Bathroom Walls Sweating

what can I do so my hardibacker walls in my bathroom wont sweat?
I insulated all the walls and bought the most ppowerful exhust fan. but the walls sweat badly when ever you take a shower or bath.
It sounds as if the fan is not getting enough airflow. If the walls are insulated and the fan is powerful enough and is exhausting out of the room to the exterior, the problem may be that it is not getting enough “make up” air. Here’s an experiment. Leave the bathroom door slightly ajar the next hot shower, and see if it alleviates the moisture build-up. If so, continue leaving the door cracked when showering or trim the bottom off about 1/2″ or so. This will allow the air from outside the bath to be the “make up” air and then feed the flow to the exterior.
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