What is “k” or “R” that I see in the Manufacturer’s installation instructions?
ANSWER 10 –Thermal conductivity, identified as “k” is the amount of heat (in Btus) that will flow in one hour through one square foot of a uniform material one inch thick for each degree (0F) of temperature difference from one side of the material to the other – the larger the “k” value, the more heat energy that can be conducted through the material and the lower the “k” value, the less heat that can be conducted through such material. The measurement “k” of thermal conductivity is directly applicable to a single material but when more than one material is joined to form a composite material (i.e., ceramic tile over “cement board”), it is necessary to first convert from “k” to “R” (“R” is the “thermal resistance” and “R” values for different materials in a composite can be added whereas “k” values cannot be directly added when dealing with composite floor protection materials). To convert “k” to “R”: “R” = actual inches of thickness of the material ÷ “k” To convert “R” to “k”: “k” =
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