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What is typically not shown on a roof plan?

  1. Trusses or rafters

  2. Roof pitch details

  3. Roof drainage systems

  4. Material specifications

The correct answer is: Trusses or rafters

In architectural and construction drawings, a roof plan primarily focuses on the layout and design of the roof system. It includes elements that are essential for understanding how the roof will function and be constructed. Roof pitch details, roof drainage systems, and material specifications are key components that inform how the roof will be built and perform under various conditions. However, trusses or rafters are structural elements that are often represented in structural plans rather than roof plans. A roof plan is more concerned with the overall shape and configuration of the roof rather than the specific internal structural components like trusses or rafters. Therefore, it is typical for these structural details to be omitted from the roof plan, which instead provides information pertinent to the roof's surface and associated features.