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Old 07-05-2006, 09:41 PM   #1
bhays
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Default thickness of concrete slab to weight load?

This is a bit off-topic, but I know that several of you have just gotten done with concrete floors and thought perhaps you could answer my question. I need to pour a 4' x 4' slab in my front yard to set a new fountain on. The fountain weighs about 1200 lbs...

I was planning on pouring a 4" thick pad with Sakrete...will that be sufficiently strong? Thanks for any advice.
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Old 07-05-2006, 10:28 PM   #2
boiler7904
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Default Re: thickness of concrete slab to weight load?

My initial reaction is that 4" is good (5" or more would be better) but i have two quick questions:

1. What is the actual footprint of the fountain? A 1' x 1' footprint is 1200 (weight you list) lbs per square foot. A 2' x 2' footprint is 300 (weight you listed divided by 4 square feet) lbs per square foot. A big difference when designing a slab.

2. Does that 1200 lbs include the water? If not you'll also need to know water capacity and multiply by 8 lbs per gallon.
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Old 07-05-2006, 11:05 PM   #3
sayemthree
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Default Re: thickness of concrete slab to weight load?

Quote:
Originally Posted by bhays
This is a bit off-topic, but I know that several of you have just gotten done with concrete floors and thought perhaps you could answer my question. I need to pour a 4' x 4' slab in my front yard to set a new fountain on. The fountain weighs about 1200 lbs...

I was planning on pouring a 4" thick pad with Sakrete...will that be sufficiently strong? Thanks for any advice.
one, add a 10 GA welded wire mesh for steel reinforcing in the middle of the slab as you pour it. or #3 repars at 12 iches oc.

otherwise 4 inches is fine. since the fountain is 1200 # devided by a 16 square foot footprint your soil pressure is only 75 pounds per square foot - far less than the 1000 normally allowed.

also as siad below, concentrated load of the fountain base can be determined - normal concrete is 1500 psi but you can order 3000 if you need it.
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Old 07-06-2006, 06:33 AM   #4
bhays
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Default Re: thickness of concrete slab to weight load?

Quote:
Originally Posted by sayemthree
one, add a 10 GA welded wire mesh for steel reinforcing in the middle of the slab as you pour it. or #3 repars at 12 iches oc.

otherwise 4 inches is fine. since the fountain is 1200 # devided by a 16 square foot footprint your soil pressure is only 75 pounds per square foot - far less than the 1000 normally allowed.

also as siad below, concentrated load of the fountain base can be determined - normal concrete is 1500 psi but you can order 3000 if you need it.
Thanks!. This is the fountain: http://www.krupps.com/Garden-Fountai..._krsam3795_0_0

So, a 4x4 pad 5" deep will take how much concrete (how many bags of sakrete)?
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Old 07-06-2006, 06:57 AM   #5
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Default Re: thickness of concrete slab to weight load?

Online calculator for doing just that: http://www.quikrete.com/calculator/calculator.html

Of course, they only have for 4" and 6" slabs (standards). So plug your numbers in to each and then split the difference for 5".
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Old 07-06-2006, 04:01 PM   #6
sayemthree
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Default Re: thickness of concrete slab to weight load?

Quote:
Originally Posted by bhays
So, a 4x4 pad 5" deep will take how much concrete (how many bags of sakrete)?
you will have to read the manufactuerers specs on that.
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