If you are speaking of national or state flags, there is a certain formula for each flag post.
Initially, wind speed is the very first consideration. Regionally, the West Coast of the US is considered the lowest wind area, based upon a half a century high wind speed at 30 feet over the ground, times 30% for wind gusts. So, if you want a 12′ x 18′ flag in Seattle, WA, it will need to be established whether the flag post you want to make use of can withstand an 85 mph wind x 1.3, or 111 mph winds.
Miami, on the other hand, needs to be ranked at 150 miles per hour winds time 1.3, or 195 mph winds. They have extra storms in Florida than take place in Seattle. Maybe I might write a brand-new song … “in Harborton, Hampton, and Hillsboro (OR), storms barely happen” (apologies to Lerner and also Loewe’s My Fair Woman).
The next factor to consider is the wall surface density of the post itself. As the height of the pole rises, the wall surface density will certainly likewise boost. For instance, a 20′ post, wind-rated for 120 miles per hour while flying a 5′ x 8′ flag, will certainly have a lightweight aluminum wall density of.188″; a 60′ post will increase to a wall density of.25″ to retain the same score for the 120 mph wind with a 12′ x 18′ flag. As well as an 80′ flagpole, flying a 20′ x 30′ flag, will certainly lose some wind speed score to 105 mph, even though the wall thickness is currently.375″.
Finally, as suggested above, the dimension of the flag will certainly likewise be reflected in the wind load rating. The bigger the size, a lot more pull the wind will certainly place on the post. The sizes suggested over are the optimum size advised for the mentioned post dimensions.
Flag Post Base
The other aspect will certainly be the quantity of ballast around the base of the pole. This will include concrete, the pole sleeve, and sand (as well as a little bit of mastic to maintain the water from saturating the sand in the pole sleeve).
The company you purchase your flag and flag pole from will certainly give you the correct computations (normally in cubic lawns) for the amount of pre-mixed concrete you’ll need to use to see to it the post you select will provide you the right amount of ballast weight for wind speed called for by your state, metropolitan or region laws.
Just how do you install banners as well as flags on light poles?
Typically you’ll utilize either a solitary arm or dual-arm horizontal pole that’s connected to a light pole or comparable. There are fixed arm pole banner mounting arms and adaptable arms.
A lot of pole banners are no larger than 36″ x 72″, so the wind lots are not the like the flag posts discussed previously, but there can still be a substantial wind load on these banners. Generally, the top of these flags disappears 20 feet above the ground, but if you have two 3-foot by 6-foot banners connected to a post, watch out … you have a close equal 6-foot by 6-foot flag.
See to it the post you’re attaching these banners to is able to endure this sort of wind, and if not, you may wish to think about buying the spring-loaded arm kind banner post arms that will flex with the wind to launch strong wind lots. Sneak a peek at this article for more info on flags.