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RE: 2x T&G decking

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2000 IBC section 2306.3.4 has some info for single and double diagonally sheathed diaphragms.  Basically, 1x at 45 degrees nailed with 8d nails, S. Pine or D-F-L allowable is 300 plf.  2x and 16d nails has the same capacity if the nominal framing thickness supporting the diaphragm is 3”.  Table 2306.3.3 shows how to nail it.


The “Western Woods Use Book” from The Western Wood Products Association has a lot of info.  Table 10.1 gives an allowable of 75 plf for 6” nominal width boards laid transversely across joists at 16” o.c.  But they recommend not using transverse boards if the shearwalls are concrete or masonry.  They also recommend 8d nails, so I assume they are discussing 1x nominal boards.  Anyway, lots of good reading in chapter 10.





-----Original Message-----
From: Eli Grassley [mailto:elig(--nospam--at)]
Sent: Wednesday, October 05, 2005 4:20 PM
To: seaint(--nospam--at)
Subject: 2x T&G decking


I have a small residential job where the owner wants to use 2x6 T&G floor decking – for looks basically – instead of normal plywood.  I know that the diaphragm shear values for this type of construction is very low, but it can’t be zero.  Does anyone have any references or published values that I could shake a pencil at?  Does the IBC or NDS forbid this kind of a diaphragm in any of their language?

Using plywood at all would basically kill the concept due to costs, so any shear values at all would be helpful.


Thanks for any help



Eli S. Grassley, PE