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Old 01-27-2015, 08:28 AM   #43
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Low Tech Prevention

Never had condensation under the mattress and didn't want it so soon after bringing my 23 home, this is what I installed. Has worked great so far.
Got a half inch mat from the camping section of big box store. About 6 bucks. One roll of duct insulation, about $15. ?, it's reflective and has a self adhesive foam backing, so no "duct" tape needed. Used it on the inside of the storage door and the wheel well. Floor runner grey stuff to cover the floor areas under there. Also cut 2 access holes in the platform to put water heater in and out of bypass mode, without lifting entire bed platform and utilize otherwise empty forward space. Hidey Stash Hole, I call it.
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Old 01-27-2015, 08:15 PM   #44
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Step-by-step

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Originally Posted by Silvery Moon View Post
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.
Well, Silvery, so will I. Next week if we wake up with moisture under the bed the Hypervent will be the next layer.

Oh! That and a step stool to climb up and into bed.
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Old 01-27-2015, 08:30 PM   #45
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I'm thinking y'all just need to take a cold shower or something...

-Red, jealous that he doesn't have all the condensation everyone else is getting...
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Somebody ought to clean these windows. There is a tremendous buildup of gook all over them...
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Old 01-27-2015, 08:45 PM   #46
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I put two staggered layers of CostCo garage door insulation (silver aluminum on the upside and air bubbles on the on the bottom) of the mattress support board under the queen bed in our 25FB and did not have a moisture issue under the Rocky Mountain 8" foam mattress. I ran the insulation across the hinge and big gaps and just up the wall to stop the flow of cold air coming in by my head from storage locker under queen bed.
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Old 01-27-2015, 10:06 PM   #47
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I'm oddly excited to find out if I get it...
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Old 01-28-2015, 11:24 AM   #48
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Just to make sure, I'm sorely tempted to climb into the forward storage compartment and tape reflectix to the underside of all that plywood. Maybe I'll also tape some to the inside of the storage compartment door.

- SM, more reflectix and tape than sense
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Old 01-28-2015, 01:36 PM   #49
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You fit in the storage compartment? I need to go on a diet.
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Old 01-28-2015, 02:02 PM   #50
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I didn't say it would be pretty, haha.
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Old 01-28-2015, 02:11 PM   #51
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I wonder if putting a vapour barrier on the cold side (inside the storage compartment) might lead to condensation between the vapour barrier and the wood?
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Old 01-29-2015, 08:21 PM   #52
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That's what I can't figure out either TinTin. I would think the condensation would form on the warm side of whatever surface. So during the winter, you'd want a vapor barrier on top of the wood surface. During the summer, if it were a problem, you'd want it on the bottom.
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Old 01-29-2015, 10:08 PM   #53
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That's what I can't figure out either TinTin. I would think the condensation would form on the warm side of whatever surface. So during the winter, you'd want a vapor barrier on top of the wood surface. During the summer, if it were a problem, you'd want it on the bottom.
Condensation forms on surfaces that are colder than the air, because the air in contact with the cold surface is chilled below its dew point.

Pardon my rephrasing what you said, but I wanted to make sure I had it straight in my mind. Sounds to me like you're correct. If you've got cold air in the storage compartment and warm air inside the trailer, condensation would form on the warmer side of the wood provided the wood is colder than the dew point of the air.
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Old 01-30-2015, 03:52 AM   #54
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Yep. Like a cold beer on a warm summer day, the moisture forms on the outside, warm side. If of course it is allowed to sit long enough.
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Old 01-30-2015, 08:47 AM   #55
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...and the Reflectix under the bed is like a Coozi for your beer bottle.
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Old 01-30-2015, 10:53 AM   #56
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^^^^^HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAH^^^^

Man, that one REALLY tickled me. I actually LOL'd...

-Red, no, I'm serious, that's funny...
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