I have a steel building, spray foam insulation of about 1", R20 rolled fibreglass insulation with a white kraft paper attached. I am wanting to frame another 2x6 wall along with R20 batts insulation. My question is do I add a vapour barrier to the inside surface of the new 2x6 wall. Or asked a different way, does the rolled R20 insulation that can with the steel building already take care off the vapour barrier. By adding another VB
(if that is what is on the rolled insulation???) will I create some sort of vapour lock?