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RE: Fire Wall

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Fire Wall Follow up.

We are a BOCA 1996 region and the local building official has classified the
wall between the two buildings as a "BOCA Fire Wall".  Per BOCA this means
the structures (within the 2 hour window only) on either side of the wall
must be able to fall away without the fire wall collapsing. 

I understand that the advantage of classifying the wall as a fire wall
versus fire separation is 1) the county prefers a fire wall, 2) little
changes to the existing building, 3)  the fire rating does not have to
extend beyond the intersection of the two buildings.

It will be difficult to make the wall self supporting for 4 levels.  Does
any on have a lead on the breakaway anchors?
from the desk of
Thomas A. Bouffard
Ehlert/Bryan, Inc.
1451 Dolley Madison Blvd
McLean, VA  22101

(703) 827-9552 voice
(703) 356-2031 fax

-----Original Message-----
From:	WILLIAM R. KEEN [mailto:wrk(--nospam--at)]
Sent:	Friday, November 20, 1998 2:55 PM
To:	mail@ih {seaint(--nospam--at)}
Subject:	RE: Fire Wall

I don't think you have to allow the building to collapse on either side of 
the fire wall unless it's classified as a building separation wall. You 
should check with the architect to determine whether it's classified that
in the code. I can't remember having to treat a 2 hour wall this way. I 
remember always having 4 hour walls at building separations, but the fact 
that it's a concrete structure may have something to do with it (area also).

If it is a building separation wall, and you need to isolate the wall, there

are manufacturers that make "break-away" connections that allow the
to fall away and leave the wall standing. Be careful not to rely on
to brace the wall if you intend for the structure to collapse in a fire.

William R. Keen, PE
Director, Structural Engineering
Clark Nexsen
Architecture & Engineering
6160 Kempsville Circle, Suite 200A
Norfolk, Virginia 23502
757 455 5800 Fax: 757 455 5638

-----Original Message-----
From: Bouffard, Tom On Behalf Of Bouffard, Tom
Sent: Thursday, November 19, 1998 10:46 AM
To: Seaint (E-mail)
Subject: Fire Wall

I have a job (low seismic risk, Av=0.05) that requires a 4 story, 2 hour
rated fire wall between a new 7 story addition and the existing 4 story
building.  Both the buildings are 2 hour rated concrete framed buildings.
We plan on using a masonry fire wall and would like to brace it to the new
construction.  Does anyone know of any type of attachment that would be
appropriate for these connections.  Based on the fire wall principle that
either building should be able to collapse without the fire wall loosing
it's ability to perform.

Tom Bouffard