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RE: Minimum edge distance OR back to the treated lumber question.....

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Take a look at section 11.5 of the 2005 NDS, since you now fall under the 2006 IBC which references the 2005 NDS.  It has adjustment factors for Edge and End distance.  In particular, Table 11.5.1A is for Edge Distance.  For if the loading is parallel to grain, then if l/D <= 6 (where l is the lesser of the length of the fastner in the main wood member or the length of the fastner in the secondary wood member(s) and D is the diameter of the fastner) then minimum edge distance is 1.5D.  If l/D > 6, then it is 1.5D or 1/2 the spacing between rows, whichever is greater.  If the loading is perpendicular to grain, then for a loaded edge it is 4D and for an unloaded edge it is 1.5D.
Adrian, MI
-----Original Message-----
From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)]
Sent: Thursday, February 07, 2008 8:29 PM
To: seaint(--nospam--at)
Subject: Re: Minimum edge distance OR back to the treated lumber question.....

Use PT Sheathing and go down to 6" (DSA used to allow this when they had a 12" clearance requirement (Using PT Sheathing, you could go to 6") or use a small strip of sidewalk against it and use Sheet metal flashing instead of soil. DSA now has the same 8" clearance as the normal building code.

Edge distances for nailing is not something that is quantified that I know, but I like to have 3/8" min from edge of stud to C.L. of nail for 8d's


On Feb 7, 2008 4:31 PM, Dennis Wish <dennis.wish(--nospam--at)> wrote:

What is the allowable edge distance for a 10d or 8d Common nail in D.F. lumber parallel to grain? Also, what is the minimum distance from the nail to the end or edge of a plywood panel to prevent splitting. If I started with two panels joined on a horizontal diaphragm over a 2x joist with 1/8" gap per APA requirement for panel expansion, the remaining lap is 11/16-inch. How much of this is actually needed.


Of course my question goes back to using a 3x6 Pressure Treated Mud-sill against a foundation or slab on grade which is only 6-inches clear from finished soil. Is there sufficient room to lap ½" of the plywood over the 3x plate and boundary nail without splitting the sill plate or the end of the plywood panel (assume ¼-inch clearance to centerline of nail). I am only assuming a boundary nailing of 6-inch on center and not closer at this point just to see if I can resolve this conflict.