Do I need a vapor barrier?

I have a 1918 bungalow and am doing a full remodel of the finished attic including the addition of a shower.  I have not changed the roof venting but doubled… I have a 1918 bungalow and am doing a full remodel of the finished attic including the addition of a shower.  I have not changed the roof venting but doubled…Read MoreGreenBuildingAdvisor