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Re: Retaining wall Exposed to Fire

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> Michelle Kam-Biron, S.E.
> Ventura, CA


Rely on the "old" California plaster nail test, scratch the masonry
units and the mortar joints very firmly with a 20d Common nail.  Nothing
should spall off.  If some spalling occurs, use your own engineering
judgement, too much results in a rejection!!
 
Donn Wooldridge RA/SE
Phoenix, AZ