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RE: screws to WF

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Note, the screws have 24 threads per inch,

From: Harold Sprague [mailto:spraguehope(--nospam--at)]
Sent: Monday, November 23, 2009 1:23 PM
To: seaint(--nospam--at)
Subject: RE: screws to WF

Check out the data sheets.
Of particular interest is the data sheets at the end for combined shear and uplift.  Numbers 46 thru 49.

Regards, Harold Sprague

> Date: Mon, 23 Nov 2009 21:00:38 +0000
> From: akester(--nospam--at)
> To: seaint(--nospam--at)
> Subject: re: screws to WF
> If attaching to WF beams, most erectors I have come across prefer puddle welds. I have been told anything over maybe 3/16" or 1/4" (the max thickness of most joist top chords I think) just becomes a big pain, screws break and it is difficult. I have had RFIs to switch and gladly went along with that. After a couple such requests we put puddle welds as an option right on the drawings.
> LGSEA has several screw tables with shear, tension, pullout and pullover values, but likely if you use screws to attach to a WF beam it will be governed in uplift by pullover of the deck, not a failure of the screw. I would anticipate 18ga should give you some pretty good pullover values and may push the limit of the screw itself.
> Not sure about ICC approvals...
> Andrew Kester, PE
> Florida
> -------------------------
> I don't know about ICC approval but United Steel Deck catalog discusses
> screws along with welds. I would think screws would be acceptable if PAF's
> are. The screws have a large head than many of PAF's. The PAF's sometimes
> bounce rather than penetrate according to one craftsman (operator issue.)
> Hilti and the Steel Stud Manufacturers have values for screws and welds for
> light gage metal thicknesses to "heavy gage" steel.
> Glenn C. Otto, P.E.
> A Structural Engineer, P.C.
> Virginia Beach, VA 23454
> -----Original Message-----
> From: Drew Morris [dmorris(--nospam--at)]
> Sent: Friday, November 20, 2009 6:09 PM
> Subject: Steel roof deck attached using screws
> Does anyone know of a steel roof deck manufacturer (1 1/2" 18 ga) that
> has ICC approval for steel deck fastened to W beams using screws? I can
> find reports of decks attached with spot welds and powder actuated
> fasteners.
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