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RE: NDS- Nails

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The Wood Engineering and Construction Handbook by Keith Faherty and Thomas 
Williamson has a list of recommendations from four different sources which 
I have summarized and edited to be as follows:
	End distance = nail length
	Edge distance = 1/2 nail length
	Spacing in row = nail length

Roger C. Davis
SDS Architects, Inc.

-----Original Message-----
From:	Andrew D. Kester [SMTP:andrew(--nospam--at)]
Sent:	Monday, December 30, 2002 4:47 PM
To:	seaint(--nospam--at)
Subject:	NDS- Nails

According to the 97 NDS, Section 12.4.1, Placement of Nails and Spikes 
-Edge Distance, End Distance, and Spacing- "..for nails and spikes shall be 
sufficient to prevent splitting of the wood."
Well, that seems logical and easy enough for when I am building shelves for 
my garage or adding on a deck to my house, but putting that on a detail 
makes me a little uneasy. Also, I have a decent sized load on a connection 
I am designing. What I need is a numerical rule of thumb. What I have 
decided to do, besides basing this on my own experience in carpentry, is to 
use the min. values based on the diameter that are given for bolts and lag 
screws.  This gives some pretty small but rather logical numerical values. 
The only reason I could think that these would not directly apply is that 
bolts and lag screws usually use pre-drilled holes, while nails almost 
never do. So for splitting purposes, this would not necessarily apply. But 
if the wood does not split, then the spacings and edge/end distances 
derived from the bolt/screw guidelines should logically apply to another 
circular, steel connector, a nail,  if I use the same diameters.
I am particularly concerned with this connection as it involves a parallel 
to grain tension member connected at the end. I am planning on using 6+ 
 16d nails for this connection. It is a 2x8 and a 2x6, with the 2x8 
vertical, and the 2x6 at a diagonal connected at the center of the 2x8 (the 
2x6 is a diagonal brace for the 2x8 which is a gable end stud).
Does this make any sense? Any recommendations or suggestions? When you guys 
get back from your New Year's parties I will look for an answer, but take 
it with a grain of salt due to the "Champagne Factor" :)
Thanks in advance,

Andrew Kester, EI
Longwood, FL

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