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SkunkedAgain

Does anyone have first-hand experience drilling into Vermilion bedrock? I need to pin some piers onto a slope, which shouldn't be that difficult. I'm just wondering if a regular hammer drill and some diamond bits can hollow a big enough hole for rebar or if I need to borrow a corded rotary drill. I've never drilled into Canadian shield rock before.

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CigarGuy

When we did my new steps, all we used was a hammer drill and mason bits. We pegged 1/2" rebar into the bedrock and drilled a hole into the 4x4 posts. I'll bet we drilled a total of 10-15 holes into the bedrock. Set the post where it needed to be, sprayed the area around the base with spray paint, drilled in the middle-worked great! Oh yah, we cut the rebar down to about 8".  

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Pat McGraw

I grabbed a hammer drill (larger corded) from the rental place on the east side of 169 at the north end of Virginia and drilled a hole for 3/4" stainless bold as a footing pin. Was surprised how soft the rock seemed to be.

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SkunkedAgain

That's encouraging. Obviously rock can vary from spot to spot but there is some relatively consistent geology.

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