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Old 12-28-2018, 02:25 PM   #1
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Moisture Inside Along Slide-Out Wall

We have a 2104s and we were just camping in an area tha reaches almost freezing overnight. We noticed when folding up the murphy bed there was a lot of moisture/water along the strip behind the bed. We then investigated further and found the cushions in the dinette were wet behind them.

In addition all of the stripping along the roof edge had a little bit of water along the slide out and the stationary portions. One side of the slide out was wet also. One last place we found water was on the wood sills behind the sides of the u shape dinette.

All of it could be wiped down easily with a rag, but we arenít sure if this was caused by the extreme temps (as it wasnít on the other side) and we ran the heat or if we have a seal problem. We called the dealer and they said they have never heard of such a thing. The dealer is 3 hours from us and they said it would have to stay overnight. So before we commit to driving it and getting a hotel, we wanted to know if anyone has insight in this.

Thanks in advance.
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Old 12-28-2018, 03:07 PM   #2
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A lot of moisture forms using the propane heat. Cold air blowing on the slide might cause extra moisture to collect there. I use two of those Driz Air moisture collectors and they seam to cut down on the extra condensation. Dehumidifier would work, but I like what I use is no power when not using our unit and its parked. We do camp in ours in the winter. Been down to 16 degrees overnight several times.
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Old 12-28-2018, 03:44 PM   #3
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Quote:
Originally Posted by A32Deuce View Post
A lot of moisture forms using the propane heat. Cold air blowing on the slide might cause extra moisture to collect there. I use two of those Driz Air moisture collectors and they seam to cut down on the extra condensation. Dehumidifier would work, but I like what I use is no power when not using our unit and its parked. We do camp in ours in the winter. Been down to 16 degrees overnight several times.
Is this what you use?

Do they work well? We've also seen this. I was considering taking our dehumidifier with us the next time. We also camp in the summer when it's hot and humid (we live in the south). Do you think it would help with that?

https://www.amazon.com/dp/B07HF4DSH1..._bQOjCb11KQRVY
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Old 12-28-2018, 03:54 PM   #4
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Yes. They are what I use. Amazing how much moisture they can remove and they don't need power. Perfect for between camping trips and sitting.
I had to empty both of mine before I could take the RV home and that was a months worth just sitting.
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Old 12-28-2018, 04:05 PM   #5
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The propane furnace does not add moisture to the air, it dries the air or lowers the relative humidity (rH)!
The corners as you are experiencing are the first to get wet this is bec. of the over all low R factor found in RVs and the fact that especially in the corners the cold temperature travels straight through the aluminum framing and causes condensation. The only method to lower the relative humidity quickly and efficient is a compressor type dehumidifier. We have two 50 pint units, one in the bathroom and one in the living room / kitchen, they collect 2 gallons of water or more per day, you do not want this much water to accumulate inside the walls, ceiling and your mattress.
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Old 12-28-2018, 05:03 PM   #6
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Originally Posted by Cypressloser View Post
The propane furnace does not add moisture to the air, it dries the air or lowers the relative humidity (rH)!
The corners as you are experiencing are the first to get wet this is bec. of the over all low R factor found in RVs and the fact that especially in the corners the cold temperature travels straight through the aluminum framing and causes condensation. The only method to lower the relative humidity quickly and efficient is a compressor type dehumidifier. We have two 50 pint units, one in the bathroom and one in the living room / kitchen, they collect 2 gallons of water or more per day, you do not want this much water to accumulate inside the walls, ceiling and your mattress.
Good thing I didn't say adds moisture, but it does form using any kind of heat in winter.
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Old 12-28-2018, 06:16 PM   #7
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Tell everyone to stop breathing.. that'll help.

Yes, I'm kidding. This is what I tell my kids though.... They just roll their eyes at me. It's really quite funny.
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Old 12-28-2018, 06:48 PM   #8
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Here is a link to a site with some easy to read information regarding relative humidity.
https://www.engineeringtoolbox.com/m...ir-d_1403.html

The 2 columns on the right in the table represent 100% humidity in relation to the temperature in the left columns. It basically means when the room temperature is 20 deg. C (70F) and a cold corner in the RV measures only 0 deg. C (32F) that the air there can only carry about 1/4 of the water compared to the rest of the RV, if we can reduce the rH in the warm area to roughly 25% that would bring us below 100% in the cold part and stop the condensation - if this makes sense. The catch is if we lower the rH to far down we make the living conditions unhealthy for us and wood (furniture) can shrink and crack.
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Old 12-28-2018, 07:46 PM   #9
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Thank you for your insights. Sure wish the dealer had explained this. For now, we will look into a dehumidifier and not rush in for service.
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Old 12-28-2018, 08:23 PM   #10
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[QUOTE=tmlogo;1995748]Thank you for your insights. Sure wish the dealer had explained this. For now, we will look into a dehumidifier and not rush in for service.[/QUOTE

I have 2 more tips for you.
If you turn down the thermostat too low over night you're likely to get more condensation than if you dont, a couple degrees are probably no big deal.
There are 'value priced' dehumidifiers like Garrison or Noma that are very effective but noisy and there are others like the Bionaire that are whisper quiet and equally effective but twice as expensive. We keep the unit in the living room on 24/7 while the other one in the bathroom is on humidistat.
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Old 12-28-2018, 08:44 PM   #11
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[QUOTE=Cypressloser;1995776]
Quote:
Originally Posted by tmlogo View Post
Thank you for your insights. Sure wish the dealer had explained this. For now, we will look into a dehumidifier and not rush in for service.[/QUOTE

I have 2 more tips for you.
If you turn down the thermostat too low over night you're likely to get more condensation than if you dont, a couple degrees are probably no big deal.
There are 'value priced' dehumidifiers like Garrison or Noma that are very effective but noisy and there are others like the Bionaire that are whisper quiet and equally effective but twice as expensive. We keep the unit in the living room on 24/7 while the other one in the bathroom is on humidistat.
Thank you again. Well we had the thermostat turned way down, and then cranked up the heat at about 4:00am. Sounds like we did everything wrong to make it happen.
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Old 12-28-2018, 09:03 PM   #12
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Condensation

Hi, we have had a similar experience in late October of this year when the temperature got down in the mid 30's. Our solution was to buy a roll of Reflectix at Lowes (16inch X 25ft) and cut to length and placed it between the dinette cushions and the slide out wall. Did the same thing under the mattress where the pass thru is and in front of the mattress at the headboard area. Also took some 1/2 inch foil-faced foam sheeting board and (cut to fit) our ceiling area of the pass thru. Good luck and HAPPY CAMPING!
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Old 12-28-2018, 09:05 PM   #13
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The moisture from breathing when sleeping will condense on cool interiors of the RV. You also need to check the underside of the mattress. If the area under the platform the mattress sits on is not heated, you also need to check the bottom of the mattress for moisture as well. A few simple fixes can reduce the condensation. Place a foam pool noodle between the mattress and the wall this will allow circulation of warm air. Place a piece of 1/2 foam sheeting board ( any big box hardware store) under the mattress to prevent moisture under the mattress. Also crack a window at each end of the RV.
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Old 12-29-2018, 11:18 PM   #14
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We just went through this. We got a dehumidifier. 30 pints from walmart. We can maintain the humidity in the RV that way. Plus, before it gets too late in the evening we open up the closets and storage areas to let the air mix and air out. In our wardrobe slide we got some of those closet dehumidifiers, again, found at walmart. These are just small camprid type of moisture absorbents. This has pretty much solve the humidity issues. The ultimate cure for it is to move to a warmer climate in the winter. LOL (or stop breathing!!) But seriously, if you are going to run heat on the inside, you'll need some way to get the moisture out of your trailer or it will condense on your walls... much like a cool glass of water in the summer time...

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Old 12-30-2018, 03:47 PM   #15
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What we do - cold/humidity

Inside RV moisture generators: Showers, cooking, breathing, open and closed doors.

How to fix: open a ceiling vent - just a crack to let some warm moist air out. Lower the temperature and put on a sweater. We purchased a body pillow (actually two) to place between the head of the Murphy bed and the front trailer wall and one below that. Gives us a nice padded headboard for the bed and keeps the cold air out from the pass through storage areas.
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