For Stuart A. Can't help but wonder. Yest I have seen what I call B.S. Boards in USA . We have regular ones as well. Did you friend get them at a regular building supply place as construction lumber or from one of the MA Suppliers? Typicaly the ones from the MA suppliers are the BS ones. For others I would submit that Americans / westerners question everything as a rule. In the east it was common to respect directions without question. "We do it this way because: A. The Instructor says so; or B. That's the way it's always been done (So it must be good.)" Westerners ask "Why do we do it this way? " and want more explanations. Notice I use the term "Westerners" not wanting to give Americans sole credit.