PART I - PROTECTING THE BRICK AGAINST WEATHERING
Freezing and thawing breaks down the bond, which is the only type of weathering that affects brick.
Therefore, the resistance of brick walls to weathering depends on their resistance to water penetration.
3-29. Tooling and Caulking. You can protect walls against moisture by making sure that joints are
well-tooled and by caulking around door and window frames.
3-30. Flashing. The installation of flashing, strips of metal or roofing paper that is bent to fit mortar
joints, is another method of protecting the brick against water penetration. Flashing keeps water from
penetrating and directs it to the wall exterior. It is usually placed at the head and sill of window
openings in some buildings and at the intersection of the wall and the roof (Figures 3-33 and 3-34).
Figure 3-33. Flashing at the head and sill of window openings