This is a west coast beach area home. The laundry area is in the garage. I have a 2'x 2' hole in the wall, which appears to be plaster over drywall, although there is also a concrete foundation 12" high with a double-header on top at the bottom of the hole. If I install a drywall patch to the hole, do I still use vapor barrier and chicken wire over the top, and do I need some type of bonding agent to adhere the patch. There is also missing plaster over the foundation wall below the hole. How do I adhere the plaster patch to that as well?