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Remodel and New Build GC
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YEP.... Drilling rock can be very difficult as different rocks can be very dense and hard.

Can't see your drill....is it a full hammer drill with SDS bits...or one of those "hammer" drills that just has a little cam rotation. You may not be able to drill certain rock, but a bosch bulldog SDS rotary hammer may do it..

Not sure why you'd be drilling 1/2 holes for tapcons...????

How about glueing those timbers in.????
 
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