Osburn 2400 Insert - Minimum Masonry Opening, Clearances, and Floor Protector

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Thermal characteristics of common floor protection materials*
MATERIAL
CONDUCTIVITY (k)
PER INCH
RESISTANCE (R) PER INCH
THICKNESS
Micore
®
160 0.39 2.54
Micore
®
300 0.49 2.06
Durock
®
1.92 0.52
Hardibacker
®
1.95 0.51
Hardibacker
®
500 2.3 0.44
Wonderboard
®
3.23 0.31
Cement mortar 5.00 0.2
Common brick 5.00 0.2
Face brick 9.00 0.11
Marble 14.3 – 20.00 0.07 – 0.05
Ceramic tile 12.5 0.008
Concrete 1.050 0.950
Mineral wool insulation 0.320 3.120
Limestone 6.5 0.153
Ceramic board (Fibremax) 0.450 2.2
Horizontal still air** (1/8") 0.135 0,920**
* Information as reported by manufacturers and other resources
** For a 1/8" thickness. You cannot «stack» horizontal still air to accumulate R-values; you must separate each later of
horizontal still air with another noncombustible material.
2.7 Minimum masonry opening, clearances to combustibles, and floor protector