6# vs. 8# insulation Tools, Tips and Techniques Discuss 6# vs. 8# insulation in the Pizza Oven Design and Installation forums; Originally Posted by vintagemx0 Just as a side note, R is the reciprocal of K. That is R = 1/K, ...

[lwood]

Originally Posted by vintagemx0

Just as a side note, R is the reciprocal of K. That is R = 1/K, and K = 1/R. I work with products that require thermal insulation protection and the useful value we use is K.

I agree, I can think about it easier in terms of K, thermal conductivity. Thermal conductivity is how well the material conducts heat. The smaller the K the better the insulator.

By the way, here is what wikp has to say about it:
* thermal conductance = k/A, measured in W·K−1·m−2;
* thermal resistance (R value) = t/k, measured in K·m²·W−1;
* thermal transmittance (U value) = 1/(Σ(t/k)) + convection + radiation, measured in W·K−1·m−2.