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RE: Seismic compression struts

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The CISCA Guidelines and ASTM E580 both require compression struts at splay
wires.  USG Seismic ceiling resource center lists
code requirements in the CISCA guide and has .pdf and .dwg details.

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)] 
Sent: Wednesday, August 19, 2009 8:26 AM
To: seaint(--nospam--at)
Subject: RE: Seismic compression struts

You are correct.  CISCA references the splay wire and compression strut in
"Guidelines for Direct Hung Ceiling Assemblies in Seismic Zones 3 & 4".
There were some studies a while back that indicated that the lateral drift
was too great to reduce damage if splay wires were used without compression

Regards, Harold Sprague



Subject: RE: Seismic compression struts
Date: Tue, 18 Aug 2009 11:58:05 -0400
From: mmotchos(--nospam--at)
To: seaint(--nospam--at)

I believe the compression posts come from ASCE's reference to "CISCA for
Zones 3 & 4" for installations in D-F buildings. I don't have a copy of that
to verify current requirements.


From: xmy978(--nospam--at) [mailto:xmy978(--nospam--at)]
Sent: Tuesday, August 18, 2009 11:34 AM
To: seaint(--nospam--at)
Subject: Seismic compression struts

Does the CBC 2007 (IBC2006) still require seismic compression struts for
suspended ceilings? I cannot find it in the code?








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