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Experts from the State of Conn. Environment Department have some good ideas on how to protect your home from these not invited guests:
Let me know if this is helpful with your request by rating my answer. If you need additional info, please contact me and I will continue to search for an answer.
Best of luck in getting rid of your visitors!
Another good source that talks about roof and ceiling:
Seems like the most effective way is to trap the critters but the problem with that is that there are other critters, too; how would I know I trapped the "residents" and not some other animal (I live where forest surrounds the house). I don't see that wire mesh would help if there are babies inside: they'd destroy more to get to their offspring. Your second reference is more specific and will help more in what I have to do. Thanks for your persistence.
It does look like my second link is what you need in order to stop the visitors. Good luck with this and please rate my answer so that I receive credit for your question.