How to Prevent Mold and Moisture with Shower Vapor Barrier

Vapor BarrierIn your shower, one of the most crucial things to protect yourself from is mold and moisture damage. The CertainTeed Vapor Barrier does just this by using an advanced technology of smart vapor retarder and air barrier film.


Isn't waterproofing shower walls enough?

Only waterproofing your shower walls does not stop water vapor from getting behind your backer board and into your wall cavity behind. When you are waterproofing a shower, it stops liquid water from penetrating walls, but not vapor (steam).

This bathroom vapor looks like fog, and it happens each time water is used in a shower. The fog travels all the way outside the actual shower to the rest of your bathroom, forming the evidence on your mirrors.

If enough of this vapor gets into the shower walls,  it gets trapped and mold finds a perfect home to grow. If enough vapor  builds up and the temperature changes, it can turn to liquid and run down the inside of your walls causing damage that you’re not even aware of – until you have a huge problem on your hands.


This is quite unfortunate when we see it happen to people that either weren’t informed, or didn’t take the necessary precautions to avoid this.

Problem Solved: Introducing CertainTeed Membrane

Dix Systems uses the CertainTeed membrane as the bathroom shower vapor barrier of choice.


This is an innovative vapor and air barrier film that is breathable and allows moisture to escape, keeping walls dry year round. Traditional six mill poly often used as a vapor barrier doesn’t actually breathe so moisture gets trapped inside wall cavities. The CertainTeed wall vapor barrier is installed to drape the inside shower liner so that if there is any moisture build up it will weep into the shower liner.

Here are some reasons why the CertainTeed Membrane outdoes any other commonly found vapor barrier sold in stores:

  • The membrane allows the vapor to dry out with changing temperatures.  This is one of the most important features because temperature change occurs very frequently in all regular showers and bathrooms!

  • The membrane allows these drips to evaporate while the room is going back to its regular temperature, once your shower is complete.

When you take a can of Coke out of the fridge on a hot summer day, within only a couple of seconds of the temperature change you can see beads of "sweat" running down the side of the can. The air in the room or outside will dry the can. Though your shower and bathroom may not have as extreme of a temperature difference as a can of pop out of the refrigerator on a day with temperatures of 82ºF/28ºC, in the end there is the same effect. The temperature from your shower stall to just behind your cement board can be enough of a temperature change for this "sweat" and CertainTeed vapor barrier creates the effect of open space to assist the water beads to evaporate rather than penetrate your wood framing.


For more information watch our Vapor Barrier installation video or call our friendly customer service team at 1-888-450-0112.


Dix shower vapor barrier comes in a variety of different sizes:  96 Sq/Ft , 144 Sq/Ft , and 800 Sq/Ft .


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