What is the effect of Exposure D on wind pressure?

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Prepare for the IIBEC GCK and Registered Roof Consultant exam. Study with flashcards, multiple-choice questions, and detailed explanations. Enhance your understanding of roofing standards, wind factors, and ASTM fundamentals to excel in your certification journey.

Multiple Choice

What is the effect of Exposure D on wind pressure?

Explanation:
Exposure D is open, flat, unobstructed terrain such as fields or shorelines. In this setting wind speeds near the surface are less disrupted by obstacles, so the wind can reach higher velocities at a given height. Since wind pressure increases with the square of wind velocity, these higher speeds produce noticeably higher dynamic pressures on surfaces. That’s why Exposure D yields the highest wind pressures among the exposure categories. In contrast, areas with buildings, trees, or other obstructions slow and disrupt flow, reducing the pressures experienced.

Exposure D is open, flat, unobstructed terrain such as fields or shorelines. In this setting wind speeds near the surface are less disrupted by obstacles, so the wind can reach higher velocities at a given height. Since wind pressure increases with the square of wind velocity, these higher speeds produce noticeably higher dynamic pressures on surfaces. That’s why Exposure D yields the highest wind pressures among the exposure categories. In contrast, areas with buildings, trees, or other obstructions slow and disrupt flow, reducing the pressures experienced.

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