23
US
Floor protection
Alternate materials may be rated with C-factor (Thermal Conductance) or k-factor
(Thermal Conductivity) ratings which must be converted to R-value to determine if
the alternate material meets the tested requirements. The following instructions
provide the proper information and formulas for conversion to R-value.
To determine if alternate materials are acceptable follow this sequence.
1. Convert material specifications to R-value.
a. R-value given – no conversion necessary.
b. K-factor is given with a required thickness (T) in inches: R = 1/k x T
c. C-factor is given: R = 1/C
2. Determine the R-value of proposed alternate floor protector:
a. Use formulas in step 1 above to calculate R-value of proposed material(s).
b. For multiple layers, add R-values of each layer to determine overall R-value.
3. If the overall R-value of the floor protector system is equal to or greater than the
floor protector specifications given, the alternate is acceptable.
Definitions:
Thermal conductance (C) =
Thermal conductivity (k) =
Thermal resistance (R) =
