August 1, 2019
We have a wood framed apartment complex with interior shear walls with 5/8” gyp board sheathing. We specify 6d cooler nails at either the 4/4 or 7/7 spacing to match the shear load tables in the 2012 IBC and 2008 AWC SDPWS. The contractor is pushing to use screws instead of nails, stating that nails are “never used for interior gyp board walls that require a finish”.
The 2006 and 2009 IBC Table 2306.7 footnote “c” allowed the 6d cooler nails to be substituted with #6 x 1 ¼” type S or W screws, but in the 2012 IBC this table was simplified further to only show shear values for staples, and in the SDPWS (which basically shows Table 2306.7 of the 2006 or 2009 IBC), there is no longer a mention of this substitution.
If we want to maintain the shear resistance that 6d cooler nails provide in 5/8” gypsum board at a 4/4 spacing, can the #6 x 1 ¼” screws be substituted? Some engineers believe that this substitution ended up being omitted by mistake, while others argue that this substitution was omitted for a reason, perhaps because the assembly with screws wasn’t tested.
Anyone have any further insight on this?
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