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# Calculating square footage for concrete

#1
04-03-15, 05:21 PM
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Join Date: Feb 2014
Location: usa
Posts: 13
Calculating square footage for concrete

can anyone tell me how much concrete it will take to pour the following area: along front it is 24' long, one side 42' long, the other side is 34' long, back is 4' wide and will be 4" deep.
Called 2-different concrete places and both came up with different yards, app. 2 yards different between them.

#2
04-03-15, 05:44 PM
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#3
04-03-15, 05:53 PM
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Join Date: Jan 2010
Location: North East Kingdom of Vermont
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I got only 6.57 Cubic Yards.

This by averaging the sides and multiplying:

38' X 14' X .3334' = 177.37 Cubic Feet ÷ 27 = 6.5692 Cubic Yards.

So I'd order a minimum of 7 Yards.

Also, 4" thick is kind'a thin; are you using reinforcement rods ?

#4
04-04-15, 05:25 AM
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Join Date: Feb 2006
Location: USA
Posts: 6,351
Square footage

Not enough information. Please post a diagram of the area. Your description does not make sense.

#5
04-09-15, 01:26 PM
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Join Date: Dec 2013
Location: usa
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4" is generally a std thickness for driveways, patios, & sidewalks,,, IF you choose to add rebar, aci recommends 2" of conc above AND below the bar so you'd need 4 1/2" thick slab to comply,,, adding steel is ok BUT random cracking can generally be avoided by a properly laid-out & installed joint pattern for MUCH less \$\$\$,,, we rarely use either rebar OR wire mesh

got 6.57 cy, too,,, IF this is an exterior slab, don't forget to add ' air '