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Is there a formula or recommendation for size and placement of wind vents in a banner. I'm working with 2 sizes - 60" x 30" & 160" x 36" - both 14oz.
Thanks.
-------------------- Robert Graham Grahamsville Signs 1120 E McReavy Road Union, Washington 98592 360-898-2260 Fax 360-898-2262 e-mail:gvs@hctc.com Posts: 135 | From: Union,Washington - USA | Registered: Oct 1999
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I don't know about the cuts. So I can't help with them. Seems to me it would be smarter to string it tighter than the elastic on Aunt Elsie's drawers on the top and use bungees on the bottom.
One theory is that wind vents weaken the banner material and result in premature banner failure. Wind vent blowouts are just that - no more banner. Without vents, the banner tears at a seam which is usually repairable (but not always)
The folks on the other side of the argument say that the weak point of a wind vent is the spot where the cut ends, and you just strengthen that point by rounding the edge with a hole punch, or by putting a spot of adhesive there to prevent a run.
If your client insists on wind vents, I would suggest 18" to 24" intervals, 6" semicircles, flap down so that gravity keeps it closed.
Position them visually to minimize the impact on the banner's message.
-------------------- Victor Georgiou Danville, CA , USA Posts: 1746 | From: Danville, CA , USA | Registered: Dec 1998
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Forget the wind vents! They really don't do much, EXCEPT become a source of tears!
For example: If you cut a 12" half moon every other foot, above and below the line of copy...on the 160" banner you will wind up with 12 cuts. That is only 14% of the surface area! Not only will it look ugly, each and every one of those cuts is a source for the material to tear!
Just my humble opinion!
-------------------- Si Allen #562 La Mirada, CA. USA
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Brushasaurus on Chat Posts: 8831 | From: La Mirada, CA, USA | Registered: Nov 1998
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I used to cut them in all of the time... really hated that part after doing all of that work. I read an article or maybe words from a manufacturer saying not to cut wind holes. OK, so I tried it. I haven't cut one in 6 or 7 years now and all have held up well. Bungee-ing 4 corners seems to be the way to go for me. Once in a while you might have to tighten up the cord if it stretches out... or tell your client to do that.
-------------------- Jeff Vrstal Main Street Signs 157 E. Main Street Evansville, WI 53536 1-608-882-0322 Posts: 670 | From: Evansville, Wisconsin | Registered: Sep 2001
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Robert...follow Jeffery's advice and secure them from the corners tightly so the entire banner surface can take the wind pressure uniformly like the sail on a sailboat.....if you make cuts in it,you have the same principle as an airplane wing...air going thru the cut creates "lift" at those points and is gonna cause the banner to bow backwards toward that lift,thats why you so often see windcut banners you can hardly read because they're bent in half,not to mention yes it looks ugly and yes no matter what you do it seems to tear at the cut points. Just my .02
-------------------- Gavin Chachere Plotter in the garage,New Orleans La.
"Sgts Shugart and Gordon again request permission to rope down to crash site two" Posts: 1223 | From: new orleans.la. | Registered: Mar 2000
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Thank you for your replies and help. They have been very helpful. I don't think the vents will be necessary the way these banners will be used and mounted. Thanks again.
-------------------- Robert Graham Grahamsville Signs 1120 E McReavy Road Union, Washington 98592 360-898-2260 Fax 360-898-2262 e-mail:gvs@hctc.com Posts: 135 | From: Union,Washington - USA | Registered: Oct 1999
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We have some towns around here that sign ordinace Requires Over the road banners to have wind slits. You just can't convince to bungee the 4 corners. Its fun changing the temporary lettering portions on those banners!
Diane Balch
-------------------- Balch Signs 1045 Raymond Rd Malta, NY 12020 518 885-9899 signs@balchsigns.com http://www.balchsigns.com Posts: 1701 | From: MaltaNY | Registered: Jan 2000
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