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Old 10-30-2017, 03:17 PM   #1
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Condensation problem

Does anyone have an issue with moisture build up between the mattress and sleeping platform?
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Old 10-30-2017, 03:27 PM   #2
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Welcome to the forum.

Some have had condensation under the mattress in certain situations with some RVs. What RV do you have?

If you use the 'search' function for the forum, you may find answers quicker. If not and your current topic ('Condensation problem') doesn't get enough response, try another post with more specific information; maybe 'help - condensation under the mattress' or something like that.
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Old 10-30-2017, 03:41 PM   #3
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Congratulations on your 1st post. There are a ma y posts on the subject. A number of people like a marine product for this purpose. Unfortunately I do not recall the name of it.

Which htt do you have? How long are you out for?

In the early and late season, we get a bit under the matress and ignore it. When we pack up, the mattress and bunk end dry. We also open up when we get home to ensure everything dries out.
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Old 10-30-2017, 05:12 PM   #4
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I cured that problem on my boat by using Hypervent Condensation Prevention Matting, its pricey but works great, no more moisture. Someone else tried a similar building product in their hybrid TT with good results, Cedar Breather Underlayment from Benjamin Obdyke | Benjamin Obdyke, not sure where to purchase but a quick Google search should locate it.
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Old 10-31-2017, 02:28 PM   #5
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Thanks for the suggestions, I'll try it
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Old 11-03-2017, 10:40 PM   #6
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Hi, I use Hypervent under my mattress. It was costly but worth the price.
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Old 11-04-2017, 05:40 AM   #7
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I've had the problem spending winters in Florida due to cool nights and hot days. A lot of people don't even know it's happening under their mattress until they notice mold.

No need to spend a lot of money preventing it. I bought cut-your-own-size furnace air filter material at Home Depot. This stuff is 1" thick and something like 24" x 24". They are made out of some kind of natural fibers and are very stiff. I placed 6 of them between the mattress and plywood. You would think they would flatten out but they haven't after 3 years.

Another cheap solution some have used is wood lath like they used to use under plaster walls. Anything to let a little air get under the mattress, even if it's only during the daytime.
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Old 11-04-2017, 09:14 AM   #8
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Awesome suggestion! and welcome to the forum.

I suspect the 'furnace filters' may actually be evaporative cooler ('swamp cooler') pads. If so, it's a seasonal thing and you'll find it in lots of places (home improvement, hardware, W*mart) in the late spring, but may not see as much of it in the fall/winter.

That material is inexpensive and is available in shredded aspen wood and synthetic ('plastic'). For anyone with a condensation issue, it could be a cheap and easy solution. Certainly worth a try!
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Old 11-07-2017, 03:04 PM   #9
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retiredtech: Thanks for the suggestion. Sounds a lot less expensive than others!
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Old 11-18-2017, 03:10 PM   #10
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We have had condensation under the mattresses in our X17Z. I tried a number of different things but what seemed to work the best was simply insulating the area under the hinge flap. I use the foam insulation like people use around the edges of window air conditioners. It's like 2 or 3 inches thick and several feet long. Got it at Menards for a couple bucks, after spending much more on other fixes that didn't solve the problem. I'm thinking I'll maybe put pink insulation board under the mattresses next summer and see how that works too.
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Old 11-19-2017, 04:57 PM   #11
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If you can get under the bed try gluing or somehow attaching 1/2 inch or thicker foam insulation. The kind with foil holds up better than plain white foam.

There are several posts on doing this, use the search function to find the one that best describes your situation.

I used spray on adhesive ( messy, cover everything you don't want sticky) on both the bottom of the bed and the foam board that cut to fit.

Warning, flammable and lots of ventilation! Also, any insulation of the area below the bed will help.
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Old 09-17-2019, 11:12 PM   #12
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Quote:
Originally Posted by Wisco Dude View Post
We have had condensation under the mattresses in our X17Z. I tried a number of different things but what seemed to work the best was simply insulating the area under the hinge flap. I use the foam insulation like people use around the edges of window air conditioners. It's like 2 or 3 inches thick and several feet long. Got it at Menards for a couple bucks, after spending much more on other fixes that didn't solve the problem. I'm thinking I'll maybe put pink insulation board under the mattresses next summer and see how that works too.
Did putting pink foam insulation under your mattress work to get rid of your condensation issue?
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Old 09-18-2019, 06:42 AM   #13
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Did putting pink foam insulation under your mattress work to get rid of your condensation issue?
It did not eliminate the problem entirely, but it did help quite a bit. Insulating the hinge flap seemed to help the most (just gotta remember to remove it before closing up). The combination of those two efforts (the insulation board under the mattress plus insulation in the hinge flap) pretty much eliminated the problem. But it wasn't very convenient to set up and tear down. The ultimate solution was that I sold the trailer.
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Old 09-18-2019, 08:45 AM   #14
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Quote:
Originally Posted by Wisco Dude View Post
It did not eliminate the problem entirely, but it did help quite a bit. Insulating the hinge flap seemed to help the most (just gotta remember to remove it before closing up). The combination of those two efforts (the insulation board under the mattress plus insulation in the hinge flap) pretty much eliminated the problem. But it wasn't very convenient to set up and tear down. The ultimate solution was that I sold the trailer.
Thanks for getting back to us in this. May I also ask if this issue occurs only
when it is cold outside, or is it something that happens in the summer months too? We only just bought our new-to-us X17Z and haven’t actually used it yet - trying to advance troubleshoot!
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Old 09-18-2019, 02:08 PM   #15
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Thanks for getting back to us in this. May I also ask if this issue occurs only
when it is cold outside, or is it something that happens in the summer months too? We only just bought our new-to-us X17Z and havenít actually used it yet - trying to advance troubleshoot!
To be honest I don't remember precisely but I do believe it was worse when there was a big temperature differential between inside and outside, and yes, particularly when it was cooler outside. Also if the weather was just generally humid.
I really believe the main cause of the condensation under the mattress was due to air flow in the hinge area where the bunk ends connect to the camper. There's a velcro flap that you can open and stuff some of this in there (remember to remove it before folding up the bunk end) :
https://www.lowes.com/pd/M-D-3-1-2-ft-x-2-1-4-in-Gray-Foam-Air-Conditioner-Weatherstrip/1097853?cm_mmc=shp-_-c-_-prd-_-hdw-_-google-_-lia-_-145-_-weatherstripsoftgoods-_-1097853-_-0&store_code=2206&gclsrc=aw.ds&&gclid=EAIaIQobChMI r6m4tZTb5AIVicDACh1V7gcAEAkYASABEgLO-fD_BwE

That along with the pink insulation board seemed to help a lot. Actually I think you could even do without the insulation board, but it did make sleeping more comfortable, and every little bit of insulation to keep the air out helps.
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Old 09-18-2019, 02:17 PM   #16
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Old 09-18-2019, 09:22 PM   #17
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Originally Posted by MagooIsBoo View Post
Hi, I use Hypervent under my mattress. It was costly but worth the price.
Same here. Mine was drenched and now itís dry
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Old 09-23-2019, 08:46 PM   #18
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I have a 2013 x17z and have never had a condensation or moisture problem under the mattress. I have camped in cold, damp and rainy weather as well as hot and humid New England summer days and check under my mattress often.

The mattresses have fabric on the top side and vinyl on the bottom. We also use sleeping bags (I bought two for each bed, unzipped them and then zipped two together making one large sleeping bag).
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