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Seriously, is this a spammer?

I'm sure if someone searched, the post are all the same style, a drive by poster designed to get a response.
 

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I would say the best, thinnest, lightest insulation to use is gotta be Aerogel. :D

In all seriousness, you could write many books about what people have said about how to insulate a van. The big concern is not necessarily just keeping the van warm (or cool), but also about where moisture accumulates and what happens to it. Some argue that a permeable and hydrophobic insulation is ideal since it allows moisture to escape through the insulation layers.

Some folks use a 2 component spray foam to fill all the cavities and spaces. The hope here is that the closed cell foam forms a vapor barrier that doesn't allow the warm, humid inside air to reach cold surfaces where it condenses. I wouldn't call this easy, or inexpensive, but I've heard that some have gotten good result out of it.

Lots of builders use rigid foam insulation (usually polyisocyanurate, or polyiso for short), while sealing the gaps and cavities with something like one-part spray foam. This is the option I went with.

The one thing I'll say is that no option is really easy, since a van is a irregularly shaped metal box. Every bit of exposed metal is a thermal bridge to the outside, and even if you fill all the wall panels with R-million, heat will still gladly escape through exposed metal ribs. (The R-value of steel is 0.003 per inch).
 

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What is the best, easiest, thinnest,lightest insulation to use?
First of all lightness is not an issue in a van that can carry two tons.
second thinness is not an issue as the van can take 1-2” of insulation without compromising its space due to the ribs.
third Best? NASA has several insulating materials including aerogel that are better than you need and they are stupid expensive for a van.
fourth easiest depends on who is doing it. Spray foam is easy if you do it with your wallet but really tough if you DIY, Polyiso sheets are easy if you get a progun and Great Stuff and it can be the surface of the walls and ceiling with a layer of fabric or carpet attached, -no fitting of plywood. Thinsulate is easy if you don’t care how much you spend and are willing to cover every surface with a finishing material like plywood or tongue and grove which is hard.
You don't ask about cost? Really? What are you willing to spend on insulation?
 
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