Find your Wind Zone in the Wind Zone Map. There are eight (8) Wind Zones in the contiguous 48 states (85 mph, 90 mph, 100 mph, 110 mph, 120 mph, 130 mph, 140 mph and 150 mph). When looking to buy a residential or commerical flagpole, it is important to choose a flagpole that will meet or exceed the maximum wind speed to which the flagpole will be subjected.
The National Association of Architectural Metal Manufacturers' (NAAMM) Guide Specifications For Design Of Metal Flagpoles (ANSI/NAAMM FP 1001-07) have determined the maximum wind speed for both nylon flagged and unflagged flagpoles using ground set installations. Once you have determined your Wind Zone, choose a flagpole with a higher maximum wind speed both nylon flagged and unflagged.
ANSI/NAAMM FP1001-07 publishes a map from the ASCE/SEI 7-05 Minimum Design Loads for Buildings and Other Structures showing values representing nominal 3-second gust wind speeds in miles per hour at 33 feet above ground level. A reproduction of this map is provided and should be used to specify the proper flagpole for your application. Please note that Special Wind Zone Areas, including but not limited to mountainous terrain, gorges, and ocean promontories, should be examined for unusual wind conditions.
The specification and installation of a flagpole with wind speed ratings that do not meet the maximum wind speed for the project location, or flagpoles flying flags and banners that exceed the NAAMM recommended flag size, can result in personal injury and/or property damage. Flags should always be removed from the flagpole during severe weather events.