Pour in polyurethane foam.

[joelbert]

moisture

I would guess this would cause moisture to be trapped/held vs allowing to evaporate, but then again, only time will tell.

 

[Ducky's Dad]

why fill a wall with insulation?

Because walls are never airtight, and the insulation, whether foam or fiberglass batts or cellulose or whatever, is there to keep air from moving through the cavities.

Why are coolers filled with the same foam

Same reason, to keep air from moving around. And it provides some crush resistance to the flexible plastic shell. The crush resistance is not due to any inherent strength of the foam but is more akin to a series of millions of small balloons inside the plastic shell with the barometric air pressure providing the stiffness to the shell. Low pressure gas is pretty good at this, as witnessed by things like the X-Jack lifting your whole truck.

Also the outer surface of the tube will be coated in something like Acryl R SM5430 with aluminum sheet riveted to it. That leaves the rivets as the only direct, metal to metal path.

The aluminum sheet will act as a giant radiator if it's on the outside. The sheet will pull heat from the rivets and release it to the outside air.

 

[javajoe79]

Because walls are never airtight, and the insulation, whether foam or fiberglass batts or cellulose or whatever, is there to keep air from moving through the cavities.
Ok good info. Makes sense




The aluminum sheet will act as a giant radiator if it's on the outside. The sheet will pull heat from the rivets and release it to the outside air.

Also the outer skin will eventually be coated with something like Monstaliner so that should help a little too.

Aside from slight increas in stiffness, insulation and sound deadening, I am not sure it will be worth the hassle and expense at this point.

 

[Ducky's Dad]

If you can afford to give up the space, sheet the interior with a highly efficient foam panels, like polyisocyanurate. Even a 1/2" sheet will help a lot. R-value is about 6.0 per inch, but varies by manufacturer and by the chemicals that are used to blow the foam. Norm used to be about 7.5 per inch, but the the ozone greenies decided that the chemicals were blowing a hole in the atmosphere so we should all be colder and burn more fossil fuels to heat our homes. Idiots.

 

[monele]

I use expanding poly urethane at work all the time. My preferred source is http://uscomposites.com. Their prices are great and their product is excellent, though they don't sell froth packs, just stir and pour.

 

[javajoe79]

Thanks

 

[rayra]

You must be very careful when using expanding foam in a constrained space where the walls are flimsy or flexible. It will bulge the siding. You need to accurately gauge ow much you put in at the start and give it time to expand. Strat with something strong-walled while you get a feel for it. or practice on something you don't care about.