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[SEAOC] Re: [SEAOC] Re: [SEAOC] Re: [SEAOC] plywood shear panel nailing

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In the 1995 SEAOC Proceedings, 64th Annual Convention there is a article
Laboratory Testing To Investigate Pneumatically Driven Box Nails..........
The box head nails actually tested better than commons for 3/8" plywood.
The head size has a significant effect on performance. I do not recall if
the nails were coated, but I don't think they were. Overdriven box head
nails performed better than commons as well.

Jeff Smith, S.E.

>RLFOLEY(--nospam--at) wrote:
>> The only diffference I am aware of is the issue of overdriven nails damaging
>> the outer ply when machine nailing.  APA  has a bulletin that covers
>> overdriven nails.
>> The subcontractor should use a nail gun with a governor on it to minimize
>> overdiving
>> RLFOLEY(--nospam--at)AOL.COM
>> Structural Engineer
>As far as I know, SEAOSC has done studies for the difference in shear 
>walls nailed with sinkers verses common nails. L.A. City has called for 
>a degradation of 15% off the rated shear where sinkers are used in lieu 
>of common nails.
>I know that there is still some controversy over this issue.
>I also agree with Ray that the major problem with power driven nails is 
>the damage to the ply layers. The advantages that I read about power 
>driven nails is the advantage of the hot glue that creates a better bond 
>with the wood for resistance to nail withdrawl.
>Dennis Wish PE

Jeff Smith. S.E.
phone: (415) 543-8651
fax: (415) 543-8679
email: smthengr(--nospam--at)

Smith Engineering
27 South Park
San Francisco, CA 94107