rvupgradestore.com Composet Products Fridge Defend
RV Life Magazine RV Park Reviews RV Trip Wizard

Author Topic: Moisture under mattress  (Read 5020 times)


  • Posts: 3
Moisture under mattress
« on: August 16, 2014, 03:53:44 PM »
We have a new Jayco hybrid and have used it twice.  Each time we fold in the beds there is considerable moisture under the mattresses along the outer half of the bed.  We do not think it is leaking.  Is it condensation?  Is there a remedy for it?  Thanks for any advice.


  • ---
  • Posts: 5993
  • We don't camp. We tour.
    • Pumpkin and Us
Re: Moisture under mattress
« Reply #1 on: August 16, 2014, 04:39:44 PM »
Are you sure you didn't wet the bed?  :)
Are your mattresses vinyl covered?  If so, it could be there have been leaks (even on the dealer lot) and the mattresses have soaked up some water at some time or the other and it is being squished back out through the seams when laid on.  You might not feel it or get wet if the mattress is vinyl covered, but the water could have soaked in through seams around the bottom.  Just a thought.
Tom & Joyce and Ditto the "don't tell her she's a dog" Westie
U.S. Navy (Ret)
2014 Winnebago ERA 70X 24' class B Sprinter chassis


  • Administrator
  • ---
  • *
  • Posts: 45912
  • Celebrating 25 years of The RV Forum online.
    • RV Forum web site
Re: Moisture under mattress
« Reply #2 on: August 16, 2014, 10:33:02 PM »
We used to have something similar on a prior boat with a foam mattress. I finally figured it was moisture given off by our bodies getting wicked to the bottom of the mattress, which sat on a 'cold' surface. My inexpensive, but immediately effective, fix was to cut some large cardboard boxes and lay the cardboard flat under the mattress. This provided sufficient 'insulation', so the bottom of the mattress no longer sat on a cold surface.

FWIW my other half has re-covered numerous foam mattresses from boats of similar construction (same boat builder), and they always had mildew on the underside.
Tom.  Need help? Click the Help button in the toolbar above.


  • ---
  • Posts: 10112
Re: Moisture under mattress
« Reply #3 on: August 17, 2014, 12:48:05 AM »
If possible, it might help to put them out in the sun and let the moisture bake out of them.

:D :D


  • ---
  • Posts: 2006
Re: Moisture under mattress
« Reply #4 on: August 17, 2014, 08:13:27 AM »
Moisture was the primary reason we got out of a pop-up and anything with canvas.

Your mattress issue is most likely caused by condensation as noted by Tom, as that's fairly common. Any difference in temperature and humidity can create condensation inside the camper. After you return home, set up the camper on a sunny day and open the windows, maybe run a fan. Pull the mattresses to air out, and make sure everything is dry before closing it back up.
WARNING: This post may contain a chemical known to the State of California to cause cancer, or birth defects or other reproductive harm.


  • Posts: 3
Re: Moisture under mattress
« Reply #5 on: August 17, 2014, 07:30:28 PM »
Thanks for responses.  Will try idea to insulate under the mattresses to reduce condensation and dry things out well whenever there is.