I noticed Tom Silva using a lot of OSB on the Newton project, both on the exterior walls and on the floor in the new master bath. In years past, he preferred plywood to OSB. What has changed? Has the quality of the OSB improved? Is the 'green factor' of OSB changed his mind? Or could it be since he using the Icynene spray-in insulation, he thinks that 'adheres' everything all together?!? ...kind of like a SIP??!?