We have a '94 U300 and have a continuing issue with moisture forming between the bottom of the bed and the engine bay plywood cover. I'm sure this must be an issue for others. Does anyone have a fix? We have just now laid down a 4 mil plastic sheet which we hope will be a vapor barrier of sorts. Thanks for any advice.
We have never hasd that issue in any of our three coaches.
This is very strange. We've never had a moisture problem. I would wait awhile and then check the plastic and see if the moisture is on the top or the bottom because the plastic probably won't stop it but will tell you where it is coming from - the bottom of the mattress or up from the engine compartment. If it is coming from the engine compartment, I'd want the vapor barrier on the bottom of the engine cover. If it is coming from the mattress, I'd want to know why.
Rich
Is the coach sitting where it could be coming from the ground.
Where is your coach located (i.e. what state or city)? High humidity weather environment? Been raining, or dry recently?
What kind of mattress? Conventional spring, memory foam, "sleep number", old school air mattress?
What is the mattress cover material on the bottom side?
Does the moisture that forms have any color or odor?
When you lift the bed platform up, is there any sign of moisture on the engine side?
Is this a new problem, or recurring?
Very strange...in 4 years on the Forum, first time I've read of this problem.
What type motorhome do you have?
See initial post: '94 U300.
It's condensate, cover the platform with indoor-outdoor carpet, worked for us.
Never experienced that in a MH, only in a boat. Here's what we used.
HyperVent Marine - Product Information (http://www.hyperventmarine.com/products.html)
What is the condition of the insulation on the bottom of the engine compartment cover?
As others have said, I have never heard of this before. If there is moisture it has to come from
somewhere. Condensation forms in a damp atmosphere on a surface that is cooler than the
air around it, as I understand it. Or moisture can come from a leak, water could be coming in
from the outside from an area that needs to be recaulked around the back of the coach. I hope
the vapor barrier will give you an answer. If you are in an warn, damp area check drain from the ac.
Carter-
This is not unusual in boats. Cold water, warm bodies. Condensation on the fiberglass below mattress.
Have not experienced it in a motorhome, but guess conditions could exist that could cause it.
Condensation below the matress is much better than "condensation" on top of the mattress...😬😳
What is the outside air temperature where the coach is?
Moisture will migrate and condense on the weakest link, typically the windows. Is the engine losing water or a leaking furnace flue allowing extremely high humidity levels to rise to the top of the bed platform from the engine bay, more likely a undiscovered roof leak dripping on the bed.
Another possibility for air beds only, pinhole leak in bottom of mattress. Moisture from the compressing process will accumulate at the bottom of the mattress.
Or a water bed Phred. LOL
Never heard back from the OP on this subject after that one-and-only post.
Industrial strength Depends?? >:D
No sweat!!
Talk about getting SEASICK, oh man can you imagine
how it would feel to try to get a nap on a waterbed in
the back of a FT on the road. Scary ! Glad they are out
of style now.
Carter-
Hello everyone,
You wouldn't by chance have a roof vent cracked open going down the road would you? I had a friend who left the vent open on a humid day going down the road and the back bedroom floor would get wet. Just a thought.
Dave's not here.