What does experience and testing indicate about water penetration through wall claddings?

Experience and testing reveal that both liquid water and water vapor can penetrate through wall claddings. This highlights the limitations of various cladding materials and the effectiveness of building envelopes in providing a barrier against moisture. Cladding can be designed to minimize water intrusion, but no system is completely impermeable under all conditions. Factors such as the material properties of the cladding, installation techniques, weather conditions, and the presence of deteriorative processes influence the extent of water penetration.

The understanding that both types of moisture can penetrate emphasizes the importance of proper drainage systems, ventilation, and moisture management strategies within wall assemblies to prevent damage from moisture accumulation. This is crucial for maintaining the integrity of the structure and ensuring indoor air quality. The acknowledgment that both liquid water and water vapor can infiltrate underscores the necessity of employing comprehensive building techniques that address potential moisture issues effectively.