I am currently working on a bathroom that includes a steam shower. The shower will have a 6ml vapor barrier followed by durock cement board and then Hydro Ban. I wanted to put insulation around the shower to help keep the heat in. I also wanted to put insulation on the ceiling and walls of the rest of the bathroom in order to help with noise reduction. All the areas I want to insulate are interior walls.

My question is weither or not I need insulation with a vapor barrier on any of these areas.

Thanks for your help