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roto-hammers, masonry & city of LA

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we are planning on using a 'helifix' anchor system
to retrofit a masonry building. The installation of these anchors
requires the use of a pre-drilled hole in the mansory.
During conversation with the anchor manufacturer, he stated 
that the City of LA does not allow the use of impact or 
roto-hammers on masonry retrofits. -This seems a bit restrictive.
Has anyone heard of this? - if so, could you explain why?

thanks in advance,

Tim Terich
Century West Engineering Corp.
825 NE Multnomah, Suite 425
Portland, OR 97232
v(503) 231-6078 f(503) 231-6482