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Old 11-08-2014, 08:55 PM   #1
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2017 25' International
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Bed platform moisture

We are traveling in the Pacific Northwest for the first time in our new (to us) 2011 23FB trailer. We noticed the other day that the plywood platform under the mattress was very damp! I believe the problem stems from cold air in the exterior compartment right under the head of the bed coming in contact with the warm interior air. Seems like a design flaw on Airstream's part....We propped up the mattress and were able to get it to dry out, but we need a better permanent solution so mold does not grow in the future. Anyone else run into this and solve it?
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Old 11-08-2014, 09:14 PM   #2
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I never get good results searching here, but searching in Google returned this thread in the forums:

http://www.airforums.com/forums/f458...lem-85283.html

Good luck!
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Old 11-08-2014, 09:18 PM   #3
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Not an unusual complaint but we have never had it in some 30 months total sleeping in our Airstream, so I wonder why some have it and some don't.

For some reason the moist interior air reaches it's dew point at that location. One thing I noticed early was the exterior hatch to the under bed storage was not closing tight against its seal. That would allow cold air to enter the area under the bed and contribute to the problem.

You can check that seal easily by turning on the storage compartment light after dark, then see if the light is visible around the exterior of the hatch when closed. I took off the latch arm and bent it slightly so it would pull the door tighter.

Another solution may be to create an opening to that storage area from the inside so warm air can enter and minimize the temperature differential causing the dew point to occur there.

And of course ventilating the trailer with cracked windows or vents will ensure excess breathing, cooking and bathing moisture will not build up.
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Old 11-09-2014, 07:16 AM   #4
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This is a common problem in the RV and Marine world, although it's been better adressed with boat owners.

The condition is a warm moist environment (bed with two bodies) in contact with a cold surface. This result is condensation because the second law of thermodynamics says moisture goes from warm to cold.

There are several products on the market that promote air circulation:

Dry-Mat_Anti_Condensation_Layer

DRI DEK Dri-Dek Panels | West Marine

The alternative solution is insulation as in the above post, I would opt for the foil faced polyiso as in the link as it provides a good vapor barrier.
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Old 11-09-2014, 07:32 AM   #5
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A dehumidifier helps as well as a 200 watt personal electric heater in the under bed storage compartment. (On shore power, of course)
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Old 11-09-2014, 08:38 AM   #6
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The stuff from Hypervent (HyperVent Marine - Putting An End To Condensation) is what I would use.
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Old 11-09-2014, 10:35 AM   #7
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On our 2014 Eddie Bauer, there are two openings on the vertical portions of the bed platform on each side of the bed to allow easy access to tubs for storage. Those openings seem to be sufficient to allow air circulation under the bed so that you don't get as dramatic a temperature differential between the under bed area and the cabin of the Airstream. You might try making some similar openings. If you didn't want to make them as big as ours (to accommodate the storage tubs) I'm sure that smaller openings would work as well.
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Old 11-09-2014, 11:39 AM   #8
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AnnArborBob - did you have doors there that you removed?

Ours (27FB Flying Cloud) just has them as openings under the bed. We've never had the condensation problem and have had nights where it was in the 30s outside and toasty inside as well as hot summer days outside and cool temps with AC inside.
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Old 11-09-2014, 11:42 AM   #9
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I did three things that helped with moisture under the mattresses in both of my trailers:
  1. I have esophageal reflux, so I needed to elevate the head of the bed in both trailers. I cut long wedges out of a 2 x 4, about 3' long. I attached these equally spaced at the head end of the bed on top of the original bed platform, then cover the wedges with another layer of plywood. The air space between the wedges allows air to circulate under the mattresses.
  2. In the Safari (corner bed) I cut a 4" x 10" opening through the side of the bed frame then installed a louvered cover, which allows air to circulate into the storage space under the bed.
  3. Where the original seal was not contacting the entire perimeter, I installed a new storage hatch seal from ODM on the rear hatch on the Safari.
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Old 11-09-2014, 02:09 PM   #10
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Quote:
Originally Posted by SteveSueMac View Post
AnnArborBob - did you have doors there that you removed?

Ours (27FB Flying Cloud) just has them as openings under the bed. We've never had the condensation problem and have had nights where it was in the 30s outside and toasty inside as well as hot summer days outside and cool temps with AC inside.
We never had any doors there. I am assuming that the openings serve the dual purpose of providing access to the storage tubs and providing air circulation under the bed to avoid the moisture problem mentioned by the OP.

If someone didn't have these, if would be a piece of cake to cut some openings in the plywood base and install some vent grates if desired just as Alan above did. I would think that two openings about the size of a typical floor air vent in a house would be sufficient.
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Old 11-09-2014, 05:11 PM   #11
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All you need to do is buy a roll of Reflectix insulation at HD or Lowes and staple to the plywood under your mattress.


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Old 11-09-2014, 05:38 PM   #12
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All you need to do is buy a roll of Reflectix insulation at HD or Lowes and staple to the plywood under your mattress.
Which side of the plywood? The top next to the mattress or the bottom facing the storage compartment?
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Old 11-09-2014, 05:54 PM   #13
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No problems in our Airstream but we use the Hypervent product on our boat. Problem solved!
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Old 11-09-2014, 07:01 PM   #14
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On the top.....between the mattress and the plywood. This solved the issue when it happened on our 23fb. As soon as we got our 25fb I added the insulation and we haven't had any moisture issues.


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