Building Loading - Wind Exposure (1991 UBC, 1994
UBC, 1997 UBC)
(Revised: 04/01/08)
Exposure B: Refers to terrain, which has buildings,
forest or surface irregularities 20 feet or more in height covering at least 20
percent of the area extending one mile from the site.
Exposure C: Refers to terrain, which is flat and generally open, extending one-half mile or more
from the site in any full quadrant.
Exposure D: Represents the most severe exposure in areas
with basic wind speeds of 80 miles per hour (mph) or greater and has terrain
which is flat and unobstructed facing large bodies of water over one mile or
more in width relative to any quadrant of the building site. Exposure D extends
inland from the shoreline 1/4 mile or 10 times the building height, whichever
is greater.
See also:
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Building Loading - Wind Load