posted
We are installing a 5'x8' Lighted cabinet thats only 3' off the ground so from ground level to top of sign is 8' with a 36" pole cover below. We are setting a 4.5" square steel pole in ground. Is a 24"x32"x32" deep footer enough?
-------------------- We get you noticed Henry Edmonds X-treme Signs & Graphics South Hill, VA xtremesigns@yahoo.com Posts: 142 | From: South Hill, Va. | Registered: Jun 2001
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Hiya Henry, Without doing the math, my gut instinct says no.
However, I'm not an engineer and I'm in a climate where footings need to be at least 36" deep per code to get below the frost line.
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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That's only a little over half a yard of concrete. It doesn't sound like enough to me. I did one amost identical to that which was 3' off the ground but was 5 x 10. If I remember right, I used 1.5 yards.
40 sq ft @ 26.5 lb/psf = 1060 lb lateral windloading at 120 mph. The book; "Sign Structures and Foundations" has all of the formulas you need, I could calculate the amount of concrete for you, but my book is at the house right now.
[ September 22, 2011, 09:57 AM: Message edited by: Wayne Webb ]
-------------------- Wayne Webb Webb Signworks Chipley, FL 850.638.9329 wayne@webbsignworks.com Posts: 7403 | From: Chipley,Florida,United States | Registered: Oct 1999
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-------------------- We get you noticed Henry Edmonds X-treme Signs & Graphics South Hill, VA xtremesigns@yahoo.com Posts: 142 | From: South Hill, Va. | Registered: Jun 2001
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posted
Probably around 1.25 yards but that is just guessing. To get 1.25 yards you could make your foundation something like 45" long x 36" wide x 36" deep. But like I said, I would recommend the book "Sign Structures and foundations" because it has the formulas you need. I would use mine to calculate it for you but it's at home.
posted
Wayne is right. There are so many variables. Your minimum pole depth is dependent on your local code. That is going to determine the amount of concrete you need. From the Sign Structures and Foundations book, you can even calculate the amount of concrete you need to have the concrete sitting on the surface. The deeper you dig, the less concrete you'll need. This is where the formulas in the book work so well. The formulas consider the depth which correlates with the resistance the earth provides along with the weight of the concrete.
-------------------- Dave Sherby "Sandman" SherWood Sign & Graphic Design Crystal Falls, MI 49920 906-875-6201 sherwoodsign@sbcglobal.net Posts: 5396 | From: Crystal Falls, MI USA | Registered: Apr 1999
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By the way, the book is worth the price. Every time I've needed an engineers stamp on a sign like that, they told me my calculations were right on the money. So when I do one that doesn't require an engineers stamp, I'm confident that my install will be safe.
-------------------- Dave Sherby "Sandman" SherWood Sign & Graphic Design Crystal Falls, MI 49920 906-875-6201 sherwoodsign@sbcglobal.net Posts: 5396 | From: Crystal Falls, MI USA | Registered: Apr 1999
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I just ordered the book. I already had "engineering sign structures" but this looks like a good read too. thanks
-------------------- Jerry VanHorn, Pres. Pure Sports Designs, LLC Pro Sign Design / United Wholesale Signs www.prosigndesign.comwww.unitedwholesalesigns.com West Liberty, OH 937-465-0595 866-942-3990 Since 1990 Posts: 925 | From: West :Liberty, OH | Registered: May 2004
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