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Re: roto-hammers, masonry & city of LA

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Roto-hammers (Impact tools) are expressly forbidden in URM work. The reasons
should be obvious. Impact tools can damage and loosen surrounding mortar
capacity and weaken the walls. The code is very specific about the use of
Impact tools in Unreinforced Masonry. The conventional methods us simple
rotary drills with carbide or diamond bits to drill holes.
I have gone as far as to prevent the use of a jackhammer anywhere near a URM
wall for fear that it will weaken the bond between the mortar and the brick.

Dennis Wish PE

-----Original Message-----
From: Century West Engineering Corp. <cwec(--nospam--at)>
To: seaoc(--nospam--at) <seaoc(--nospam--at)>
Date: Monday, January 12, 1998 11:02 AM
Subject: roto-hammers, masonry & city of LA

>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