Do you have to vapor barrier and insulate a shower?

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Redoing a bath. Getting ready to cement board the shower. There is no insulation in the walls when the fiberglass unit was removed. Opposite side of the walls are closet and another bathroom. No external walls. Would insulating it do anything? Also, do I have to add plastic before putting the cement board up? I will redguard after the cement board seams are done.https://ibb.co/KjrFPkv via /r/DIY https://ift.tt/3ccs4wW

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