Calculating square footage for concrete


Old 04-03-15, 06:21 PM
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Unhappy 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.
Thanks in advance for help
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Old 04-03-15, 06:44 PM
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Old 04-03-15, 06:53 PM
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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 ?
Old 04-04-15, 06:25 AM
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Square footage

Not enough information. Please post a diagram of the area. Your description does not make sense.
Old 04-09-15, 02:26 PM
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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 '
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