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rbowman

On 02/16/2020 08:50 PM, wrote:
OK, what's the trick. This stuff just laughs at a Tap Con bit in a
hammer drill (the carbide tip ends up melting) and if you try to shoot
a tap con screw in it, you get a nail. It wipes out the threads. I
just bought some Bosch super bits ($10 a pop) and I am trying them
tomorrow. They say they will eat concrete with rebar in it.

Diamond drills and a lot of patience. Being able to use a drill press
helps but I doubt that's an option for you.