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RE: Plywood roof to steel angle connection

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List members:

I am working on a residential remodel consisting of steel angle truss at eigth feet on centers.  The architect does not want any nailers on the trusses.  2x4 roof joist span parallel to the trusses and supported by 6x3 1/2 x 5/16 double angles spanning between the trusses.  The thickness of the angle is 1/2".  The plywood sheathing is 1/2".  What kind of self drilling screws are usually specd out.  Self drilling metal screws to connect plywood to metal usually are for metal thickness upto 20 gage.  Is it possilbe to spec out pre-drilling the angle and then inserting a 8# self drilling grabber metal screws. 


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