Vapor barriers

Question from Mark: 

I'm in the process of remodeling a mud room and want to know if I should vapor barrier the ceiling after put insulation up. We plan to have the room heated during the winter months. 

Jake's answer: 

Mark, Vapor barriers go towards the warm side of the insulation, so you would want to install the vapor barrier first. If you are using kraft faced batts, the kraft paper will act as your vapor barrier. Otherwise, you should install a plastic vapor barrier.