Well, here's what I can tell you about mice. When we designing a new 2,500 square foot research lab at NREL, we learned that mice can get in a hole 1/4" in diameter. So it doesn't take much for them to get in.
I use stainless steel sponges to stuff up cracks as it doesn't rust. http://www1.mscdirect.com/cgi/NNSRI...re=ItemDetail-_-ResultListing-_-SearchResults You can cut it with scissors and a 6-pack of these things goes a long way.
An old boss of mine at NREL advised against using poison as the little buggers will go find a place to hide when they start feeling the effects of the poison. Then they croak and stink to high heaven as they rot.
The problem is that barns are notoriously full of holes making it easy for the little buggers to get in.
I use stainless steel sponges to stuff up cracks as it doesn't rust. http://www1.mscdirect.com/cgi/NNSRI...re=ItemDetail-_-ResultListing-_-SearchResults You can cut it with scissors and a 6-pack of these things goes a long way.
An old boss of mine at NREL advised against using poison as the little buggers will go find a place to hide when they start feeling the effects of the poison. Then they croak and stink to high heaven as they rot.
The problem is that barns are notoriously full of holes making it easy for the little buggers to get in.