core drill hole spacing
core drill hole spacing
(OP)
three 6",four 3", three 4", below grade in foundation wall?
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RE: core drill hole spacing
Assuming the wall is not heavily loaded - That is the removal of the holes does not in itself overstress the wall - I'd position the holes at 4x diameter, using the larger hole size. There is no real justification for this, I adopted my old boss's detail.