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bathroom walls and ceiling moisture

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Posted 2013-08-22T16:40:15+0000  by gscheff7 gscheff7

Hi gscheff7,


What kind of moisture problem are you having? Is this a new problem or ongoing?

Please give us more detail.





Posted 2013-08-22T17:17:20+0000  by Mike_HD_OC

Hello gscheff7!


In the atmosphere, moisture builds up until the "Dew Point" is reached and then moisture condenses (collects) into droplets we call rain.


In your bathroom, a very similar thing happens.


Your hot shower creates moisture in a small, relatively closed area.


As the moisture content builds up, the cooler surfaces of the walls and ceiling reach the "Dew Point" and droplets form.


Walls in the lower levels of your home are naturally cooler and will tend to form condensation more quickly than the warmer walls on the upper levels.


There is a broad myth that some paint sheens cause more condensation than others, however this is just a myth.


Exactly like rain, droplets form when the increasing moisture content in the room comes in contact with the cooler walls.


This atmospheric phenomenon has nothing to do with paint sheen.


So, the easiest way to prevent moisture on walls and ceiling is to install an exhaust fan to remove the moisture; keeping the moisture content lower and helping prevent condensation from forming on the walls and ceiling.



It is true that Flat paint tends to show the resulting watermarks more because Flat paints provides very little protective coating on the wall.


As droplets form, they run down the Flat wall and the droplet tracks show as watermarks.


Sheens like Eggshell and Satin provide much greater protection.


So, while droplets still form, they don't tend to leave watermarks like they do on Flat paint.



Any time water has left a mark on your sheetrock, you can try cleaning the walls.


However, you will most likely need to use an oil-based primer to seal the watermarks before repainting.


Almost all oil-based primer can be tinted, which provides the first coat of color while priming.


After your primer has dried about two hours, you can apply new paint.

Posted 2013-08-22T17:57:40+0000  by Pat_HD_ATL
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