I am framing a elevated deck that will be covered with 4 inch exposed agg. concrete. I was told that concrete weighs 4000 lbs per cubic yard. I think that I did the math right making a 4 inch slab about 50 lbs per square foot. if I am spanning ten feet what size joist would you use and on what centers? I am planning on a 3/4 inch pressure treated sub-floor under the concrete. Any math people that could check my math would be great.
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