R Calculations - Osburn STRATFORD Installation Instructions Manual

2.4.2.1 R 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
Appendix section.
Example:
Required floor protection R of 1.00. Proposed materials: four inches of brick and one inch of
®
Durock board
®
Four inches of brick (R = 4 x 0,2 = 0,8) plus 1 inch of Durock (R = 1 x 0.52 = 0.52).
0.8 + 0.52 = 1.32.
This R value is larger than the required 1.00 and is therefore acceptable
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