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MATERIAL
®
Micore
160
®
Micore
300
®
Durock
®
Hardibacker
®
Hardibacker
500
®
Wonderboard
Cement mortar
Common brick
Face brick
Marble
Ceramic tile
Concrete
Mineral wool insulation
Limestone
Ceramic board (Fibremax)
Horizontal still air** (1/8")
* 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 layer of horizontal still air with another non‐combustible material.
3.5 Minimum Heart Extension Requirements
The hearth extension floor area must extend at least 16" (41 cm) in front of the hearth (A) and at least 8"
(20 cm) on each side of the door opening (D). The joint between the hearth extension and the fireplace
hearth needs to be made of non‐combustible material such as sheet metal (not included).
ME300 ‐ Installation and Operation Manual
Thermal Characteristics of Common Floor Protection Materials*
CONDUCTIVITY (k)
PER INCH
0.39
0.49
1.92
1.95
2.3
3.23
5.00
5.00
9.00
14.3 – 20.00
12.5
1.050
0.320
6.5
0.450
0.135
RESISTANCE (R) PER INCH
THICKNESS
2.54
2.06
0.52
0.51
0.44
0.31
0.2
0.2
0.11
0.07 – 0.05
0.008
0.950
3.120
0.153
2.2
0,920**
17
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