Which organization defines the key roof zones used in wind design?

• A. ASCE.
• B. FM Global.
• C. IBC.
• D. ASTM.

Answer: (A)

Wind design uses a standardized pattern of pressure across the roof that reflects how wind acts on different parts of the surface. This pattern is defined by dividing the roof into zones—areas like near the edges and at corners, plus the interior—and assigning specific pressure coefficients to each zone to calculate uplift accurately. The organization that defines these roof zones and their accompanying coefficients is ASCE, through ASCE 7. This standard provides the zoning framework used in wind-load calculations and is incorporated into building codes. FM Global, IBC, and ASTM play important roles in related standards and code adoption, but the actual roof-zone scheme used for wind design comes from ASCE.