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Recreational Mechanic
Join Date: Sep 2000
Location: Northern Colorado, USA
Posts: 3,326
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I did the exact thing last summer. Large pergola over existing slab. Concrete guy dug 4 foot cassons at the corners of the existing slab, inserted cardboard tubes and rebar, then filled with concrete to form the post supports. I would say if you don't know how thick or what's under the existing slab (rebar, etc) then this is probably the best solution.
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