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Class 2 - Joisted Masonry structures are defined by having exterior walls constructed of noncombustible materials, such as masonry, with floors that are typically made of combustible materials. This allows for a balance in construction; the durable masonry walls provide fire resistance and structural integrity, while the use of combustible floors can make the construction more economical and versatile.

The classification is part of the broader framework used in insurance and building codes to assess risk and fire safety based on the materials used in construction. Joisted Masonry classifications are important in determining insurance rates and coverage, as they inform underwriters about the potential risks associated with fire spread and structural failure.

Other definitions, such as those involving only noncombustible materials throughout or being solely wooden framing with brick veneer, do not align with the characteristics of Class 2 structures, which specifically acknowledge the combination of materials for walls and floors. Additionally, structures designed with a fire-resistant rating may involve various materials and specifications not limited to this classification.