What should you do if unsure between Exposure B and C?

• A. The exam almost always wants Exposure A.
• B. The exam almost always wants Exposure B.
• C. The exam almost always wants Exposure C.
• D. The exam almost always wants Exposure D.

Answer: (C)

Wind exposure category tells you how much wind reaches a structure based on surrounding terrain and shielding. When you’re unsure between a more shielded option and a more exposed one, choose the more open exposure because it yields higher wind loads and provides a safety margin. Exam writers often expect this conservative choice when site details aren’t clear, so you’re less likely to underestimate forces on the roof system. The open exposure produces higher wind pressures than the shielded one, reflecting less shielding from nearby buildings or terrain. If you later confirm site specifics, you can adjust, but in an uncertain scenario the safer default is to assume the more open exposure.