I have had a house framed with a truss roof and am now building the interior walls. The joist chords on the trusses are bowed up as much as 3/8″ near the center of the truss.
How do I attach the walls to the joists?
If I attach the ceiling to the joists using furring, will that pitch be noticeable? Should I shim between the furring and the joists to level the ceiling?
Thanks
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Replies
Hale,
Simpson makes a little bracket to attach the walls to the trusses. Lets the truss uplift and not take the wall with it.
Put deadwood on top of the wall and strap to this. Screw the rock there and 16" back on the next run of strapping which is attached to truss.
When the truss uplifts the rock flexes.
KK
It's possible that your truss system has a camber built into it and it will settle with the weight of the roof and drywall.
Possible, but not probable.
Don't shim. Learn a little about truss uplift. You will learn that there will be movement and your desire to fix the partitions should allow some form of vertical lift capability for your trusses. You could use the simpson clips or use other creative methods. I'd use creative methods because I hate simpson and use them only as a last resort.
Bob's next test date: 12/10/07
Out here in SoCal, non-load-bearing interior walls may not be solidly connected to truss cords (except a drag truss to a shear wall). Interior walls must be framed with a 2x4 top plate and 1x4 cap plate to allow room for trusses to sag a little without touching when the roof is loaded.
If the wall requires lateral bracing, Simpson STC truss-to-wall slotted clips fasten firmly to the cap plate but loosely to the truss cord with a nail in the slot to allow vertical truss movement.
http://www.strongtie.com/FTP/bulletins/WC-PTBI06.pdf