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Re: 3Xs at Abutting Panel Edges

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I've accepted the APA tests also. My detail uses box 16d at the same spacing as the panel edges (including the stagger at less than 6" o.c.). I 've also made a detail showing how to stagger nails (& they still get it wrong half the time). Given the nailing problems, I spec 4x at all tiedowns & panel edges. The gang nailing gets used as a repair when they use a 2x instead (in which case it become three 2x nailed both ways at the panel edge.)

On a separate note. Has anyone made a detail of the APA narrow shearwall portal frame? APA's detail is hard to read & even a little weird (triple bottom plates, no outboard top straps to the header, a single anchor bolt as shown,...). Can Tom Skaggs gives us any insight on this thing. I did let someone use it once but concluded that it just a lot easier to spec Simpson or Hardy panels ( & probably no more $ for the builder who needs one or two).

Chuck Utzman, P.E.

Bill Allen, S.E. wrote:

I’m sure this topic has been discussed many times, but I would like to readdress it.

A client has asked me if he can use 2-2Xs instead of one 3X. He has provided me with APA Report T2003-22. I’ve created a detail and a link to that report at:

For those of you with a little time on your hands, I would appreciate it if you would review the detail and let me know if you think this detail is code compliant. Using a literal interpretation of the code, it’s pretty straightforward. It says a “single 3X” member at abutting panel edges. For the life of me, I can’t see why two 2Xs face nailed together wouldn’t be as good (I think better because of improved edge distance). Now, APA has a report that has tests which seem to confirm my belief.


T. William (Bill) Allen, S.E. (CA #2607)


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