R-Value Calculations - Ventus ME300 Installation And Operation Manual

3.4 R‐Value Calculations
There are two ways to calculate the R factor of the floor protection. First, by adding the R‐values of the
proposed materials or if some K and thickness values are given, by converting them to R values.
To calculate the R factor for a composite floor protection made of a combination of alternative materials,
simply add the R‐values of those materials. If the result is equal to or larger than the required R value, the
combination is acceptable. For R‐values of some selected materials, see Table Thermal Characteristics of
Common Floor Protection Materials.
Example:
Required floor protection R of 1.00. Proposed materials: four inches of brick and one inch of
®
Durock board:
(R = 4 x 0,2 = 0,8) plus 1 inch of Durock
This R value is larger than the required 1.00 and is therefore acceptable
In the case of a known K and thickness of alternative materials to be used in combination, convert all K
values to R by dividing the thickness of each material by its K value. Add the R values of your proposed
materials as shown in the previous example.
16
Four inches of brick
0.8 + 0.52 = 1.32.
Example:
K value = 0.75
Thickness = 1
R value = Thickness/K = 1/0.75 = 1.33
®
(R = 1 x 0.52 = 0.52).
ME300 ‐ Installation and Operation Manual