• Pre-IBC-Wall

    Pre IBC Wall (TYP)

  • Brick-Cavity-Wall

    Brick Cavity Wall (TYP)

  • Rainscreen-Wall

    Rainscreen Wall (TYP)

Since eliminating the opening was rendered an imperfect solution to the problem, efforts turned to the elimination of the third component, the force that drives water through an opening. The forces most difficult to combat in this capacity are air currents and pressure differentials. “Air currents result from differences in wind pressure over the wall surface, or from convection within wall cavities, and these may carry water into the wall. Also, when water is present on one side of an opening, and the air pressure on that side is greater than that on the other side, the water will be moved through the opening, no matter how small, in the direction of the pressure drop.”