If you’ve noticed a problem with condensation and moisture on your brick veneer walls, check for weep holes or a brick vent. If you find no evidence of either in your walls, this may be the source of your moisture problem. Try adding a brick vent to leach out any condensation that may be getting trapped in between the different areas of the wall and see if this improves the problem.
Step 1: Use a piece of chalk to mark the location of the bricks you wish remove and replace with brick vents. The bricks you choose should be four or five rows up from the bottom. You should pick one brick for every 6 to 8 feet. Choose the bricks carefully; you may wish to center the brick vents on the wall, or align them with an architectural feature.
Step 2: Cut out the bricks you have marked with a circular saw fitted with a masonry blade. You should cut into the mortar surrounding the brick, not the brick itself.
Step 3: Chip away any remaining mortar around the brick you have just removed with a cold chisel and hammer.
Step 4: Mix some mortar with your trowel. Create a generous bed of mortar on the bottom and sides of the cavity you have just created.
TIP: For this job, if you have no experience working with masonry, consider purchasing a masonry bag. This bag holds the mortar, allowing you to pipe it between the brick and the brick vents.
Step 5: Slide the brick vent partly into place. Pipe a bead of mortar onto the top of the brick vent, then slide it all of the way into place.
Step 6: Clean around the brick vent with a nylon bristle brush, making sure to remove any excess mortar to prevent staining the surface of the brick.
Step 7: Run a bead of exterior weather resistant caulk around the edge of the brick vent where it meats the brick wall. Use your finger to smooth the caulk into an orderly, concave shape. Continue this process until all of the brick vents are installed.