posted
I am doing my first banner that will be installed over a main road. The banner is 4'x25',but I don't know what size and how many vents should be cut in the banner. I am lettering the banner on both sides.The banner will be mounted between two poles by someone else because I don't want to get involved in the legal mumbo-jumbo! Thanks in advance.
-------------------- Phil Swanson Lake George Lettering 151 New Hague Rd. Hague, NY 12836 lakegeorgelettering@yahoo.com Posts: 24 | From: 151 New Hague Rd. Hague, NY 12836 | Registered: Oct 2005
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Do not cut wind vents in your banners. In case you forget, DO NOT cut wind vents in your banners. Ever. Remember, do not cut wind vents in your banners. Not ever. Don't do it.
The benefits of reduced wind load are far exceeded by the potential damage you will cause to the banner. The reduction of the wind load will not be what you expect. If the customer insists, give them a template and a knife and tell them to have it.
If wind load is an issue, you should really consider the possibility of using a printed mesh banner. The cost will be considerably more bot the benefits are good. The downside is that they just don't look as good as a solid background because the tend to look a little washed out.
-------------------- Bruce Bowers
DrCAS Custom Lettering and Design Saint Cloud, Minnesota
"Things work out best for the people who make the best of the way things work out." - Art Linkletter Posts: 6451 | From: Saint Cloud, Minnesota | Registered: Jun 1999
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Unfortunately, many misled over-educated city officials require wind slits. If that is the case, sell them the banner, and let them insert their own wind slits. Of coarse, this voids the warranty immediately.
Edited to ad that this seems to cmoe up from time to time. Check this out. Many previous posts address this issue in depth.
[ November 17, 2005, 01:23 PM: Message edited by: Rick Beisiegel ]
""Good judgment comes from experience; and a lot of that comes from bad judgment" - Will Rogers Posts: 3485 | From: Beautiful Newaygo, Michigan | Registered: Mar 2003
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Hiya Philip, A 4' x 25' banner is huge for this type of application. Have you confirmed with an engineer that the structure you're attaching the banner to can support the wind load? Also, check with your banner manufacturer to see what they recommend. I know that some say it's O.K. and others will say that it voids any warranty. I'm with the the others, I don't like them and don't use them unless it's required by the city or the client insists.
Havin' fun,
Checkers
-------------------- a.k.a. Brian Born www.CheckersCustom.com Harrisburg, Pa Work Smart, Play Hard Posts: 3775 | From: Harrisburg, Pa. U.S.A. | Registered: Nov 1998
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ditto to what Checkers said. Let the installer tell you what weight banner material and make sure to get the edges hemmed with tape (flat webbing) and not just plain hemmed. If you're just supplying a banner to their specs and you're not installing it, then you're fine.
oh, and dont cut slits in the banner.
-------------------- :: Scooter Marriner :: :: Coyote Signs :: :: Oakland, CA :: :: still a beginner :: :: Posts: 1356 | From: Oakland (and San Francisco) | Registered: Mar 2001
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And double what checkers said. I saw pictures in Sign Business (I think) where the wind load on a big across the street banner pulled over a light pole.
Street light poles are made to carry their own wind load, not that of a banner that size.
The windload on that banner is going to be 26 lbs per square foot or 2600 lbs!!! Wind vents will only knock the wind load down to 2418 lbs. at best. Mesh banners drop the load down 15%.
If the mounting structure will take the load, keeping the banner taught will make it last longer than cutting it up.
-------------------- Dave Sherby "Sandman" SherWood Sign & Graphic Design Crystal Falls, MI 49920 906-875-6201 sherwoodsign@sbcglobal.net Posts: 5397 | From: Crystal Falls, MI USA | Registered: Apr 1999
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If you cut wind holes...this voids any manufacture warranty... now here's something to think about... average wind holes when ask to do...
6 inches by half/moon, circle whatever you want to call it.
you would need 4 cuts to decease by 1 square ft.
Take your average over the street banner...say... 4' x 25' = 100 sq.ft. 4 - 6-inch cuts = 1 sq.ft
Can you see what I'm getting at... lots of holes...will lead to lots of problems...
We make thousands of banner here every year...I've been doing this for 20+ years...every body has there own idea how to make a banner...but for us...we start with...
18oz PVC banner with block-out 5/16 inch aircraft cable is wrapped with 2.5" webbing sewn into the banner / 6" loops on the ends secured by clamps...
posted
At one time I read where the wind holes only reduce 2 percent, put tons up over the years never cut any of them. I agree save your self a headache and leave it be.
-------------------- Al Checca Kidney dialysis Pt. wizard42171967@yahoo.com Posts: 261 | From: Latrobe just outside Pittsburgh Pa in Latrobe | Registered: Aug 2001
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Why not just hang a couple midgets from harness swings off the bottom of it. That way they will control the wind load and also give a great show if it does get a little breezy
(Visualize people....it could be quite entertaining)
Necessary evil....but banners sux
-------------------- Snow's Sign Works 865-908-0076 snowman@planetc.com www.snowsigns.com
I'm out of my mind, but feel free to leave a message... Posts: 1640 | From: Sevierville, TN | Registered: Jul 2005
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Obviously you already have the info you need...and from several pros and Cambridge Canvas no less! Mr. Holzhauser should know.
Good luck with convincing the customer.
I had this arguement with Island Authority several times. Even showed them the recommended installation method from the banner manufacturer...no help.
They had spent lots of money installing two poles on either side of the street...that's it, no cables, nothing. They required a 5'x30' banner, with 36 6inch wind vents, and half inch rope sewn into the hems with 50' extending from each corner. These spec were created by the Island Authority with no professional input, just the maintenance guys.
We made a banner for a customer following the specs, and when it came down only the second time it had been installed, they came screaming to us.
When we checked the install, this is what we found: The road the banners stretch over is four lanes plus a median. This means lotsa rope between the banner and the poles...which causes the banner to close up like a clam, top to bottom, with little or no wind. To remedy this, the geniuses at the Island Authority attached 1x4s up each end of the banner with screws through the hem. By the time they had installed it a second time (same method), they had perforated both ends...and just couldn't see how that would have been a problem.
The banner was remade, I can't remember who ate the cost, but it sure wasn't us!
-------------------- Joe Endicott NEXCOM (Navy Exchange Service Command) Signing Programs Specialist Virginia Beach, VA jeendicott@msn.com
"I want to be Stereotyped....I want to be Classified." Posts: 681 | From: Virginia Beach, VA USA | Registered: Mar 1999
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