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Unread 07-28-2011, 04:54 AM   #12
bbcamp
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Join Date: Jul 2002
Posts: 30,274
Fill the hole with a coarser material than sand. (Coarse sand is OK if you have no other options. You can use the dirt from the hole if you are willing to layer it in 2 inch layers and pack the hound out of it between layers.) Use crusher run gravel (un-graded, un-washed gravel) if you can get it in a small quantity. Lowes (and likely, HD) has something similar in bags called compactable base (or something) that's used under paver patios. Fill to the bottom of the old slab, compacting it with the end of a 2x4 or something. Top off with concrete mix with some thinset spread on the cut edges of the old slab to act as a bonding agent.
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