Mildewy ceiling in bathroom

Any such would be a bandaid. You need ventilation to get rid of the moisture or you're asking for a persistent mold problem that will make it very difficult to sell your home, and that can become potentially toxic to you and your family.

Get an exhaust fan installed that vents to the outdoors.

Best Regards,

-- Todd H.

The only real solution is to reduce the moisture.

However that said, I wonder if the mold was interior to the drywall and maybe you should consider replacing the ceiling? You also may want to assure that the area above the ceiling is also dry and ventilated.

We do have a combination light/exhaust fan in the ceiling that vents from the roof. The fan did reduce the mildew problem but did not eliminate it. The shower stall is in this bathroom. A family of five (with two sons who are jocks) keeps the room pretty damp. Also, we're in a humid climate zone. These factors together with the poor ventilation create a problem that has to be solved on several fronts at once. My hope was that a UV light left on all night might contribute something to a solution. Timo

ventilation.

What did you use? I had that problem and painted the ceilings of two interior, windowless bathrooms with Zinsser (spelling?) perma-white, mildew proof ceiling paint four years ago and haven't had a spot. and I live in Mississippi, the mildew capital of the world.

Frank

We had a similar problem and we too live with high humidity as we are next to the rainforest. The first thing we did was to enlarge the one window opening. We now just have screen about 3 X 2 feet, over the shower, and that helps the ventilation. Then in the vanity which was so moldy (!), we put in a little heater bar- one designed to reduce humidity in closets? The combination seems to be working. We do not have kids taking long showers though. Good luck. That mold looked terrible. aloha, Thunder smithfarms.com Farmers of 100% Kona Coffee & other Great Stuff

Any UV light that is strong enough to fight mold is going to be strong enough to harm people. They can be used in air ducts and water pipes, but not where people are around.

I have seen mold on ceilings in bathrooms with exhaust fans.

2) Make sure the exhaust fan has a tightly closing damper, or humid outside air can leak back in when the fan is off.

Just some thoughts, because I have seen those problems before.

Stretch

I was thinking we would turn it on at night. It wouldn't have to be on when then room was in use. Timo