In the lower course of brickwork every two feet or so, no mortar is applied creating a gap or space between the bricks. These weep holes allow for ventilation and moisture to escape.
During our inspections of homes over the years, we often find that homeowners like to seal these holes up (see left picture) to prevent rodents and insects from getting in. Whether it’s bees or wasps trying to make a home inside them or the perfect highway for ants to travel through, weep holes are a great invitation to unwanted guests. And if you like reptiles (see picture at right) what better place for a clutch of snakes 🙂 Sealing up these vent holes traps moisture and promotes mould growth, spalling of bricks, and the deterioration of building materials.
If you need to protect these openings from mice…or snakes…you can buy plastic / metal weep inserts to install in them that prevent bug / critter entry while allowing for ventilation.