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Old 04-22-2016, 09:45 PM   #11
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I added 1" blue foam insulation under our mattress that we sleep on last year and it did help with relieving the condensation problem under the mattress. I am going to do the same under the other one this year, already have bought the foam insulation.

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Old 04-24-2016, 08:37 AM   #12
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It's been years since we had a pop-up but in the last 3 5ers I have always put dehumidifiers in them and run it when we were out of the unit. As I am sure you know moisture is an RVs worst enemy. Good dehumidifiers are not expensive especially when you consider the cost of your RV and any damage/work that moisture may cause.

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Old 04-24-2016, 09:08 AM   #13
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If you have a vinyl covering on the bottom of the mattress, you should check and air it regularly. While in cold weather the moisture from your body still travels through the mattress but instead of condensing on the bed platform it condenses on the inside of the vinyl. You may not see it there. When I had my popup, I took the mattress out after each trip and let them air out in the truck bed.

Originally Posted by cheeseheadjim View Post
THANKS, Flybob !

I'll try out the foam or other insulation under the mattress. Now that I think about it, my pop-up mattresses were covered in vinyl on the bottom - probably to help stop the condensation.

p.s. - THANKS for your service in Vietnam !!!! All of you vets have my profound gratitude

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Old 04-24-2016, 01:54 PM   #14
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Originally Posted by awhitlow2000 View Post
It's been years since we had a pop-up but in the last 3 5ers I have always put dehumidifiers in them and run it when we were out of the unit. As I am sure you know moisture is an RVs worst enemy. Good dehumidifiers are not expensive especially when you consider the cost of your RV and any damage/work that moisture may cause.
Unfortunately, for those of us who mostly dry camp or boondock, these aren't of any use.
Unless you can run your generator all night.
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Old 04-25-2016, 01:50 PM   #15
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This is really a problem of temperature and humidity. As long as you keep the surface temperature inside the unit above the dewpoint there will be no condensation. If it is 65 degrees in the RV with 30% humidity any surface below 33 degrees will have condensation. Change the relative humidity to 40% and the dewpoint jumps to 40 degrees. Tough to keep the beds warm enough so usually easier to manage humidity by dehumidification or ventilation.
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Old 05-05-2016, 12:00 PM   #16
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Our experience on condensation and mildew

We dont own a pup, but we do own a 37 ft. Wildwood travel trailer with a bunk in steamy humid Florida. And, when rainy season comes, or if it is really humid outside, condensation is a problem even with a larger TT.

Our solution at first, which may work for you in a pup, is to get those small dehumidifiers like Eva-Dry, some of which are just calcium chloride, and a few of which run on 120V AC, and can be set up for continuous use.

We used to use these plastic bucket passive dehumidifiers for our TT, but found they were not enough, so for the last few years, we have used a 120 VAC powered 45 pint GE dehumidifier, which is left plugged in 24/7 and set to 55% RH.

We set it up in the shower when we leave, with an extension cord (yes, the shower is dry) and the drain hose feeds to the shower drain. So, the interior never gets too humid and no mildew grows.

Before we installed the dehumidifier, one weekend we arrived and found mildew growing on every surface from the floor level up about 2 feet. It took a while to clean up every square inch inside the TT. So, we bought the dehumidifier that weekend. Sure, our monthly power bill is an extra $30 more than it would be at our weekend place, but given the thousands we spent on the travel trailer, it makes sense to keep it clean and dry.

Further on preventing mildew and odor, which can result if condensation builds up in any RV, there are products that contain stabilized chlorine dioxide (sodium chlorite), which when humidity increases releases a mild form of chlorine gas that will prevent odors from developing in your RV, pup or trailer. They are sold in the form of sachets that you hang up inside the RV. When the humidity increases, the chlorine is released and the inside stays fresh. It does not damage any fabric or materials in the RV, and we have used them extensively and often. Here is on the those products on Amazon:

hope these ideas are helpful to you. They work in sultry, steamy Florida, and are unnecessary in northern climes where humidity is not an issue. It's an issue here, 10 months out of 12.
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Old 05-05-2016, 12:02 PM   #17
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Quite by accident I found that if I left the second A/C unit fan turn to "on", not "Auto" during the cold nights there was no condensation on any of the windows in the morning. The furnace part of the other unit kept us warm but we always had lots of condensation inside the windows, especially in the mornings. I have Tinnitus and sleep with some sort of ambient noise all the time so I don't hear the ringing. I forgot my small noisy fan on a recent trip, so I turned on the bedroom A/C fan to "on" for the noise, and discovered the side effect. Of course this works if you are on shore power and have a second A/C unit. During storage we use DampRid from Home Depot and it works fine here in Texas during the winter; just change them out when needed.
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Old 05-05-2016, 12:12 PM   #18
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We've always used those refillable DampRid containers, both in our pop-up when we had it, and now in our 5er (use 2 in the 5er, one near the bedroom/bathroom with the doors left open while in storage, and one near the other end)

You just need to refill them every few weeks depending on temps/humidity (esp. here in FL where 90+% humidity is common)
Just make sure to not leave them long enough for the container section to overfill, (the "sticky water" is a pain to clean) and make sure they're secured when travelling.
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Old 05-05-2016, 12:19 PM   #19
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As I've read in many replies, creating air circulation works the best. We keep the create a breeze fans on low and that helps a lot.
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Old 05-05-2016, 12:41 PM   #20
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Absolutely the best solution to humidity issues I have found in all my years RVing!

amazon Eva Dry

And the best part? no sloppy dessicant to spill (don's ask me how I know about that )

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