Water exists as solid, liquid, and gas, with vapor being a significant concern for buildings. Humidity affects comfort and moisture levels can lead to issues like mold. Proper placement of vapor retarders and air barriers is crucial to manage water vapor and prevent condensation and related problems within building cavities.
Understanding exterior wall assemblies is crucial in preventing water infiltration. Historically, the barrier concept aimed for a completely sealed exterior, which inevitably led to failures over time due to material breakdown and external elements. The modern rainscreen system, however, acknowledges that some water penetration is unavoidable. It incorporates an air space and watertight membrane, providing superior, long-term protection and reliability.
