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1994 UBC Section 709[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: SEAOC <seaoc(--nospam--at)seaoc.org>
- Subject: 1994 UBC Section 709
- From: "Burch, Daniel" <DBURCH(--nospam--at)paragonstr.com>
- Date: Wed, 7 Jan 1998 08:45:00 -0800
- Encoding: 21 TEXT
I would like to solicit anyone's opionions or experiences with the following subject matter. Recently we were told by our local building official that for the case where a steel framing member penetrates a rated fire wall (CMU construction) that the minimum thickness as specified in table 7-B must be maintained behind the member. For example an 8", 1 hour wall is required to have an equivalent thickness of 2.7". Thus the face shell on the back side does not satisfy. Section 709.2 provides the requirements for a "combustible member" framed into a rated wall to maintain half of the required thickness behind the member. The intent of this section is expanded upon in "HANDBOOK to the Uniform Building Code". Also sections 709.6 and 709.7 address penetrations in fire rated walls. All of the exceptions and standards seem to address penetrations for mechanical and piping. It seems that somehow there must be a way to justify, through code provisions, a beam or joist bearing on a masonry wall (whether it stops or continues through) without having to build up the back of the cavity or face mounting. Any helpful comments would be appreciated. Dan Burch
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