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05-07-2018, 10:42 AM
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#1
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Junior Member
Join Date: Sep 2017
Location: Milwaukee
Posts: 6
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Moisture under mattresses
Hey all, I am new to the forum, and have a 2016 X23B.
I have just completed several weeks of study on the dampness under the mattress issue. My steps are below, but my conclusion is it’s the mattress materials or construction, not the camper itself that causes the dampness. For reference we have the folding Denver Mattress Teddy Bear mattresses. Also note that this is UNDER the mattress, not above where venting the canvas or running fans will make any difference.
The first thing I tried was reflectix. Woke up in the morning to a lot of dampness.
The next thing I tried was the wool army blanket. Wet.
The third thing we tried was large (1”) bubble wrap. Wet.
The fourth thing I tried was sheets of 1” thick foil backed foam insulation sheets. Wet.
Then I tried carpet, like the rectangles little kids sit on in daycare. Wet.
The most recent solution I tested under the mattress was an air bed. I hate them and I hesitated to spend the money on one, but I did. While I will say I slept pretty well with the regular mattress on top of the air mattress I was disappointed to wake up and find wet between the mattress and the air mattress. In fact, the air mattress left MORE water between then than anything else.
The last thing I did was to put the thing on the floor and lay on it for a while. Wet underneath. Other Jayco owners who don't have the Teddy Bear mattresses, like the ones that are vinyl backed, don't seem to have this issue. This is the case even when they have the same model or a similar one that presumably uses the same door/bed. This leads me back to the mattress. Any other thoughts? And the Hypervent/Aire-Flow mats are $100/bed which I don't want to spend if all the other supposed solutions didn't work, either.
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05-07-2018, 10:47 AM
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#2
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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Unfortunately, you need a new mattress. Considering what you've done so far, seems like the only viable solution. Good luck!
__________________
2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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05-07-2018, 11:47 AM
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#3
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Senior Member
Join Date: Apr 2015
Location: Michigan
Posts: 2,650
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I can tell you the Hypervent does work. I had the same problem on my boat and tried several things like you did to no avail, someone mentioned Hypervent and we have been high and dry ever since. You need the thermal break with airflow or its never going to be dry no matter which mattress you use
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05-07-2018, 11:48 AM
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#4
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Senior Member
Join Date: Sep 2011
Location: King George
Posts: 2,761
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I guess my 2008 Starcraft 14R/T trailer has a standard mattress. Never heard of the Teddy Bear Mattress before... Did this come with your trailer?
I have the standard mattress with a 3-inch foam topper on it that I added. I also have the Two Foot stick-on CARPET SQUARES like from LOWES on top of the wood floor of the pull out tent bed. All is dry here when sleeping on it...
My mattress and foam topper must be alittle higher than normal as when the roof comes down on top of it touches the foam topper and slightly depresses it... My two ceiling light fixtures leave a depression mark on the mattress foam topper...
Makes me always make sure the ceiling lights cannot come on when the roof is down...
I guess you are saying others that have the Teddy Bear Mattress does not make moisture under them???...
Roy Ken
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Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
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05-07-2018, 11:58 AM
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#5
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Senior Member
Join Date: Dec 2015
Location: Arizona
Posts: 2,324
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Hypervent Fisheries Supplies!Like 12 bucks may give it a try! Thanks
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05-07-2018, 12:06 PM
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#6
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Junior Member
Join Date: Sep 2017
Location: Milwaukee
Posts: 6
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Yes, the mattress came with Jayco hybrids starting in 2016. The bed suface is also not wood, like a pup, fiberglass and metal.
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05-07-2018, 12:07 PM
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#7
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Junior Member
Join Date: Sep 2017
Location: Milwaukee
Posts: 6
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Quote:
Originally Posted by bdreinv
Hypervent Fisheries Supplies!Like 12 bucks may give it a try! Thanks
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$12/liner foot at 39" wide, which is about $100 per bed
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05-07-2018, 12:08 PM
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#8
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Junior Member
Join Date: Sep 2017
Location: Milwaukee
Posts: 6
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Quote:
Originally Posted by RoyBraddy
I guess my 2008 Starcraft 14R/T trailer has a standard mattress. Never heard of the Teddy Bear Mattress before... Did this come with your trailer?
I have the standard mattress with a 3-inch foam topper on it that I added. I also have the Two Foot stick-on CARPET SQUARES like from LOWES on top of the wood floor of the pull out tent bed. All is dry here when sleeping on it...
My mattress and foam topper must be alittle higher than normal as when the roof comes down on top of it touches the foam topper and slightly depresses it... My two ceiling light fixtures leave a depression mark on the mattress foam topper...
Makes me always make sure the ceiling lights cannot come on when the roof is down...
I guess you are saying others that have the Teddy Bear Mattress does not make moisture under them???...
Roy Ken
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Yes, the mattress came with Jayco hybrids starting in 2016. The bed suface is also not wood, like a pup, fiberglass and metal.
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05-07-2018, 02:39 PM
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#9
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Senior Member
Join Date: Aug 2017
Location: Howell
Posts: 141
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Ron, the big difference here is that your pop up has a plywood bunk. Plywood breathes where the fold down beds on the hybrids have a composite door that transfer heat/cold but doesn’t breath.
__________________
2018 Mesa Ridge 2410RL
2018 JayFeather x23B
2007 JayFeather 19H (sold)
2003 Jayco Kiwi 23B (sold)
1991 Jayco Cardinal SD 14 foot pop up. (Sold)
2014 Chevy Silverado Crew Cab LT Z71 5.3L 4WD
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05-07-2018, 07:36 PM
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#10
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Senior Member
Join Date: Nov 2016
Location: Vernon
Posts: 103
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I have 2013 Jay Feather x17z with standard vinyl backed mattresses and sleep in sleeping bags and moisture has never been a problem. I unzipped two standard sleeping bags and zipped them together to make a queen size.
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05-07-2018, 07:59 PM
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#11
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Senior Member
Join Date: Apr 2017
Location: Victoria
Posts: 172
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I bit the bullet and bought the hypervent. Works wonderfully and definitely worth the cost. Even with sheets, memory foam topper and duvets, mattress bottom stays dry.
__________________
Jayfeather 16 XRB
Ford Explorer V8
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05-07-2018, 09:10 PM
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#12
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Senior Member
Join Date: Aug 2013
Location: Bellingham,Wa.
Posts: 6,680
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Quote:
Originally Posted by jimovernon
I have 2013 Jay Feather x17z with standard vinyl backed mattresses and sleep in sleeping bags and moisture has never been a problem. I unzipped two standard sleeping bags and zipped them together to make a queen size.
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X2
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2010 Jayco Hybrid EXP21M
2013 Toureg TDI
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05-08-2018, 04:18 PM
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#13
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Member
Join Date: Jun 2017
Location: Omaha
Posts: 46
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As long as you have cool air on one side (ie. outside) and warm moist air on the other side (ie warm body and moisture from breathing and skin evaporation) and nothing to absorb the moisture between (composite board instead of porous plywood) the moisture will condense on the warm side of the bed board because of the cold on the other side. Just like noninsulated windows in winter.
Same thing happens on boats people sleep on, cooler water outside the boat and moisture from bodies on the other side. Happens in tightly sealed tents overnight also.
Mattress types don't have anything to do with with it.
As long as I am able to flip the mattresses up each day such as when we travel, I don't worry about it.
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05-08-2018, 04:44 PM
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#14
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Senior Member
Join Date: Mar 2018
Location: New England
Posts: 122
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It is odd that some people never have a problem with condensation under their mattress and others have an ongoing problem. I only have it when we snow-bird in Florida. Just goes to show there are other variables at play.
Anway, here is what has worked for me on my last 2 trailers. Cheap, too. About $5. Old fashioned wood lath, 1/4" thick, 1 1/2" wide, 4' long. Laid crosswise 8" apart. The lath isn't thick enough to feel through the mattress, but enough to let some air flow and keep it a little off the plywood. Can't say this will work for everyone.
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08-06-2019, 11:30 AM
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#15
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Senior Member
Join Date: Jun 2015
Location: --
Posts: 2,392
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For those of you that used the Hypervent solution, how long did you cut the product? The same size as the mattress? Longer then the mattress? A little smaller then the mattress?
I'm thinking longer would be better as the airflow would be unimpeded by mattress sag?
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2023 Ford F-150 XLT SCREW 3.5EB (Max Tow Pkg., Black Appearance Pkg., Bed Utility Pkg.)
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08-07-2019, 04:55 AM
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#16
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Junior Member
Join Date: Jul 2018
Location: Michigan
Posts: 18
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I cut mine to the size of the mattress. 60”
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08-07-2019, 09:49 AM
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#17
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Senior Member
Join Date: Sep 2018
Location: Wheaton
Posts: 156
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Had the same problem. Next trip I installed they hypervent and never had a problem since.
I measured the platform. So it extends a touch more than the mattress. I'm guessing either way you cut / measure is fine.
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