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re: fence wind loads

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There were a LOT of failed (overturned) fences and URM walls after the
hurricanes of 2004 went through central Florida.

The Miami-Dade section of the Florida building code allows the
following for fence design (where design wind speeds go up to 150
mph):

SECTION 2328 HIGH-VELOCITY HURRICANE ZONE-WOOD <<FENCES>>

 Wood fences, so located on a property that by zoning regulations they
cannot be used as a wall of a building, shall be constructed to meet
the minimum specifications in Sections 2328.2 and 2328.3.

Fences not exceeding 6 feet (1829 mm) in height, shall be constructed
to meet the following minimum requirements: from nominal 4-inch by
4-inch by 8-feet-long (102 mm by 102 mm by 2438 mm) posts No. 2 grade
or better spaced 4 feet (1219 mm) on center, and embedded 2 feet (610
mm) into a concrete footing 10 inches (254 mm) in diameter and 2 feet
(610 mm) deep.

Fences not exceeding 5 feet (1524 mm) or 4 feet (1219 mm) in height
shall be constructed as provided in Section 2328.2, except that the
spacing of posts may be increased to 5 feet (1524 mm) and 6 feet (1829
mm) on center for these heights, respectively.

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