Final answer:
Efflorescence water stains are white, powdery deposits that indicate water penetration into cladding, suggesting potential structural issues due to water damage.
Step-by-step explanation:
Water penetration into the cladding can occasionally be observed on the exterior wall in the form of efflorescence water stains. Efflorescence is a white, powdery, or crystalline deposit of salts that can form when water seeps through and evaporates from a material such as brick or stone. This is a clear indication that water is infiltrating the wall system and can be a concern as it suggests there could be underlying structural issues caused by water damage, including deterioration of the cladding material and impact on the wall's structural integrity.
Water penetration into the cladding can occasionally be observed on the exterior wall in the form of water stains. These stains are often caused by leaks or water seepage through cracks or gaps in the cladding or the underlying structure.