Masonry veneer walls are described as:

Masonry veneer walls are characterized by their structural properties and installation methods. They are typically constructed using brick, stone, or concrete blocks that serve as an outer layer of a wall. This outer layer is primarily aesthetic but can provide some degree of insulation.

Describing masonry veneer as brittle is particularly relevant because it emphasizes the material's susceptibility to cracking under stress or pressure. Unlike some materials that can flex or bend (like wood), masonry does not have this flexibility, making it more likely to crack if subjected to significant structural movement, temperature changes, or impact. Understanding this characteristic is crucial for assessing the potential risks associated with masonry veneer in various environmental conditions or load-bearing scenarios.

The other choices might deal with aspects related to construction or function that do not accurately describe the inherent properties of masonry veneer. For instance, while some masonry veneers may be partially supported or integrated with framing systems, saying they are "hung on studs" may not capture the full extent of how they interact with other structural components. The option mentioning watertight attributes can be misleading, as masonry veneer typically requires an underlying moisture barrier to prevent water intrusion. Lastly, while masonry can have some robust qualities, describing it solely as brittle captures an essential aspect of its behavior when subjected to stresses.