FP1LM
Manoir
‐
Installation
and
Operation
Manual
17
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
layer
of
horizontal
still
air
with
another
non
‐
combustible
material.
1.3.3
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).
