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Found out a standard 80 lb bag of concrete only gives you about 0.6 cubic feet, and my truck math was way off
I was loading up for a small slab job down in Fresno a couple weeks back and the guy at the counter told me an 80 lb bag only pours about 0.6 cubic feet. I always figured it was closer to a full foot, so I had been way under buying for years on small pours. Ran the numbers on a 10 by 10 pad at 4 inches deep and it worked out to 33 bags, not the 22 I had in my head. That is a big gap when you are mixing by hand with two guys and a wheelbarrow. Now I keep a little card in the truck with the right bag count for common slab sizes. How do you all figure bag counts on small jobs, or do you just order ready mix and skip the headache?
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