Bricks, Masonry, Asphalt and Concrete - stone (type?) under concrete slab

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bnowatzk
04-08-03, 01:09 PM
I am preparing a dirt surface for a slab pour in a basement. When I called to order stone, I am given a choice of 1 inch clean or 3/4 inch (not clean). I assume that the 3/4 with debris will pack better. is this true? Is this what I should order?

Thanks,
Bill

YankeeCraftmn
04-10-03, 07:37 PM
Here in N.C. we use #67 under our slab because it compacts better. #67 is a mix of 1", 3/4" and smaller stone. It takes very little to compact. It is a washed stone. I would definitely use 2" of stone in a basement with the grade pointing to a sump area, the stone allows water to pass through without backing up.