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Opinions on moisture control with thinsulate
#1
I have a hightop van (crusaire chronicles in the build thread) and Im planning on insulating the roof with thinsulate covered with a fabric headliner. The roof is woven fiberglass, my plan is to spray it with adhesive and apply the thinsulate, then spray the thinsulate and apply the fabric. I need to keep it thin beacause I want to keep the interior standing height. 

This weekend I camped outside of glacier and had a substantial amount of condensation inside. I cooked and ran a buddy heater which I know both produce moisture, I plan to install a webasto heater when I rebuild it.

Do you guys think with a proper working fantastic fan running while cooking that the insulation and headliner plans will work? I dont want moisture building up creating mold or glue failure. I hope that the thinsulate will provide enough of a barrier that the condensation will be prevented...
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#2
I have no experience with this thing but you might wanna check it out.  If I was having a moisture problem this would be something I would try.  https://www.amazon.com/dp/B0725ZY75F?psc=1
If we were meant to stay in one place, we'd have roots instead of feet. My little place on the interweb - Cyberian Radio 

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MTNomad (10-22-2017)
#3
Better to prevent humidity than try to remove it.

You need lots of ventilation in any case, regardless the insulation.

Getting a full vapour barrier takes specialized material - nothing like Thinsulate - and means sacrificing a lot of interior space, even then not easy.

The Webasto will help, get rid of Buddy asap.

Run it very hot for long stretches with ventilation once in a while without people inside.

Avoid humid+hot locations.
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#4
on overhead installations isn't the Thinsulate going to want to pull apart because of gravity. I use Ensolite against the fiberglass and then the material. highdesertranger
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#5
(10-22-2017, 03:15 AM)Motrukdriver Wrote: If I was having a moisture problem this would be something I would try.

I have one and it works well. Pulls lots of power so best used as an opportunity load.  I don't see any solar on top of the van now so that might have to come later.  

OP:  I think a roof vent on low (pulling in when cold) and a second screened ventilation port somewhere would help keep the moisture down.  I ended up putting a range vent on one of my rear doors.
The thinsulate would probably stay up.  Not so sure about the headliner.  Let us know what happens. 

Onlookers:   here's the link to his Crusaire Chronicles build thread.
frater/jason @ Quartzsite
blog | Promaster van | offtopic answers
"I would unite with anybody to do right; and with nobody to do wrong" F. Douglass
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#6
Ventilation is really the only cure for condensation.

Or moving south where it's warmer.

Living in "Ziggy the Snail Shell" since May 2015
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#7
I have a pair of windows in my high top as well as the roof van.

When I'm cooking I use all three to evacuate the hot moist air. Unless it's cold and rainy, I also leave the side passenger door open to provide ventilation.

I also limit the amount of steam caused by cooking by using some backwoods techniques. Rice for example is only on the stove for maybe 5 to 8 minutes. Then it's allowed to sit for the rest of it's cooking time, hence no steam production. Potatoes, pasta and veggies, same thing.

When using my Mr. Buddy, I warm up the van, then turn it down to pilot or low depending on the outside temp. But then I would rather add a layer of clothing than overheat the van. I don't seem to have a problem with high moisture with the Mr. Buddy so I must be doing something different than those who find they have condensation issues...strange!

I also wouldn't be in favor of using something like thinsulate, particularly for a roof/ceiling application. It's not closed cell foam so it will absorb not only moisture but also smells, dirt etc.  It's also not a long strand insulation so it will separate from itself under load/stress. This and then headliner material would be a recipe for disaster IMO.
Worry is a misuse of imagination!
 
Build link: http://www.cheaprvliving.com/forums/Thre...g-Arabella
Full-timer again as of November 24, 2015 - 14 glorious years on the road before that!



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frater secessus (10-22-2017)
#8
(10-22-2017, 09:26 AM)highdesertranger Wrote: on overhead installations isn't the Thinsulate going to want to pull apart because of gravity.  I use Ensolite against the fiberglass and then the material.  highdesertranger

Thanks for all the input guys, much appreciated. Might look at other options...

Highdesertranger did you use the peel and stick or a spray glue type application? Did you cover it with fabric?
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#9
I have always used contact cement to attach the Ensolite. the peel and stick is fairly new and I have not tried it. I always use 3M 90 for adhesive, well I used to use the non-aerosol but you can't get the good stuff any more in CA. highdesertranger
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#10
Ill try and source a piece locally. Does it conform to curves well? Ill try and snap a picture of what Im working with...
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