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RE: Firewall Connection

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I have seen this done two ways.  

1.  Provide 2 doors separated by a door swing plus an ADA distance.  This only works where you have an alcove or a corridor.  What you do is build the majority of the length of the 2 firewalls as you normally would.  When you come to the opening the wall steps away by the distance mentioned.  The is for the below ceiling condition.  Above the ceiling the wall doesn't change.  At the ceiling you build a concrete slab.  We usually call this one the tunnel method.

2.  Build walls in usual manner.  At the door you provide CIP columns and a beam/slab at the ceiling.  Inside this you  provide only one door.  The thinking on this is that the CIP is freestanding.  It's built bombproof.  On the top level of the CIP beam/slab you provide a sloping surface with felt.  The block firewalls are built on top of the sloping surface.  The sloping surface looks like the ridge of a roof with the ridge parallel to the wall and between the block wythes.  The thinking is that if there is a fire and it pulls the block then you are helping it do so with the slope.  Your structure below is built where it is "bombproof" and won't move.


Follow-up question:  What do you design the walls for, especially a cantilever?  I have seen some folks design this for the 5psf interior wall condition and equake.  We use a full code wind load and check equake.  Reasoning is that IF the structure comes down this wall will be hanging in the breeze for a while, possibly forever.

John C. Jones, PE
Barnett Associates
Pell City, AL
205-884-5334
205-884-0099 (fax)


-----Original Message-----
From: Rick Burch [mailto:rburch(--nospam--at)conterra.com]
Sent: Wednesday, July 14, 2004 6:40 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Firewall Connection


Jim, and others who mentioned using double walls,

Here is a question  that has always puzzled me, and which I posed the 
last time  the firewall question came up on the list:
What do you do at door openings through the double walls - put doors in 
both walls? I know some firewalls might not have openings, but it seems 
that all of them I have encountered had door openings. I don't think I 
have ever seen two sets of doors right up against each other however, 
like would be required in a double wall.

Rick Burch
Columbia, SC





Kestner, James W. wrote:

> I would recommend using a double firewall in this instance.
>  
> Jim K.
>  
>


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