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Thermal characteristics of common floor protection materials*
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
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