Welcome back to the board Bob.

Your comment does make sense to me. I watched some guys decking a second story home down the street the other day. They would actually lay down a section of the OSB and nail the upper corner just to hold it in place. Then lay down another piece, nail it the same way and then go back to the prior piece while laying on it and nail the bottom edge. When I saw this I thought he's nailing it with his weight on it so he creating the deflection with the install. Make sense?

rick

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Rick Hurst_Home Works Inspection Co_Rockwall TX
In the words of Mike Tyson.... "Everyone has a plan until they get hit inda mouf"