Which statement best describes the uplift pressure pattern from Field Zone to Corner Zone?

Which statement best describes the uplift pressure pattern from Field Zone to Corner Zone?

• A. Field Zone has the highest uplift pressure
• B. Perimeter Zone has the highest uplift pressure
• C. Corner Zone has the highest uplift pressure
• D. Field Zone and Perimeter Zone have equal uplift pressures

Answer: (C)

Uplift pressure on roofs is not uniform; it tends to intensify toward corners due to the wind flow circulating around the building. At corners, flow separation and corner vortices create localized high-speed air and stronger suction, pulling more on the roof surface. Field zones away from edges experience relatively gentle suction because the airflow remains more attached and speeds are lower there. Perimeter zones along the edges see more suction than the field but typically less than at the corners. So the corner zone shows the greatest suction (most negative pressure), making it the best description of the pattern from Field to Corner. The other patterns don’t match the way wind concentrates its uplift around building corners.

Uplift pressure on roofs is not uniform; it tends to intensify toward corners due to the wind flow circulating around the building. At corners, flow separation and corner vortices create localized high-speed air and stronger suction, pulling more on the roof surface. Field zones away from edges experience relatively gentle suction because the airflow remains more attached and speeds are lower there. Perimeter zones along the edges see more suction than the field but typically less than at the corners. So the corner zone shows the greatest suction (most negative pressure), making it the best description of the pattern from Field to Corner. The other patterns don’t match the way wind concentrates its uplift around building corners.