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MATERIAL
Ceramic tile
Concrete
Mineral wool insulation
Limestone
Ceramic board (Fibremax)
Horizontal still air (1/8" thick)
Exemple:
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).
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 R values
of the proposed materials as shown in the previous example.
Exemple:
K value = 0.75
Thickness = 1
R value = Thickness/K = 1/0.75 = 1.33
1
Horizontal still air can't be «stack» to accumulate R-values; each layer must be separated with another non-combustible material.
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CONDUCTIVITY (K)
PER INCH
1
0.8 + 0.52 = 1.32.
RESISTANCE (R)
PER INCH THICKNESS
12.5
1.050
0.320
6.5
0.450
0.135
Product Specification Manual - Osburn 1700-I
0.008
0.950
3.120
0.153
2.2
0,920**
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