Condensation in Mobile Home

December 30, 2017

I live in a small 1985 trailer. We noticed that in our bedroom closet the wall is wet. I had to remove all the blankets I had stacked in it. There is not enough insulation. And how do I fix it?


There is no mold, but we did notice we had to fix the floor in that corner before we moved in and at first thought it was due to a leaky roof, but that is not the case. Thanks for any ideas.


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December 31, 20170 found this helpful
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Step 1
Look and make sure the home is on a concrete slab.

Step 2
If it is not, put a plastic sheet under the trailer. Hold it down with rocks.

Step 3
Remove a piece of panelling , the plastic should be visible.

Step 4
If your home does not have a plastic barrier, install one.

Step 5
Check for roof vents you need air circulating properly.

Step 6
Stop using a humidifier, as it creates moisture in the air.

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December 31, 20170 found this helpful
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You are going to need to buy insulation and install this in the back of your closet behind the paneling. You can either do this from the outside of the trailer or inside the closet itself. You might want to look first at the closet paneling and see if it is easy to remove or not.


If you crack or break the paneling when removing it, you'll need to buy new paneling to put in its place.

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January 30, 2010

My daughter heats her little trailer with a gas heater on the wall. This causes moisture to form on walls and windows and is causing mold or mildew. She can't afford another heater right now. What can we do to fix this problem. Just want you to know this is my favorite site to visit. Thank you.

By ruthie from OK


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January 31, 20101 found this helpful

I live in a mobile home, too, and we sometimes get condensation on the windows...but it's not from the heater. It's caused by windows that aren't completely shut. Double-check to make sure all the windows are tightly closed. If this doesn't work, there is an air leak somewhere.


There's a great forum for mobile home questions:

I found out about that site right here on, and it's been an invaluable resource for me. I hope it will help you out, as well!

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January 31, 20100 found this helpful

Condensation in your daughters trailer has nothing to do with windows that are not completely shut or leaking somewhere.
The trailer is very tight, which is good because it saves heating fuel. But it is also bad because water vapor is building up in the house with no place to escape, so it condenses on the cool windows. There is nothing wrong with the windows, either. A humidifier? That will make everything worse.


What you can do: Open the windows for five minutes in the morning and five minutes in the afternoon to release that water vapor. Install a dehumidifier.

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January 31, 20100 found this helpful

I've gotten rid of condensation on the window by covering them with shrink wrap plastic made for windows. You can buy it at the dollar store. I agree that a dehumidifier will help, but if you can't afford one, you could try running your vents in the bathroom and kitchen several times a day. Mold is a hazard and can cause many health problems. Make sure she cleans it with a good mold killer, and have her wear latex gloves and some kind of face covering or mask while she's cleaning it.

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January 31, 20100 found this helpful

The is dessicant (drying material) that you can get from the hardware store. It's used in basements - You can spray the mold with disinfectant spray to kill it.

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February 3, 20100 found this helpful

Your heater is probably not the problem.

It is the lack of insulation. To avoid tearing up your little trailer, the best insulation is blown in. Check your hardware store they may rent the necessary equipment very inexpensively. A dry form( use cellulose will fireproof also) or expanding type (use soy) Both will work about the same so check around and get the best price for the insulation.


If you don't want to do it yourself, have an insulation company do it for you. It should not be very expensive.

After you have insulated use a drying agent to remove the old moisture. To remove any mold wipe the area with a cloth soaked in white vinegar. Let it air dry.

Now open all your windows and give your trailer a good dose of fresh air. In about 2 hours your trailer will smell like 'new'.

To be sure you now have no leaks check with a candle near any opening. If the light moves, you have an air leak....mostly at windows or doors. Seal with caulk any windows or door that still leak.

Add storm windows or plastic storm windows to all your windows. When you have it all sealed I think you will find you no longer need a new heater. As with any gas heater, be sure it is vented.


It sounds like a lot of work, but should take just a couple of days over a weekend.

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June 3, 2018

How do I prevent condensation on the inside of a metal mobile home roof in very hot weather?


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June 3, 20181 found this helpful
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Are you saying just the roof area has moisture and no condensation on the walls?

  • For any condensation problem it seems the first consideration would be to purchase a dehumidifier as they will collect excess moisture.
  • Dehumidifiers of any size usually start at $100 and go up according to size and other features and can be purchased at Walmart, Home Depot, Lowe's, Ace hardware as well as online.
  • If your roof is not vented properly then this may be part of your problem.
  • It may also help to "air" out your mobile home a couple of times a day. Opening several windows or doors even 10 or 15 minutes twice a day will help.
  • Plastic film on your windows may help with any condensation in that area. This film is sold at most stores as well as the Dollar Tree.
  • Here is a link that has some other suggestions that you may be able to apply to help stop the condensation.
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June 3, 20180 found this helpful
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Keep the air circulating by placing a fan in the window to pull the air from the inside out. Or use a dehumidifier but this is expensive. Line the inside of the roof with bubble wrap. That will prevent the inside air from condensing on the cooler roof. Good luck.

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January 29, 2017

My mobile home roof is leaking water how do I fix it? There is no water on the outside of the roof. Could it be condensation?

Roof Leaking in Mobile Home - water on wall and wiring

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August 19, 2017

My closet is behind the AC unit in my house, and right now during the summer it gets hot in my closet and the back wall sweats and causes dampness through the room.

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December 9, 2008

We have lived in a trailer for 2 years and every winter we have been here the outside walls in the closet area and now to the front of the mobile is wet and showing small signs of mold. It only does it as it gets cold. The windows also steam up and get some black on them as well. The bathroom ceiling also gets small yellow spots on it.

Any idea what would cause all of this? the skirting on the trailer is very tight and there is no air flow under it, could this be the cause? Nothing like this happens in the summer and it is always the outside walls. Under the trailer is always damp as well, they have the dryer vented under their.


December 9, 20080 found this helpful

I have this problem also. I just moved in to our trailer and all the outside walls are wet..... The carpet in my bedroom also have a "wet" feel to it too.
Someone said that it is because the house is really "sealed" and the moisture from your warm interior and the cold of the poorly insulated walls dont mix.

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By (Guest Post)
December 9, 20080 found this helpful

You have a moisture problem. The warm humid air is collecting on a cold surface. Just like a wetness on the outside of a cold glass on a warm summer day. You have to open the window for 10 minutes a day to see if that helps or buy a dehumidifier.

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By Memere. (Guest Post)
December 10, 20080 found this helpful

I, too, live in a trailer Never, never vent your dryer under the trailer for the very reasons you stated. Moisture will build up and cause problems. You need to install a vent on the side (even if it routes through the underside. Double check often to make sure that once it actually is vented to the outside, that the connection doesn't loosen. Lots of problems solved.

I also keep my closet doors ajar, as they are on outside walls and get very cold in them without circulation from the house. Visit a store that specializes in mobile home items, etc. They can offer a great deal of advice and help you install proper vents, etc. Good luck.

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December 10, 20081 found this helpful

I used to live in a trailer as well and we always had problems, especially with the windows. I live in Minnesota so it was always bad. The problem is definately moisture and lack of proper air circulation. The warm air hits the cold walls/windows/whatever and it condensates. When this sits for too long then it will start to mold. My window frames were completely rotten in the place we lived and the walls were paneling with very little if any insulation in them. We had problems in our closets as well as anything up against an outside wall that would start to mold during the winter.

You can try covering your windows in plastic which should help with the window problem.
As for the bathroom do you have a ventilation fan in the ceiling or wall that pulls all the humid air out of there? Hot steamy showers are the culprit but unless you want a cold shower there isn't much you can do except keep the door open when you shower.
As for the closets you may want to either consistently keep the doors closed so the temperature is cooler in there or if not make sure you don't have a lot of stuff stacked on the floors so the air circulates.
I now live in a house and we moved our dresser in our bedroom to paint after it had been in the same spot (outside wall) for 3 years. We had black mold growing on the sheet rock behind the dresser because of moisture and lack of air movement.

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December 10, 20080 found this helpful

Condensation on the inside of your walls, since they are cold metal. All that water runs down and pools under your floor. Eventually it turns your particle-board subflooring to mush and you step through it to the ground. The only solution is to insulat it, but to do enough insulation to work, you need wider studs for thicker walls. Dern it. I know whereof I speak.

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February 3, 2017

What can I do to stop and get rid of condensation under my mobile home. The windows, walls, and floors get damp and I'm worried about mold building up and the wood starting to rot.

Please advise.

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February 11, 2015

We have a dreadful problem with condensation in our trailer roof. We have pulled down the ceiling, removed the insulation, and cleaned it up. We need to know now, how to fix it the right way. I am wondering if creating a "transition" (air pocket) like the one that exists in a wood attic, ie. "drop ceiling" like situation to create a larger air transition area would work.

Insulate right on top of that lowered ceiling. Rubber the inside, underside of the metal roof, to ensure against leaks, and top inhibit further condensation, as metal is a better temperature conduit than rubber. Will this work? We need to save this old trailer, on a budget.

By Betty

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March 1, 2012

I have stains all over this year, on my ceiling; I have a mobile home. The weather this year has been cold, to warm, and back to really cold. The way my house is, that one side gets the direct sunlight. The other side does not get it on the back end and that is where our ceiling is having a problem this year.

I first thought it was a leak in the roof, but this is all along the edges of my ceiling from my living room, to kitchen, and then my bedroom. My bedroom I know has a lot of moisture issues with even the walls and windows. I know they needed to taken out and recaulked; that hopefully will help that issue. This is the first year we have not had a heater in our bedroom. I think that played a part in it too. We have only one exhaust fan in house above stove so what can we do?

By popcorn from Middletown, DE

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June 4, 2019

Mobile homes are often not as insulated or moisture proof as a conventional home. This can cause mold and mildew to grow inside walls or in bathrooms or kitchen areas.

Cause of Mold Growth in a Mobile Home

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