Insulating Paint Additive Makes Paint Insulate
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The microspheres in the HY-TECH insulating ceramic additive have compressive strengths up to 6,000 psi, a softening point of about 1800° C., and they are fairly chemical resistant, with low thermal conductivity of 0.1 W / m / Deg.C.
The scientific process went one step farther and improved on the ceramic microspheres by removing all the gas inside which created a vacuum. Physics law states that nothing can move by conduction through a vacuum, since it represents an absence of matter. In effect we have a miniature thermos bottle... a microscopic hollow vacuum sphere that resists thermal conductivity and reduces the transfer of sound.
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My point was that, given the small surface area, with a relatively thin high-performance wall you could heat it with a large dog.
I don't know how to translate thermal conductivity to R-value.