Since the moisture can't readily escape the bathroom, it will become an even better breeding ground for microbes. Odors will stick around and the room will be more likely to grow mold and mildew. The high humidity might even affect the room structurally. Critters that prefer humidity will likely show up - like silverfish, centipedes, sow bugs. Hopefully, no one takes hot steaming showers or baths in that one.
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We used an exterior paint on our (interior) drywall bathroom walls when we remodeled a couple years ago because we took out the window and only have the exhaust fan for ventilation. It worked well and we don't find the moisture hanging onto the wall surfaces. So far we are very happy with the results.
Normally the second switch in a bathroom is the control for the bathroom's exhaust fan. The exhaust fan removes bad odors and humidity from the bathroom, and is on the ceiling of the bathroom.
In pre-PCV (Positive Crankcase Ventilation) vehicles, that was a term for the crankcase ventilation pipe.
Hi, The first step I would recommend would be to get a quote. Have a look at http://www.elyfe.com/remodeling.html where you can get some free quotes from contractors in your area.
A lever in a bathroom can flush your toilet or open a faucet.