A Hole Lot Better
The practice of cutting one.
Now let's cut some holes in it, say ten of them, each 200mm in diameter. The action of the wind now is shown on Figure 2:
The holes allow those wind streamlines x 0.22 ÷ 4 = 0.31 three.
Cut fewer and smaller holes? Sure, but any percent reduction in wind load can be if allowed to flap in the wind. The heavier the supporting scrim, the better the physical properties of the material, but the less smooth the printing surface. Because of this trade-off, most banner substrates on offer weigh about 340gsm (10 oz/yd2), which is really not adequate for high wind exposure. In this environment, opt for a 440gsm (13 oz/yd2) or 2), which typically has 2) material.
The most important factors are how the banner is fabricated and supported. Always ensure the connection points are adequately reinforced. When installed, the banner should be kept taut to reduce the likelihood of flapping, and attached from as many eyelet points as possible to avoid concentration of stress.
