I need to drill a couple of 4 inch holes in a concrete catch basin. I’m assuming the 8 inch thick walls have rebar in them. How much edge distance should I allow for a 4 inch hole in an 8 inch concrete wall to avoid cracking ? I’m leaning towards 12 inches, but not sure.
thanks,
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Replies
I'm not gonna be any help............
but it might bring your question up top again.
Me? I'd call Duffy Concrete Cutting and tell them to have at it.
The concrete drilling contractors use a diamond hole saw. It cuts easily and clean. There isn't any significant vibration or shock to the concrete. It's not like they will be using a jack hammer.
Contract it.
I had two 3" holes cored in a foundation wall for $120. Could have been 4 or 5" holes and as many as five of them for the same price. I'm 45 miles from the nearest company that could do the work and I think they spent more in windshield time than they did on the job.