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Re: Mount Zion Hospital bldg Grant St, San Fran, Ca

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22.5 degrees is required by law. Table 16C-E. The holes are required to be 2.5" in diameter. It allows the grout to be poured in and not slop out. It allow more bonding area in the wall and enlarges the theoretical pop-out cone when failed.
 
David Merrick, SE
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