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adding a vent to shower

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Nov 16, 2013, 11:23 AM
adding a vent to shower
I am in the process of tiling a basement shower and have concerns with poor ventilation. I installed tile-backer and painted the backer-board with UGL paint as a temporary measure while in-laws visited last year. Since then I have noticed a slight mold problem along the floor where the BB and concrete floor meet.
There is a small exhaust fan outside the shower for a 10 x 12' room that seems to be working okay. As an option, can the the air return duct for the heating/AC system -- which runs up the wall separating the shower from the family room -- be used as a vent?

Thank you for any info and suggestions.

Nov 16, 2013, 12:09 PM
You can't do double duty with the air return.

Since it's a basement, good chance you need to install a dehumidifier that can run 24/7. While your shower will add moisture (especially if the vent fan is not used) overall most basements will stay a little damp. Even a medium sized dehumidifier with a humidstat will keep things under control - as long as you have it rigged up to drain continuously.

Nov 16, 2013, 01:08 PM
dehumidifier as suggested..
sounds like condensation from under your floor plastic over the dirt under the floor
as a vapor barrier

dehumidifier hooks up to the hot water...drains into a y-branch tail peice,,under a sink. Wink

This message has been edited. Last edited by: Frodo,