Which roof area is the highest pressure zone?

Which roof area is the highest pressure zone?

• A. Center zone.
• B. Corner zone.
• C. Edge zone.
• D. Ridge zone.

Answer: (B)

The strongest roof uplift occurs where the wind flow wraps around the building’s corners, creating corner eddies and accelerated air that lowers the pressure the most there. In the corner region, two adjacent edges interact, producing the greatest suction on the roof surface. Edge zones experience substantial but less intense suction, while the center of the roof has the least because the flow is more uniform and less accelerated. Ridge areas on pitched roofs can have suction too, but typically not as high as at the corners. So, the corner zone is the highest uplift (most negative pressure) area on the roof.

The strongest roof uplift occurs where the wind flow wraps around the building’s corners, creating corner eddies and accelerated air that lowers the pressure the most there. In the corner region, two adjacent edges interact, producing the greatest suction on the roof surface. Edge zones experience substantial but less intense suction, while the center of the roof has the least because the flow is more uniform and less accelerated. Ridge areas on pitched roofs can have suction too, but typically not as high as at the corners. So, the corner zone is the highest uplift (most negative pressure) area on the roof.