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[SEAOC] RE: [SEAOC] Re: [SEAOC] ] Plywood: sinkers beat common nails?

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      I have a wood/staple question that I haven't found a definitive answer to in
the UBC code:

I have a plywood shearwall that requires 10d nails at 3" o/c at the panel
joints to achieve the desired capacity.  Would using 14 ga. staples at
closer spacing not require the use of 3" or wider framing members?  Isn't
the 3" or wider requirement based on splintering of the framing and/or
plywood and if so, does the smaller diameter staples (or 8d nails?) cause
the same concerns as 10d nails?  At what spacing would they also be of
concern?    Anybody know of any testing or code provisions or have some
information on this subject?  Does NER-272 contain this information?  

The shearwall values listed in the UBC are based on tested panels, not calculated values. You would have to find a report, with ICBO approval, that lists the values you're looking for using staples. You can't just compare the capacity of a nail versus a staple and interpolate shearwall values. The 2x versus 3x issue would be in the report.

Also, there are pneumatic guns that shoot nails called "8d" and "10d" which do not match the diameter or length of common nails. You cannot use them and the UBC values. There is an ICBO approved report that was sponsored by 5 or 6 P-nail manufacturers that has tables similar to the UBC with nearly identical values. Although some of these nails do match the lengths of their common counterparts, they are backed by the report and can be used.

Adam Koczarski P.E., S.E.

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