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Core Hole Through PT Slab

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At one of our projects, the contractor needs to core some holes through the structural slab. The slab has both PT cables and regular reinforcing. Cores are from 2" to 4" in diameter and are 16" to 20" apart in both directions. We are not allowing them to cut any of the reinforcing. However, I am trying to give them a guideline as to the distance from the edge of the cores to the edge of the reinforcing. I remember a 1" dimension had been discusses in the past. Is that sufficient? Any thoughts?
 
Thank you,

Farzin S. Rahbar, SE
David C. Weiss Structural Engineer & Associates, Inc.
(818) 227-8040 Ex. 13 Fax: (818) 227-8041




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