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RE: Drag forces perpendicular to roof trusses and or joists

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>Most times interior shear walls tend to run parallel with trusses so it is easy to use roof trusses as drag struts
>or to transmit drag forces from one wall to the other.  It is also pretty straight forward to design the connection
>of the drag strut to the shear wall (tension or compression). 
 
Are there not limits on the aloowable nailing to truss chords somewhere out there? I had encountered this problem long ago and remember the parrallel transfers to be a difficulty as well.
 
Michel Blangy, P.E.