lumber decking connection to steel joists
lumber decking connection to steel joists
(OP)
I'm using a diaphragm of 3" lumber decking oriented at 45 degrees and bearing directly on steel roof joists. Has anyone done this before and how did you connect the decking to the joists? I was thinking I could bold a nailer down to the top chords and nail the deck to this.
Thanks
Thanks






RE: lumber decking connection to steel joists
RE: lumber decking connection to steel joists
The joist manufacturers attach a 2x wood nailer to the top chord of the joists themselves. The attachment uses tek screws spaced evenly on each side of the chord.
Depending on where you are located, it might be worth giving a joist manufacturer a call and find out what their capabilities are.
RE: lumber decking connection to steel joists
Mike McCann
MMC Engineering
RE: lumber decking connection to steel joists
RE: lumber decking connection to steel joists
The 2009 IBC, Section 2306.2.2 points one to the AF&PA Special Design Provisions for Wind & Seismic for design values. I think that it is Table 4.2C. The allowable shear for diagonal lumber sheathing (1 or 2x sheathing) is 300 plf for seismic & 420 plf for wind loads.
RE: lumber decking connection to steel joists
SteelPE - the link below is an old posting in this forum. Taro (about half way down) references the ANSI/AF&PA SDPWS-2005 for values. Horizontal orientation gets you 50 lb/ft seismic, 70 lb/ft wind. Diagonal orientation gets you 300 lb/ft seismic, 420 lb/ft wind.
file:///S:/2011/2011-100%20Woodstock%20Park%20Expansion%20&%20Amphitheatre/Research/Structural%20engineering%20other%20technical%20topics%20-%20T&G%20Decking%20as%20diaphragm.htm
RE: lumber decking connection to steel joists
I don't think you link works but thanks for the effort.
Thanks for the information. This is something I have never come across but if I do in the future now I know.
RE: lumber decking connection to steel joists
RE: lumber decking connection to steel joists
I can't see a big joist manuf. like Vulcraft or Canam installing wood in the factory, but you can always ask. I can hear the response if I asked our contacts at those two. You want us to do what? Followed by, sorry, we are not in the wood business.
I have looked at a number of these from the 70's, and I sure do not like the connections they used, but those seemed to be largely the architects doing since they did not seem to think they needed any assistance other than what they could find in 2nd year engineering texts.
Brad
RE: lumber decking connection to steel joists
I do not know of any manufacturer's that install the nailers east of the Rockies. Location and shipping costs will determine availibility.
As far as the warrenty issue goes, I cannot see how they can make the justification that nails or screws will void it. Metal decks are fastened to joists with pins all of the time (the deck catalog produced by Nucor show this as an acceptable installation).
RE: lumber decking connection to steel joists