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3. I would make a mat of #3 or #4 bars 8" a part but you need to drill holes into the edge of the existing slab to tie the new walls to the slab
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Thing is most residential garage slabs I have seen are 4" ... so nothing for him to drill into.
When we did Bills new shop the slab was 6" so I recommended that the contractor undermine the slab a bit as a "key"