The following design tables provide specific structural estimates for
different wind loads and soil types. These tables provide an accurate
estimate for fence design in non hurricane prone areas. To use these
tables follow these simple steps:
Verify site conditions for wind speed and soil conditions.
Identify the 50-year average wind speed where your project is
located. Reference the Uniform Building Code or Appendix C
of the National Building Code of Canada that provides a 1/50
hourly wind pressure that can be used.
Select a type of exposure based on the following classification:
Exposure B: Surface roughness consisting of urban and suburban
areas, wooded areas, or other terrain with numerous closely
spaced obstructions having the size of a single family dwelling or larger.
Exposure C: Surface roughness consisting of open terrain with scattered obstructions having heights generally less than 30 ft
(9.1 m) extending ½-mile (805 m) or more from the site. This category includes flat open country, grasslands, and bodies of
water under 1-mile (1.6 km) in width.
Exposure D: Describes the most severe exposure with surface roughness consisting of flat, unobstructed areas and bodies of
water over 1-mile (1.6 km) in width. Exposure D extends inland from the shoreline ¼-mile (0.4 km).