Reply to "O S B instead of plywood"

It is my impression that the bonding agent for the wood chips can cause an allergic reaction for some people as there are fumes given off.  But perhaps others have had first hand experience with that aspect of this product and can comment specifically.  I use plywood, but had considered OSB for its weight and lack of warping.  To me, weight is mass which can reduce vibration to make a more quiet running layout.  Even plywood over drywall would provide greater mass--it's almost like running your train on a concrete floor.