General comment on insulation, partially
a propos of this discussion, perhaps more relevant to a couple of historical B-Van discussions, but this is a live (and lively) insulation-related thread, so I figured I'd make use of it:
Joann Fabrics is now selling
bulk Insul-Bright for $3.99 per yard. A year ago when I created the
tarp cover for our externally-mounted Yeti cooler, I couldn't get it. I could only find it online, in pre-cut packaged form, which had all the wrong dimensions for my application. I perhaps could have cobbled something together from what was offered, but it was also very expensive at that time, and I simply said to hell with it.
There have been discussions previously on what we really can expect in terms of R-values from some of the products that we use to bolster the insulation in our Interstates, whether it be windows or a galley cabinet or a Yeti or whatever else.
Reflectix has been widely cursed as over-representing what it can do, and the general feeling online is that its actual R value is close to 1 - not very effective at all, but it still gets applied quite a bit for lack of better alternative.
To my knowledge, the Insul-Bright manufacturer doesn't declare an R-value, but according to some of the claims on ultra-light backpacker forums, it might achieve an R value above 7, *if* it is applied in proper context.
Anyway, I'll be getting over to the fabric store as fast as my hot little legs can carry me. I need to make an under-tarp liner for our Yeti prior to our upcoming trip. I probably won't have time to experiment with things like window coverings, and I don't know if Insul-Bright will prove to be a game-changer, but at least it's a promising additional option at this point.