What are the main roof zones identified by ASCE in wind design?

What are the main roof zones identified by ASCE in wind design?

• A. Field, Perimeter, and Corner zones, each experiencing different wind pressures.
• B. Inner, Outer, and Edge zones.
• C. Top, middle, bottom zones.
• D. Left, Right, and Center zones.

Answer: (A)

ASCE wind design divides a roof into three regions to reflect how wind pressure changes across the surface: field (the central area away from edges), perimeter (the edges along the eaves and parapets), and corner zones (where two edges meet). The field experiences relatively uniform, moderate pressures; the perimeter sees higher suction along the edges due to flow separation and edge effects; and the corner zones experience the strongest suction because wind accelerates around corners and combines the edge effects. This zoning lets engineers apply appropriate pressure coefficients to each area when sizing roof coverings, fasteners, and edge details. Other labelings like inner/outer/edge or top/middle/bottom aren’t how ASCE categorizes roof wind pressures, so they don’t fit the standard approach.

ASCE wind design divides a roof into three regions to reflect how wind pressure changes across the surface: field (the central area away from edges), perimeter (the edges along the eaves and parapets), and corner zones (where two edges meet). The field experiences relatively uniform, moderate pressures; the perimeter sees higher suction along the edges due to flow separation and edge effects; and the corner zones experience the strongest suction because wind accelerates around corners and combines the edge effects. This zoning lets engineers apply appropriate pressure coefficients to each area when sizing roof coverings, fasteners, and edge details. Other labelings like inner/outer/edge or top/middle/bottom aren’t how ASCE categorizes roof wind pressures, so they don’t fit the standard approach.