Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

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

[Subject Prev][Subject Next][Thread Prev][Thread Next]

One qualifier on the use of NDS(r) 11.5 - it only applies for D>=1/4"
fasteners. For nails and wood screws, see the NDS Commentary. Table
C11.1.5.6 for recommended nail spacing. There's a similar table for wood
screws as well in C11.1.4.

If you don't have a NDS Commentary, you can download one here:



John "Buddy" Showalter, P.E. 
Director, Technical Media 
AF&PA/American Wood Council 
1111 19th Street, NW, Suite 800 
Washington, DC 20036 
P: 202-463-2769 
F: 202-463-2791 

The American Wood Council (AWC) is the wood products division of the
American Forest & Paper Association (AF&PA). AWC develops
internationally recognized standards for wood design and construction.
Its efforts with building codes and standards, engineering and research,
and technology transfer ensure proper application for engineered and
traditional wood products.

The guidance provided herein is not a formal interpretation of any AF&PA
standard.  Interpretations of AF&PA standards are only available through
a formal process outlined in AF&PA's standards development procedures.


From: "Scott Maxwell" <smaxwell(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: RE: Minimum edge distance OR back to the treated lumber

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 <=3D 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. =20 Regards, =20 Scott Adrian, MI

-----Original Message-----
From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)]=20
Sent: Thursday, February 07, 2008 8:29 PM
To: seaint(--nospam--at)
Subject: Re: Minimum edge distance OR back to the treated lumber

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

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 =BD" of the plywood over
= the 3x plate and boundary nail without splitting the sill plate or the
end of = the plywood panel (assume =BC-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.



******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********