I am insulating an attic knee wall that is against a bedroom finished (old fashioned plaster) wall. Standard info says put the vapor barrier toward the living space but at the store they said that since the wall is finished, that I can do it the easier way, putting the paper vapor barrier toward the attic (easier to staple the paper flanges). But I cannot confirm this in any of my reading. Can anyone confirm this for me? Consequences of doing it incorrectly? thanks so much.