HE200 - Installation and Operation Manual
41
A
noncombustible
floor
protection
with
R
value
insulation
equal
to
or
greater
than
1.00
must
be
installed
in
front
of
the
unit
up
to
20".
For
more
details
see
Section
6.3.2:
Minimum
Heart
Extension
Requirements
.
The
use
of
an
R
value
is
convenient
when
more
than
one
material
is
going
to
be
used
in
the
hearth
extension
to
cover
the
combustible
surface.
This
is
because
R
values
are
additive,
whereas
K
values
are
not.
To
find
the
corresponding
R
factor
to
use
for
some
selected
materials,
please
see
Thermal
Characteristics
of
Common
Floor
Protection
Materials
table.
CAUTION:
DO
NOT
LEAVE
CARPET
UNDER
THE
FLOOR
PROTECTION
IN
FRONT
OF
THE
FIREPLACE
6.3.1.3
R
Calculations
There
are
two
ways
to
calculate
the
R
factor
of
the
floor
protection.
First,
by
adding
the
R
‐
values
of
the
proposed
materials
or
if
some
K
and
thickness
values
are
given,
by
converting
them
to
R
values.
To
calculate
the
R
factor
for
a
composite
floor
protection
made
of
a
combination
of
alternative
materials,
simply
add
the
R
‐
values
of
those
materials.
If
the
result
is
equal
to
or
larger
than
the
required
R
value,
the
combination
is
acceptable.
For
R
‐
values
of
some
selected
materials,
see
Appendix
section.
Example:
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).
0.8
+
0.52
=
1.32.
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
the
R
values
of
your
proposed
materials
as
shown
in
the
previous
example.
Example:
K
value
=
0.75
Thickness
=
1
R
value
=
Thickness/K
=
1/0.75
=
1.33
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