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Re: Re: screws in wood diaphgragm

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There ought to be an ICC report that summarizes the useability of the screw in diaphragms. The screws are most likely not an off the shelf local hardware store product.  They are sold in large magazines for gun installation and are made specifically for that use. They should not any slower to install than nails.


From: Robert Kazanjy <rkazanjy(--nospam--at)>
Date: 2007/01/28 Sun PM 01:02:09 CST
To: seaint(--nospam--at)
Subject: Re: screws in wood diaphgragm

check with think they have some info on screws w/ plywood. 

I assume they're planning on using real screws not drywall screws?  

If the GC squawks maybe ring shanks w/ adhesive could be a compromise, screws are pretty slow

btw  Buddy is with AF&PA/American Wood Council  (at least last time I checked)


On 1/28/07, Andrew Kester, PE <akester(--nospam--at)> wrote:Joseph,I did not find anything in the 2005 NDS about screws in wood diaphragms but they do have values for gypsum attached with screws. I think it would be ok if the screw diameter, head, and strength could be matched up with a nail size in the diaphgram tables, you could use that value. The resulting diaphgram would likely be stiffer with less deflection because you don't have as much nail slip, and your uplift resistance would go up. I would think you will make a GC pretty upset though, that is a lot slower than a nail gun. Maybe Buddy at APA or their website would answer this more definitively.. Andrew Andrew Kester, PE
ADK Structural Engineering, PLLC
Lake Mary, FL 

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