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RE: Wood: 'en' and Plywood question.

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> 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.