How much concrete needed for 35 sq ft?

i was looking at the back of a bag of quikcrete and it says i need 25 60# bags. that seems like a lot, but is that right. is there a better way to make a 35 sq ft slab 4 inches, thick

Asked By: Sharon D - 6/10/2008
Best Answer - Chosen by Asker
Sorry, hunny, but your math is wrong. 35 sq. ft. at 4" thick is 11.67 cu. ft. (35/3=11.67). A 60 lb. bag of Quikrete equals approximately 1/2 cu. ft., so 23-25 bags is correct. It's less than 1/2 yard (27 cu. ft. is a yard), so it definitely would cost you a lot to have a redi-mix truck deliver it. If you can rent... More
Answered By: woodtick314 - 6/10/2008
Additional Answers (3)
I use this when I need it...
Answered By: Bammer - 6/10/2008
The easiest way would be to call a concrete company and have a load of concrete delivered. Otherwise rent a cement mixer and use that. You could always do it the hard way, mix it by hand, but you're going to be there a long, long time.
Answered By: wolfatrest2000 - 6/10/2008
A 35 sq. ft. slab 4" thick will take approximately 4 cubic feet of concrete. A commercial firm will not likely deliver that small a quantity. According to the Quickcrete website, a 40 lb bag yields approximately 0.3 cu.ft. . Therefore you will in theory require about 13, 40-lb bags of Quickcrete. In practice, you... More
Answered By: honeylulu2 - 6/10/2008
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