[Strawbale] lumber grading (was: plwood vs. osb for arch gussets)

[Chris Green]

Derek Roff wrote:
> I've read, in Forest Products Laboratory publications, that fairly 
> accurate stress-grading of dimensional lumber is possible in the field, 
> by an owner-builder.  What's your opinion, Chris and RT?
>   
This is news to me, so I don't have an opinion one way or the other. 
Right now I can't even guess how one would do that without a lot of 
those gizmological wonders RT frequently mentions.

Cheers,

Chris Green.