Masonry veneer

Because brick itself is not waterproof, the airspace also functions as a drainage plane, allowing any water that has penetrated the veneer to drain to the bottom of the air space, where it encounters flashing (weatherproofing) and is directed to the outside through weep holes, rather than entering the building.

Brick ties are used for this purpose, and may take the form of corrugated metal straps nailed or screwed to the structural framing, or as wire extensions to horizontal joint reinforcement in a fully masonry veneer or cavity wall.

Typically, masonry refers to individual units that are placed in a mortar bed, making a distinction with panelized products.

Rainscreens are ventilated at the top and bottom of the cavity to prevent wind-driven rain from being driven into the building by unbalanced pressure.

Because of the enormous long-term potential for reducing energy requirements and improving occupant comfort, building designers should consult engineers or adopt configurations with known performances.