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Joe (Joe)
Senior Member
Username: Joe

Post Number: 435
Registered: 07-2006
Posted on Wednesday, September 02, 2009 - 06:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Marc - sounds like 1.5" would be the right length.
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Marc (Marc)
Junior Member
Username: Marc

Post Number: 18
Registered: 10-2008
Posted on Tuesday, September 01, 2009 - 08:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Just a quick justification of nail length would be helpful to me. I plan a 1/4"--3/8" slate thickness. Then the formula states twice the slate thickness plus 1" equals proper nail length for a 1 inch wood roof deck. I have a 3/4 inch thick shiplap deck. Would I use a nail less than 1.5 inches long then???? Just want to get it right. Thanks
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Joe (Joe)
Senior Member
Username: Joe

Post Number: 431
Registered: 07-2006
Posted on Tuesday, August 25, 2009 - 08:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

That issue (nail length) is addressed in this article (scroll down): http://www.traditionalroofing.com/TR5_readers_write.html
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Tim_dittmar (Tim_dittmar)
Senior Member
Username: Tim_dittmar

Post Number: 53
Registered: 05-2008
Posted on Monday, August 24, 2009 - 02:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I think "overdriving" nails is an issue here- once the nail bursts through, resistance probably changes and one can then hit it too hard for the changed circumstance/s... Also, a long nail that does not cut when "rippered" out of the roof can cause unfortunate side-effects for repair- a good rule is "no unnecessary length.
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Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 215
Registered: 01-2009
Posted on Wednesday, August 19, 2009 - 07:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

The points of the nails should just begin to break the surface of the wood. That is where they have the most holding power, To drive them further will eventually weaken the wood too.
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Acg (Acg)
New member
Username: Acg

Post Number: 1
Registered: 08-2009
Posted on Wednesday, August 19, 2009 - 03:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I heard two different stories, that the nail should and should not penetrate the back side of the solid wood 3/4" thick tounge and groved sheathing planking. The existing installation does not. NRA says it should/must. Jenkins, I believe, says it should not. Yes or no and why? Thanks for the help.

(Message edited by Acg on August 19, 2009)

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