Flagpole Wind Speed Chart

Flagpole Wind Speed Chart

 

The map below shows the maximum steady wind expected at an elevation of thirty feet above ground level within a fiftyyear
period of recurrence. Areas with the same maximum constant or steady wind speed are indicated. Because wind
speeds are usually not constant, and gusts are involved, flagpoles ( both flagged and unflagged) are listed in this catalog
with a constant wind speed and a 1.3 gust factor. “WARNING” - recommended flag sizes throughout this catalog do not
represent a warranty that the flag size shown may be safely flown in all wind speeds. Personal injury, flagpole damage or
property damage can occur when flying oversized flags and banners or flying flags in higher winds than recommended.
Flagpoles and their associated wind speeds listed assume that ten percent of the overall length of the flagpole is buried
per or recommendations at or near ground level. Special engineering may be required for other applications such as wall
or roof mounted flagpoles.

Flagpole Wind Speed Chart

 

 

Design of safe flagpoles requires knowledge of the loads to which they will be subjected. Principal load acting on
flagpoles is wind load and that load must be carefully determined. Maximum wind speeds to which flagpoles are exposed
depend on geographical location, whether or not it is in the center of a large city, a small town’s outskirts, seashore, at
ground level or on the roof of a high building. Wind speeds generally are higher along coastal areas than inland. They
are also higher in open country than in the center of cities. Wind speed also becomes greater as height above ground increases.  

Wind exerts a force on the pole as well as the flag, thus both loads must be added to determine total load. Flags
of different sizes are designed to be flown from different poles. Obviously, it is important that flagpoles be selected
which are capable of supporting the largest flag intended to be flown in the highest wind speed to which it will be
subjected. Loads on flagpoles are resisted by the mounting foundation, roof or wall to which it is secured.

 

By Chad Creech, All Star Flags