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- Subject: Not a Structural Question, but maybe someone on this list can help
- From: "Bill Allen" <T.W.Allen(--nospam--at)cox.net>
- Date: Thu, 1 Jun 2006 08:10:51 -0700
I’m working on a project which is a one story wood framed structure in California. It’s rated as Type V One Hour Sprinklered. There is an interior exit corridor which is a one hour rated corridor. The wall is load bearing and has TJIs hanging off one side and 2Xs hanging off the other side (in the corridor). There is one layer of Type X GWB on each side of the wall. There is no issue at the roof framing as the GWB runs between the roof framing and the contractor will caulk between the roof joist members.
This is a detail on the approved plans which the building official has agreed to: http://www.allendesigns.com/projects/20411/Detail23SheetA92.jpg
The issue is at a lower ceiling in the corridor. The contractor installed the ledger to the studs and interrupted the GWB. He is willing (and originally intended to) fire caulk the joint between the interrupted GWB and the ledger.
Here is a sketch of the proposed change: http://www.allendesigns.com/projects/20411/Detail23SheetA92-Alternate.jpg
The building official is unwilling to accept this change without the architect changing their detail. Rightfully so, the architect is unwilling to provide a detail which has not been documented to be acceptable as a one hour rated assembly. However, I believe this condition happens often.
The question is this: Does anyone know of a published approved method of interrupting the GWB on a one hour interior wood framed wall?
Of course, another option I thought of (although I am no means an expert in fire rated assemblies), is to consider the lower corridor ceiling the bottom of the fire rated ceiling, but I’m not sure if that is possible.
T. William (Bill) Allen, S.E.
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