Concrete Slab
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Joined: Jan 2004
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From: Franklin, GA
Length X Width X Height / 27 = cubic yards.
30ft x 26ft x 0.33ft (4" being 1/3rd of a foot) = 257.4 cubic feet
257.4/27 = 9.53333 cubic yards of concrete. Order 10 yards and run your entrance forms out front and use the extra for a entrance pad if you have more than enough.
30ft x 26ft x 0.33ft (4" being 1/3rd of a foot) = 257.4 cubic feet
257.4/27 = 9.53333 cubic yards of concrete. Order 10 yards and run your entrance forms out front and use the extra for a entrance pad if you have more than enough.
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Fleet Mechanic
Joined: Sep 2002
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From: Gretna ,LA.
Originally Posted by hdgapeach
Length X Width X Height / 27 = cubic yards.
30ft x 26ft x 0.33ft (4" being 1/3rd of a foot) = 257.4 cubic feet
257.4/27 = 9.53333 cubic yards of concrete. Order 10 yards and run your entrance forms out front and use the extra for a entrance pad if you have more than enough.
30ft x 26ft x 0.33ft (4" being 1/3rd of a foot) = 257.4 cubic feet
257.4/27 = 9.53333 cubic yards of concrete. Order 10 yards and run your entrance forms out front and use the extra for a entrance pad if you have more than enough.
aah, i was multiplying it by 1.3 instead of .3. Thanks
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Originally Posted by hdgapeach
257.4/27 = 9.53333 cubic yards of concrete. Order 10 yards and run your entrance forms out front and use the extra for a entrance pad if you have more than enough.
Most trucks carry 10 yards, and I've often seen them come up "short", at least by my calculations. If you are off a bit on your measurements, you may need more concrete. Tell them in advance that you may need another yard, but that you have measured carefully.
If your slab is really 3.5" thick, that's 8.4 yards, so you would have a little extra. If it's 4" and you have low spots (more than 4") you could come up short with 10 (4 1/4" deep would take 10 1/4 yards). Just make sure that 11th yard will be available so you don't have to have a cold joint.
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From: Drummonds, TN USA
Originally Posted by Mil1ion
81 sq ft x 4" thick takes ONE Cubic Yard.
(on edit) Oop! I just saw your correction.
~Okay, we're all rocket scientists here!!!
Last edited by Greywolf; Apr 11, 2005 at 10:25 AM.
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Although my estimate comes with 23 years experience.
Here is what the internet offers.
http://www.concretenetwork.com/concrete/howmuch/
Here is what the internet offers.
http://www.concretenetwork.com/concrete/howmuch/
