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Oct 12, 2017 at 2:11 comment added thatguy I believe they are digging under the patio and up through the gravel in the void. Once in the void, there are small gaps between the plywood under the joist, the rim joist, and the concrete block of my basement wall. The space I have to work in for this is only as tall as the joist height (assuming 10 inches) . It would be difficult for me to get in there to drill holes in to the old concrete to connect it to the new concrete. Is that a problem?
Oct 11, 2017 at 10:34 history answered Merrill M. Meyers Jr. CC BY-SA 3.0