Hi All, I am building a new home in Sanantonio. The builder is using T ply Green for the exterior sheathing - when I asked him why green T ply and not REd T ply - he says It is for vapor barrier like tyvec and studs are placed with 16" space and are diagnolly attached with studs - so they hold weight of the house. If green T ply OK without wrap sheet and are the studs like that bear house weight ??? Thanks a lot for comments