Posted by Frank Murch | Dec 3, 2015 8:30:00 AM
Large Banners have special requirements. Most banners are on the side of a building or are smaller. But dealing with the effect of the wind requires some special techniques.
Average wind speed is not the real problem. The problem is a gust of wind. A 35 mph steady wind is often easier to deal with than a series of 35 mph gusts. The reason is that the gusts jerk the seams and gommetts pulling them apart. The snap of the wind stresses the matterial. Anchor points and stressed and the banner will start to come apart at the weakest point.
There are a number of things you can do to make banners strouger and distributing the stress over a larger area. There are also a number of things to reduce stress. Here is a list
A cord or rope in the hem puts more stress on the rope and less on the banner. Ropes are made for stress.
Reinforcing Grommets with additional banner material is a great idea. You can see these in the form of eninforce corners.
Heavier material. Many banners are made from 12 or 13 oz. material. Using an 18 or 22 ounce vinyl or heavy poly cotton increases the banners ability to resist wind more than the 150% increase in thickness.
Addition of “Air Relief” holes. These are half circle holes in the banner. The idea is wind will push these open and flow through reducing the resistance on the banner. Some citiy ordenantes specify these in thier signage codes.
Open mesh materials – these are specialty materials with an open weave to let the air pass, but still have a graphic on one side.
Heavier material. Many banners are made from 12 or 13 oz. material. Using an 18 ounce vinyl or heavy poly cotton increases the banners ability to resist wind more than the 150% increase in thickness.
Need a really large banner? Signs for San Diego does a lot of these and can help you get and over the street banner or other large banner
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