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# RE: Wood: 'en' and Plywood question.

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: Wood: 'en' and Plywood question.
• From: Al Grathwol <AGrathwol(--nospam--at)BoyleEngineering.com>
• Date: Thu, 15 Jul 1999 16:02:15 -0400

```Sorry - I didn't catch his reference to deflection only.
Al

> -----Original Message-----
> From: Seaintonln(--nospam--at)aol.com [mailto:Seaintonln(--nospam--at)aol.com]
> Sent: Thursday, July 15, 1999 12:54 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Wood: 'en' and Plywood question.
>
>
> Al, you misunderstood the question. This has nothing to do
> with the capacity
> of the nail. It is related to the calculation for deflection
> which assumes
> that the actual shear in the panel is distributed uniformly
> to each nail at
> the edge of the panel. Therefore if you had 240 pounds of
> shear per foot and
> the panel was nailed one one side at 6" o.c. you would have
> two nails per
> foot and each would take 120 pounds of the shear. My
> questions was then if
> you sheathed both sides of the wall, you would end up with 4
> nails per foot
> (two per each side). I asked if it was appropriate in the
> deflection formula
> to then consider the load to each nail as 60 pounds per nail.
>
> I think that this is the correct interpretation of the problems.
>
> Dennis Wish PE
>
>
> In a message dated 7/15/99 8:35:19 AM Pacific Daylight Time,
> AGrathwol(--nospam--at)BoyleEngineering.com writes:
>
> <<
>  > 1) I know this is an elementary, but I want to make sure I
>  > have it right. If
>  > you sheath both sides of the wall using the same nail pattern
>  > (who wouldn't?)
>  > do you reduce the nail capacity in half?
>
>  I don't know why you would do that.
>
>  > For example if you have 8d at 6" on the edge on one side, the
>  > capacity per
>  > nail is v*(6/12) per nail. However, if both sides are
>  > sheathed with 8d at 6"
>  > o.c. is the capacity per nail v*(6/24) ?
>
>  I see no reason to reduce the strength.  The nails on one
> side of the wall
>  don't know that there are nails on the other side!
>
>  >
>  > 2) What thicknesses of plywood and OSB are commonly used for
>  > shearwalls. I
>  > always specify 15/32" 5-ply (struct I) panels but understand
>  > that some use
>  > 3/8 or 1/2". With all of the choices for plywood's to
> determine wall
>  > deflections, which panels should I be considering for common
>  > use in all of
>  > the area's of the US (since the program calculates wind loads
>  > as well).
>
>  The UBC tables specify an allowable shear for various
> plywood thicknesses.
>   >>
>
>

```