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Old 01-29-2014, 01:17 PM   #1
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2011 23' FB International
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Condensation under bed??

Currently have a 2011 International 23 FB with an external storage trunk that is directly under the bed platform. Left Durham NC Jan 3 for a 2-3 month trek thru Fla. Took a week to get to Canopener with the lowest
temp in transit at 4F.
Noticed significant moisture/condensation on the bottom of the mattress and the top of the (plywood) platform. Both areas were very wet. Is this typical for winter travel? Did not notice this problem lastyear.
Any suggestions for managing this problem???
Thanks for the help.
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Old 01-29-2014, 01:24 PM   #2
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I had the same issue on our 23FB. After a little research on the forums I installed a layer of Reflectix insulation on the plywood. No condensation since then. You can buy that insulation at Home Depot or Lowes, and I just stapled it to the plywood. Some folks install wood slats across the plywood to create an airspace between the plywood and the bottom of the mattress, but so far the insulation has worked for us.
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Old 01-29-2014, 01:57 PM   #3
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We had a similar situation with our 25FB a number of years ago. We solved it with a similar resolution as CaptainNecro. We used foam rubber flooring material glued to the bed board. This also provided extra insulation from drafts under the bed. This worked so well for us that we have already done the same improvement to our new 23FB.

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Old 01-29-2014, 02:37 PM   #4
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This is a result of warm, moist interior air meeting a cold surface which drops the temperature to its dew point. It condenses there.

A vapor barrier on the warm side is a solution but who wants to sleep on a sheet of plastic. Additional insulation may help. Or provide warm air or heat to the space under the bed; that may be done by opening or removing storage doors, or directing heat into the area.

But if air is condensing under the mattress, it may also be condensing in other areas inside the shell where the dew point is reached, which may run down into the wood subfloor. So the best solution is to lower humidity in the trailer by opening vents or cracking windows open.

You should also be sure the exterior access doors under the bed are fitting snugly to their seals. We found two of these doors on two different new trailers slightly open, by turning on the interior storage light at night and seeing light around the door. Easy fix by bending the latch slightly to pull it tight.
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Old 01-29-2014, 03:26 PM   #5
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Quote:
Originally Posted by dkottum View Post
A vapor barrier on the warm side is a solution but who wants to sleep on a sheet of plastic.
Actually, you might want to. Get a Mylar "space blanket" and place it under the mattress. It will reflect your body heat back up to you, allowing you to sleep warmer, as well as serving as a vapor barrier to help control condensation. And since it's under the mattress, not over it, you won't feel like you're sleeping on a piece of plastic.
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