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Old 12-29-2014, 06:28 AM   #15
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Hypervent sounds like a good idea. I heard somewhere that the average sleeper puts out about a pint of moisture overnight.
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Old 12-29-2014, 08:58 AM   #16
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Condensation under bed??

That drymesh stuff looks pretty good too. I'd suggest that either that or hypervent would work well, especially in combination with ventilation to manage overall moisture buildup in the Airstream.
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Old 12-29-2014, 03:41 PM   #17
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Added the Reflectix.. worked really well... in fact, considered 'fixed'...

Portag is right on, tho.. ventilate, ventilate, ventilate. WE keep our bath vent open since we added the Vent cover... really changed the interior climate between uses.

Now, we do a fair bit of going in/out as it is parked in the driveway behind our home. WE do run the furnace... on low... when below 40 F. degrees, set to about 50F. As the air is heated.. it is a bit drier as noted by our remote thermometer/humdity gauge. When above 50F, it seems have enough heat/cool by ambient temps and things stay ok... I also have the de-humidifying chemicals in fore/aft locations... things stay drier than it seems in our home!!!

I am looking for a 'de-humidifier' that is electric.. have some really good suggestions from friends on this Forum... and will take the step as I think it will be better than using the 'chemical' style...primarily because it has ability to circulate the air..

Data may follow...
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Old 01-05-2015, 11:11 AM   #18
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I just discovered this issue after 12 days of cold camping with the bed over an unheated storage compartment with outside access. We controlled inside humidity, but a mold mildew problem happened under the mattress anyway. I am going to treat the bed platform with a anti-mold cleaner, then lightly sand the wood. I really like the DryMesh idea listed in this thread, and will probably go that route.

My question is whether I should treat the bed platform with Thomson's Water Seal after I get the wood cleaned, or just leave it alone?

Thoughts?


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Old 01-05-2015, 11:34 AM   #19
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Cannonball, get some ventilation to the rest of the trailer interior under that bed and ensure the exterior compartment seal is tight. I certainly wouldn't want to use a exterior preservative chemical like Thompson's Water Seal under my bed, or anywhere else in the trailer, for health reasons.
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Old 01-06-2015, 07:10 AM   #20
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By Jove! I think we've got it.

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With hopes this doesn't go too far off topic, we found a temporary fix to the moisture problem - rolled south to Jekyll Island. OK - it's not even a temporary fix but overnight lows in the mid- to high fifties is better than lows in the thirties in Virginia. Ah! Life is pretty good. It does take a bit of the urgency from the moisture barrier project. Perhaps we'll go find some fresh, sweet Georgia shrimp tomorrow.
Two days ago we finished the shrimp and I installed the Reflectix on our twin bed platforms. So far, so good. The overnight temperature last night was in the mid-forties. There was no moisture under or on top of the Reflectix. Tomorrow night's forecast is for a low of twenty-one. That will be a great test.

By the way, I chose to use carpet tape to secure the material to the platform - it's working well so far.

Thanks for the comments and the great information.
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Old 01-06-2015, 07:33 AM   #21
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If camping where there is electric hookups, I use a small 200 watt personal electric heater in the trunk under the bed. Small temp differential = no condensation generation. Between that and a dehumidifier, I have never had wetness under the mattress.
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Old 01-06-2015, 09:25 AM   #22
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When we first bought this Airstream I closed the external storage hatch that goes under the bed, forgot to turn off the light inside, and noticed light coming out from around part of the hatch seal.

Cold air had a path to the inside, a good risk of condensation in the area in cold weather. So I removed the little locking arm of the latch, bent it so it would close tightly, and put in back on. No more light peeking out, no more cold air going in.

Check the hatch seals.
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Old 01-06-2015, 09:32 AM   #23
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When we first bought this Airstream I closed the external storage hatch that goes under the bed, forgot to turn off the light inside, and noticed light coming out from around part of the hatch seal.

Cold air had a path to the inside, a good risk of condensation in the area in cold weather. So I removed the little locking arm of the latch, bent it so it would close tightly, and put in back on. No more light peeking out, no more cold air going in.

Check the hatch seals.
I wound up removing the bogus "seal" that AS installed and replacing with a double thickness EPDM tape seal (from big box store). I also ran a single thickness (thinner EPDM seal tape) in the piano hinge. I now have a 99% seal. I can run hose nozzle pressure and get just a drop or two in the piano hinge area, which runs harmlessly out onto the bumper.
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Old 01-25-2015, 10:07 PM   #24
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Step by step

Since my last post on this subject - "so far working pretty good" - the news is that with colder temperatures we did experience condensation under the mattresses. Overnight temperatures were commonly between low twenties and low thirties with condensation evident every morning. On one memorable night in Delaware we saw a balmy fifteen degrees overnight.

My next approach was to build a sandwich of Reflectix, closed-cell foam and a top layer of Reflectix. My choice for the closed cell foam was a half-inch layer of neoprene, the same general type used for wet suits.

We roll back into winter next week for a test. Will report victory (Yay!) or moisture (sigh).

By the way - with left over material I now have custom winter skylight covers.
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Old 01-25-2015, 10:19 PM   #25
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I'll be very interested to learn whether the condensation challenge can be overcome without Hypervent or DryMesh.

Meanwhile, I'll bring along an extra roll of Reflectix for our next camping trip, just in case.
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Old 01-25-2015, 10:37 PM   #26
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Interesting thread. Call me crazy but wouldn't simply lifting the bed up, either on its jacks or by propping it up while the temperatures were in transit solve the moisture problem? That should work when the outside air temp is cool / cold but I could see why if it's hot and humid outside and you want it cold inside the moisture could happen. But to me that would mean I just had a bad seal on my outside door. I'm so new at this though my bed is still wrapped in plastic! .
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Old 01-25-2015, 10:56 PM   #27
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Interesting thread. Call me crazy ..... But to me that would mean I just had a bad seal on my outside door. I'm so new at this though my bed is still wrapped in plastic! .
When you are inside your AS sleeping (after removing plastic wrap), your body heat and moisture your body naturally loses will be absorbed into the mattress. As that moisture is cooled by the underside of the bed which is usually unvented storage, the moisture condenses. PROBLEM!

You can totally seal the 'storage' area, but it will still 'cool off' because it is 'unheated space'. There is your target.

So, you can 'circulate' air through the 'storage' compartment to make it close to the same temp as your bed/trailer.... that will stop/minimize your condensation issue.

My recommendation, 'reflectix' insulation works ok for us in our 'moderate climate' by keeping the temperature from reaching 'condensation'/dew point.. point. We also added a 'mattress' cover which 'breathes' but blocks moisture... the hope is this will give more 'life' for the mattress which is realllllllly expensive.

On our AS, the 'hatch' on the rear is about 1 inch thick.. and has limited 'insulation'. In fact there may be NO insulation as far as i can tell because it transmits a lot of cold...but, my seal is pretty good...

If you 'push' air into the storage area from inside the AS, moisture will have a tendency to condensate on the inside of your storage area.. NOT a good idea!!! If you 'circulate' the air in and out, you will still get a chance for condensation due to the colder area, you may do just fine.... just have to work it...

If I ever take the 'hatch' door apart, I will probably fill with better insulation... till then, I keep it sealed as best I can and go with the bed insulation barrier... and keep a close eye on it...

One 'solution' would be to make another 'bed' layer on top of the existing so that you have some air space... then insulate UNDER the bed, inside the storage area to keep the cold from getting to the bed to begin with...

Lots of 'options'... good luck!
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Old 01-26-2015, 06:22 AM   #28
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Fascinating. In that "oh crap, I don't want to have to deal with this," sort of way. I haven't had the problem yet but being in the South moisture is a constant battle with everything. I'm convinced this place was entirely uninhabitable until the invention of the AC system.
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