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I need some help trying to find how big of a concrete foundation one would need for a sign that is 5'x10' and 15 feet off the ground(single pole).
Is there some kind of a chart that shows the size of foundations of high rise signs?
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Dave, Glenn Taylor posted some past issues of sign craft that had the charts. I can't remember the issues, if you don't have them e-mail me and I'll be happy to copy them for you.
Do a search for glenn's post it wasnt that long ago.
-------------------- Bob Rochon Creative Signworks Millbury, MA 508-865-7330
"Life is Like an Echo, what you put out, comes back to you." Posts: 5149 | From: Millbury, Mass. U.S. | Registered: Nov 1998
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My chart shows- circular footing 2' round, 6' deep .7 yds concrete rectangular - 4'X6'X2' deep 1.8 yds concrete
My charts are pretty old, but they haven't failed me yet. Also, if ever you run into to the issue of stamped engineered drawings being required for permitting reasons there is a great firm in Knoxville, Tn that can do them for about $150. You can find them on the web. Micheal Brady, Arch.
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Most states go by the National Standard Building Code (I think thats the Proprer Name) But I do know in our area it does have to be Wet Stamped by a State Licensed engineer to meet Exposure C with windload to 85mph.
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In my neck of the woods...about 3 yards of concrete because we have 110mph windload. Where you live it may be slightly less but you have frostline to deal with so your hole would need to be at least 42'' deep.
-------------------- Wayne Webb Webb Signworks Chipley, FL 850.638.9329 wayne@webbsignworks.com Posts: 7404 | From: Chipley,Florida,United States | Registered: Oct 1999
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I have always had to submit specifications stamped off by a engineer to get a permit for a sign of this size
Posts: 445 | From: Slidell, LA | Registered: Feb 2004
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Signs of the Times Magazine has an excellent engineering guide in their bookstore. "Sign Structures and Foundations", by Peter Horstley. ($24.95) You may have to brush up on your math to use the formulas, but it's a very comprehensive guide that covers just about everything you need to know.
There is really no "one size fits all" guide available because there are too many variables, such as required wind loads, soil density, etc. I used that book for many years, and it really saved me a lot of money. I was able to do my own engineering and then take my figures to a licensed engineer who would check the figures and sign off the plans for a fraction of what it would have cost, had he done all the engineering himself.
-------------------- Jerry Mathel Retired Grants Pass, Oregon signs@grantspass.com Posts: 916 | From: Grants Pass, OR USA | Registered: Dec 1998
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Years ago, when I was engineering billboards down south, I had access to an excel spreadsheet that you could plug all the info into, and it would spit out what you needed for the sign...pole size and section mod. concrete size for 2 different type of holes... pretty complete.
The only thing is, I still have it, but it's on a tape backup, and I don't know anyone that has one.
So, I guess my question is, does anyone has access to a tape backup drive that uses the 3M TR-1 Minicartridge. I could ship it to them, they can get the spreadsheet off, and I can post it up for everybody to use...
-------------------- Mark Kottwitz Kottwitz Graphics Ridgely, MD www.SeeMySignWork.com -------------------------- Imagination is more important than knowledge. -- Albert Einstein Posts: 746 | From: Ridgely, MD | Registered: Oct 2000
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