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you can just inject hydraulic cement into the void and let cure. then anchor your flange with a tapcon type screw. or just inject the hydraulic cement and then insert a screw into the wet cement. when it cures, it will lock the screw in place.


The 4" to concrete figure you see is a minimum clearance value, and really has nothing to do with the size of the footing required to support a load or prevent twisting or uplift. The size(volume) of the footing is what your engineer calculates out to have adequate mass to support/hold down your structure. One thing I noticed on the spec sheet you linked to:...

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