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Re: Lath and plaster shear walls

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What you are describing is Exterior Insulating Finish System (EIFS) not lath and plaster, and it is not a structural system suitable for shear walls. Joe Venuti is correct on the load resistance mechanism.

Check out
There are illustrations that probably show your system.

Harold Sprague

From: Jnapd(--nospam--at)
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: Re: Lath and plaster shear walls
Date: Wed, 15 Nov 2006 13:22:22 EST

In a message dated 11/15/2006 8:28:14 AM Pacific Standard Time,
jrgrill(--nospam--at) writes:

I guess it never ends as to what will be seen. I was called to a site where a remodel is under construction. The house is probably 20 to 25 years old. The exterior walls were constructed with foam panels over the studs and then
woven wire lath and plaster over the foam.  I'm not super  familier, but I
wouldn't think this is a proper exterior system.  The IBC  lists a portland
cement plaster with shear wall values, but what is the entire  system
requirements? Fastener sizes are shown. Is there some backing required? I guess I'm
looking for some direction here.  Is  there any texts, mfg. data, industry
Any Help.
Joe Grill


Valuse in the code are for Plaster being directly attached to the  studs.
Otherwise you have to design the fastners for the cantilever through the foam.

Joe  Venuti
Johnson & Nielsen Associates
Palm Springs,  CA

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