To
deternine the thickness reauired for
2ny
material:
K
New
Material)
X
I"
=
l%ch?ss
Required
.84
Exa~.?ie
for
irsularing Board
-
.WAC
!9
(K
from
?igi:r-
25:
Whatever he material
ase?,
sufficient tiliciaess
most
5%
laid
i(~wv
to mainkia
an
eqi~i\.ai~nt
K
facto;.
The
:l~emal itlsulating iayer
may
be
coverd
hy
an?
non-
cornbastihie material such as
nctal,
!ile,
s!stc,
brick.
glass. cnncrete,
marble
or
stofit.
7Vhr;l
~lsJng
s
1;u.
densitj-
iitsulating
material,
2
sa~p3itin~
nsta!
cove:
such
as
shown
in
Fisure
27
sl?oilld
he
fabricated and
installed.
NOii:
Some noncombustible coverings ssuctl
as mehi. slate, sandstone
md
marble are relatively good
cortducton
of
heat
ad
must
br
ussd
in cornhination wi:h
the
more
ther~naiiy resistant mil:erials.
In finishing up
the
hearth extension,
be
sore
to
fzsten
it
sccure!y to the floor
to
prevent shiftin:, md spa1
&I-
gap
between
the
firepiace frame and
d~z
hearth exteosion
with a non-sombus:ible material
(See
Figure
>a).
I
I
I
MRAL
COVEa
DESIGN
CONSISTS
OF
4
TOP AN3
4
SIDES
FIGURE
27
I
METAL
COVERCQXSTRUCTION
Shoold
be
ei
least
318"
tinick 2nd meet
H.1J.D.
and/or
local building code
requirements.
Tne
finished
height
of
the hearth extension must not bioch
the
inlet
g~lle
at
the
bottom
of
the fireplace.
LfFT4L
CSFETT
STRE-OFFSET
iirT'r"1,IED
BY
o-rems)
\?Am
:!::
(i:,
place
and hcarin extension
a;.
no!
in.
stalled
nt
the same height,
a
custsm safety skip
is
re-
quired.
The
safety
strip
mst be cor.structed of
nized
steel
aith
a
minirnvm
thich~s;
"f
.Oi?
it
Ehnlild
be
shaped
as
shown
in
Figure
28.
1
METALSAFETYSTRLP-OFFSET
I
1
FIREPL.4CE
AND
HEARTH
EXTENSION
I
R1Aitl'J3G:
HEARTH
EXTENSION
MAY
BE
15-
STALLED
ONLY
AS
1LLUSTRATF.D
m-rcm~s
27
Tgaovon
32
sHUW
OPTIONAL
ihST.4LLATIONS.
f i r e - p a r t s . c o m
To Next Page
Loading...
