When mouse proofing or pest proofing your house don't forget the weep holes. Weep holes or "weeper holes" are small openings left in the outer wall of masonry construction as an outlet for water inside a building to move outside the wall and evaporate. If you live in a brick house or have a brick facade on your house you almost certainly have weep holes. Weep holes are essential for the good health of your building.
Because brick is not waterproof and is actually quite porous it behaves much like a sponge. As a result, when it gets wet a masonry wall can absorb and store a tremendous amount of water. The weep hole is designed to ensure that water stored can escape and allows air to enter behind the wall, helping to dry the structure. Unfortunately, this opening is also a convenient entry point for unwanted pests such as mice, roaches, snakes, spiders and other undesirable critters. Fortunately keeping pests out while still allowing your weep holes to function as they are intended is easy and inexpensive. Whatever you do just don't fill the weep holes with mortar or caulk as that will not allow air to circulate or water to drain which could cause mold, rot or deterioration of your bricks. For years the most common solution was to simply stuff a little steel wool in the opening. The steel wool keeps pests out but still allows air and water to pass ensuring the weep holes function as intended. Unfortunately, steel wool rusts quickly and needs to be replaced annually. For a more permanent solution use some Xcluder fill fabric to permanently pest proof your weep holes. Because Xcluder is made of stainless steel wool and poly fibers it won't rust or deteriorate, it is impervious to pests, and its mesh design allows air and water to pass easily. Installation is easy too. Simply cut an appropriately sized strip of Xcluder and press firmly into each weep hole. If you have any left over material you can use that to fill any other openings that pests may use to enter your house such as openings for HVAC lines.