Apimaye Beehive Set - Single Brood BoxR 6. 93 Insulation The R value is a measure of thermal resistance, or ability of heat to transfer from hot to cold, through materials. The higher the R Value, the more a material prevents heat transfer. The most noteworthy feature of our beehives is the R 6. 93 insulation. Standard 3 4 thick pine wood used for building a beehive has an R value of about 1. 04, so for a wooden beehive to have same insulation its walls have to be 5. Double layer