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What do you guys think of Blue Jean insulation does it work will in heat and cool?
Does it absorb moisture?

"Does it absorb moisture?"

hell yes and it's very hard to dry out. think of heavy blue jeans. you know the old saying "Cotton Kills".

And when wet it looses most of its insulating value.
Weight can also be an issue. Just for fun in my build I used cellulose fibers sealed in plastic bags. After I was done, I found foam beads that they used in bean bag chairs. If I was to do it again I would use that instead, again in plastic bags, (much lighter and fills odd shaped spaces).
The hard part about this method is you have to build the wall first, and drop in the bags of insulation as the wall goes up.
In my walls I have up to 3 1/2 inches of insulation. I went with heavy wood framing because when the windows were put in during the van conversion, they hacked out the frame members that support the roof. For the ceiling I used sheet foam as I did not want to lose a lot of headroom.

Why do you like the bean bag material and where do you get it?

I like it because it fills odd shaped voids and is very light. In my van I basically made the interior walls and then poured the insulation into it as the wall went up. Since the outside of the van walls have a curve to them and the interior walls do not, It would be hard to completely fill the space in between with sheet insulation. I put it in plastic garbage bags so that the plastic would act as a vapor barrier on both sides of the insulation. Also when putting the top wall panel in it needs to be in a bag so that you can put it in place and then the wall panel.
I did not completely seal the bags as I did not want them to expand and contract with altitude or weather changes.

I seen it in large bags at my local Walmart in the fabric department. Google bean bag fill. Several Walmart options came up.
Does it insulate well?
I didn't put anything in my van build that would absorb moisture.
Living in a sealed box makes moisture your enemy.
The ceiling and walls of my van build in this order...

-Stock sheetmetal
-Various thicknesses of 1/2"or 3/4" EPS, either single thickness or layered where applicable.
-1/8" rolled foil faced foam underlayment, duct taped at seams as a vapor barrier.
-1/4" paneling

I have some storage boxes that cover both wheel wells, these have 1.5" thick walls insulated with 1.5" EPS.
I didn't bother trying to stuff insulation down inside the lower portions of the walls. The vapor barrier and the boxes themselves insulate these areas from the living space.

The idea of anything shoved down into the lower parts of the van wall didn't sit well with me.
These areas are by design suppose to remain open and they have weep holes at the bottom to let out condensation. Adding anything to them interferes with this design and only serves to trap moisture within.
Polystyrene beads should not be used in wall cavities where they could come into contact with electrical wires. These beads may also not meet fire-safety codes unless they are treated with special fire-retarding agents.
This is why I get fed up with this site and go somewhere else for 6 months at a time.. People ask what I did or would do. I tell them and some "expert" will jump in and instead of say what they use will just criticize what others say. There is no perfect insulation, so no matter what anyone says that they use, some "person" can jump in and criticize instead of contribute. Cellulose is probably the safest, but it has drawbacks as well. Chemicals used to make things fire retardant are toxic. Google that. Here is one result search Youtube as well for insulation and burn. Here is another result

I don't know of any foam boards that will not burn when exposed to flame, or worse yet give off toxic fumes in a confined space, yet that is probably the number one insulation used in vans. To have a fire, you also need a good air supply. When a cavity is filled with material where is all this air going to come from? Vans are full of combustible materials. Your seats and bed are probably not made of metal or rock and are more exposed to fire from heaters and stoves , yet somehow people manage to survive. 12 volt electricity does not jump through it's own insulation to start short circuits. Higher Voltage house wiring is run through combustible material all the time in homes.

Condensation happens when there is a difference in temperature. warm moist air comes into contact with the cold surface. The air cools and can no longer hold as much moisture so the moisture settles on the cold surface. The purpose of the insulation is to make sure that the walls do not get cold. Add ventilation which any closed container should have.

See you all in 6 months.
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