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Re: Nails to Metal Truss

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Thanks for the input. 

The problem is that there is a metal roof installed over the plywood.  In order to add screws, the metal roof has to be removed! 

I did not do the engineering on the existing roof.  In fact, I do not think there was an engineer involved.  That is why I want to be sure that before I bring this to the attention to the owner, there is no data supporting the use of these nails.  I did a bit of searching, and have not seen any ICC reports or other manufacturer data. 


On Fri, Jul 31, 2009 at 12:53 PM, David Topete <d.topete73(--nospam--at)> wrote:
Like Drew mentioned, screws are the ideal fastener.  If you have a 6" fastening pattern, add screws and neglect any contribution from a spiral nail that may or may not have some withdrawal resistance.

On Fri, Jul 31, 2009 at 9:37 AM, Drew Morris <dmorris(--nospam--at)> wrote:
See if there is some sort of ICC report on these nails and whether they have any published withdrawal values.  Screws would have been better.

Andy Richardson wrote:
Has anyone heard of a valid use of 8d spiral nails for attaching 5/8" OSB to metal trusses.  I am working on a porch addition to a 3-year old school where this was done on the roof.  I am concerned that the nails will not be adequate for uplift.  This project is in a 130 mph, exp b location.  The uplift forces at the corner can be ~75 lbs per nail based on a 6" pattern.

Andy Richardson
Beaufort, SC

David Topete, SE