To solve a mouse problem, I want to seal four 4" x 10" air vents in the cement foundation of my home. The home sits on sand and is dry. Can anyone tell me the best way to attach a piece of wood to cement? I have a small drill, but have never put a screw into concrete. I would prefer to use glue and then caulk, if this will do the job. I want to permanently seal the vents. I would also like to repair the area where the mice enter the main floor. It is located in a small closet right beside an electric hot water tank with a metal drip pan. The space is so small I would like to "pour" in something that would seal up the entry holes. I have tried stuffing the cracks with steel wool and covering the surface with wood, but it didn't work because the drip pan impedes access at the back. I worry about using something flammable because of the hot water tank. Thanks for your help.