Many people recommend venting masonry cavity walls especially when glazed brick units are used. Are open weep holes at the base of the wall enough?
There are two common ways to vent masonry walls. One method is to use open head joints or vents over open head joints both at the wall base and along its top. Vents at the top of the wall can be either on the interior side of the parapet or on the exterior. An alternate approach to leaving open head joints is to use brick-sized vents on the interior side of the parapets. These vents can be spaced farther apart because they allow much more air movement than open head joints. They are used typically with open head joints at the base of the wall.