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#123736 - 05/02/06 10:49 AM Truss Construction  
Admin  Offline

Joined: Oct 2000
Posts: 3,458
Was drilling through a cap plate for a drop to a switch box, and I happened to notice that the truss I was working next to didn't actually contact the loadbearing wall... in addition, all of the trusses were just toenailed to the wall along the run. Gotta love "spec" construction!

- DougW
[Linked Image]

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#123737 - 05/02/06 11:27 AM Re: Truss Construction  
caselec  Offline
Joined: Apr 2002
Posts: 558
San Jose, CA
Most trusses are not supposed to be supported mid span, they are only supported on each end. The bottom cord of the truss is under tension and has virtually no downward force. The connection to interior wall is to keep the trusses in line and hold the wall plumb. This is often done with L-clips or toe nailing.


Curt Swartz

#123738 - 05/02/06 04:49 PM Re: Truss Construction  
Alan Belson  Offline
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
They are also not supposed to be damaged by a cretin firing willy nilly with a framing nailer. Look- 6 nails visible, all of them absolutely bloody useless. Highly stressed Chord with a big chunk missing, nails through and down the plate side, nails too close to arris, the 'nail from nowhere', nails under driven.
Never any excuse for this sort of butchery, - and this truss is scrap IMO.


Wood work but can't!

#123739 - 05/03/06 05:37 AM Re: Truss Construction  
Trumpy  Offline

Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Interesting pic Doug,
I couldn't agree more Alan, IMO the worse thing they ever did was give carpenters nail-guns.
I've injured myself I don't know how many times up in roof voids, on nails protruding from places they should never have been in.
I've also noticed that them nails used in nail-guns are twice as sharp at the point as standard (manually-fitted [Linked Image]) nails.
Good for tearing into your hand in a dimly-lit roof.
One thing I have learned, is never sit down on any trusses or wall plates in a roof in New Zealand.
Unbelievable. [Linked Image]

#123740 - 05/03/06 10:26 PM Re: Truss Construction  
DougW  Offline
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
Curt - This was at the end of the truss... it spans across the cathedral ceiling living room. That upraised piece in the foreground was the end of it.

One of the things that also surprised me is the lack of reinforcement at the midpoint - just a "spike plate" butt-joining the two 2 bys' that make up the bottom chord. And no, the "angles" of the truss didn't meet there either.

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