I just finished a 70 sqft bathroom remodel on a 100 yr old victorian in San Francisco. (11 ft celings) I tore everything down to the studs, insulated, added a 100 cfm fan and a window, and we’re getting condesation on the walls on every shower. I thought I did everything right. Any other suggestions on how to prevent the condensation other than taking cold showers?
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Another fan or a larger one I suppose.An HVAC supply house may be able to answer your question .
mike
100cfm fan should be enough the size bathroom you have. By any chance, could there be any blockages or kinks in the vent that is restricting air flow
Definitely test the fan, because it should be doing a fairly good job. Get up on a stepladder and light a stogie, and see if it draws the smoke nicely.
How much ductwork does it go thru to get outside? How many elbows? Soild ducting, aluminum flex, or the foil slinky junk?
How long and how hot are the showers? 770 CF is not a large volume, and can easily be converted into a sauna if the water is hot enough and runs long enough. You don't mention, but if you installed the wall insulation correctly, with no gaps around the perimeter of the stud-bay, with a vapor barrier, you just significantly reduced the air-flow through the room.
Do you have a window that you can open?
BruceM
We're actually taking short showers because our hot water heater is too small, so it runs out on us. Another bit of information is that we don't have a door in yet. Would this make things better, or worse?
Getting your door on there will make a lot of difference on how that fan works. Right now there is so much air that the fan is ineffective.
When you get the door in place make sure that you have a gap at the bottom that is more so then normal for an interior door. Make it somewhere around 1''. When the door is closed and the fan is turned on air will come threw the bottom and up draft threw the fan, taking with it the moisture and/or odors.
Once you have the door in place and you are still having problems then follow the advice of the other posters.
HVAC systems need some space at the bottom of the doors in order to work properly. Not as much as the bathroom. To many times carpet is laid down on a wood floor going threw the doorway from the bedroom into the hallway, essentially blocking the flow of air. The HVAC has to work harder and longer to circulate the air threw out the house then. This means paying more money to achieve the comfort level that you want.
DaneI will always be a beginner as I am always learning.
I would test the fan and;
get yourself a timer switch for the fan so it stays on for half an hour ( or whatever time necessary) to clear the humid air from the bathroom.
Have a good day
Cliffy
Are these tile showers? How long does the condensation last? I'm not sure that you can prevent all condensation when a cold surface is exposed to steam.