The exterior walls of Type III construction are composed primarily of which material?

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Multiple Choice

The exterior walls of Type III construction are composed primarily of which material?

Explanation:
Type III construction uses exterior walls that are noncombustible, with interior framing that can be wood. The exterior walls are typically masonry—brick or concrete masonry units—because masonry provides the necessary fire resistance and mass to form a fire-rated exterior envelope while allowing a lighter interior frame. Wood framing on the exterior would violate the noncombustible exterior-wall requirement, which is why masonry is the correct description for the exterior walls in this construction type. While other noncombustible materials could theoretically be used, masonry is the classic and most common choice for Type III exterior walls.

Type III construction uses exterior walls that are noncombustible, with interior framing that can be wood. The exterior walls are typically masonry—brick or concrete masonry units—because masonry provides the necessary fire resistance and mass to form a fire-rated exterior envelope while allowing a lighter interior frame. Wood framing on the exterior would violate the noncombustible exterior-wall requirement, which is why masonry is the correct description for the exterior walls in this construction type. While other noncombustible materials could theoretically be used, masonry is the classic and most common choice for Type III exterior walls.

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