. Is this some type of house wrap(i'm only familiar with tyvek), and since it's under the sill plate should I assume it is around the whole house? The reason i'm asking is I was not aware that house wrap goes under the sill plate. Also the sill plate has a green tint to it, is this because it is pressure treated? Thank you!