Does Hardie Backerboard 500 need a vapor barrier?


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Old 08-24-22, 09:58 AM
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Does Hardie Backerboard 500 need a vapor barrier?

I'm putting up Hardie Backerboard 500 on my corner shower wall which will be tiled afterwards. Hardie claims this backerboard is fully waterproof but I do have to use thin set mortar to seal all my seams and leave the board a 1/8" above my shower base lip. I have R-19 faced insulation in my walls, 1 wall is warm and the other one is on my inside garage wall. Will my faced insulation act as a vapor barrier or do I also have to put a plastic vapor barrier on my studs over the insulation...
 
 

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