Which of the following is NOT listed as a roof style?

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In this context, roof styles refer to the structural framing methods used to support the roof, not the external shape. The items tied-arch, bowstring truss, and exposed lightweight steel or combination trusses describe specific framing configurations that define how the roof is built and supported. A gable roof, on the other hand, describes a roof’s silhouette—a simple pitched shape with two sloping sides meeting at a ridge. It isn’t a distinct roof framing system listed in this category, which is why it isn’t included among the roof styles. This distinction helps you anticipate how a roof might behave under fire, since the structural system (not just the shape) drives collapse and ventilation considerations.