If possible, put a piece of plywood on one side as a backer. Run some tapcon screws or similar half way in, all around the opening. This gives something for the mix to hold on to. Make the mix very dry so it won't run all over the place.
Filling hole in slab
I have a hole in the slab foundation of my house. It is only about 3 inches down and 9 inches wide. Do I just fill it with Quickcrete and thats it? Thank you
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