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Re: Plywood roof to steel angle connection

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Gautam,

I am assuming that your 2x4 roof joists are spaced at 2'- 0" and also 2'- 0" from the steel angle trusses. This would give you three joists per bay and a need to connect the roof plywood directly to the steel roof trusses.

You might consider using four joists per bay, still spaced at 2'- 0" but 1'- 0" on each side of the steel angle trusses. This way there would be no need at all to connect the plywood directly to the steel trusses. You would, of course, still have to connect all of the roof joists to the truss system to resist uplift due to wind loading.

       Just a thought.

Regards,

H. Daryl Richardson

----- Original Message ----- From: "Gautam Manandhar" <Gautam_Manandhar(--nospam--at)ci.richmond.ca.us>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, August 17, 2005 10:37 AM
Subject: RE: Plywood roof to steel angle connection


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.


Gautam


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