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RE: 1/2 inch gap under bottom chord

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Title: 1/2 inch gap under bottom chord

I use Simpson’s anchors for similar conditions also. However, the fine print says that these anchors rate the listed load when the gap is ¼” or less.



Christopher Banbury, PE


Ark Engineering, Incorporated

PO Box 10129, Brooksville, FL 34603-0129

22 North Broad ST, Brooksville, FL 34601

352.754.2424 (o)

352.754.2412 (f)


From: John Riley [mailto:jpriley485(--nospam--at)]
Sent: Monday, March 06, 2006 5:16 PM
To: seaint(--nospam--at)
Subject: Re: 1/2 inch gap under bottom chord


I don't know about the gap, but it's a common detail to not attach the wall to the truss.  It came about because super-insulating attics resulted in some trusses lifting.  I've seen interior non-bearing walls with a 1.5" gap below the base board, the walls were being lifted by the trusses.  I think its also common practice to leave the ceiling gypboard unattached within 16" or 18" of the wall.  I'll see if I can find a reference to the whole mess.  John Riley

"Chance, Acie" <AChance(--nospam--at)> wrote:


     A plan checker has requested a detail with a 1/2 inch gap between the wood stud interior nonbearing walls and the bottom chord of the wood trusses.  My first thought was to screw a 24 gage metal track to the bottom chords and set the top of the nonbearing wall in it but not attach the two together.  I could also use a couple of angles attached to the top plates but not attached to the bottom chord of the wood truss.  As this is the first time I have been required to do this and I am concerned about the drywall attachment, I was wondering if anyone had run across this and how you detail it. 

Acie P. Chance   S.E.


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