EXAMPLE
OF
DETER3IINIYG
HEARTH EXTENSION
EQUIVALENT
b
determine the thickness reqrtircd for any material:
K
(New Material)
x
I"
=
Thickness Krrluirrd
.43
Example
for Insulatinp Board
-
KFAC
19
(K
from Figure
37)
.77
x
I"
=
-
I
.79
.43
Whatever thc lrriltcrial
uscd,
suffcirnl t!~ickiirss
roust
bc laid
down to maintain an eq~iivalcnt
K
factor.
Tlre thernral insulating layer may be covered
by
any non-
combustible material such as metal, tile, slate, brick, glass, con-
crete, marble or stone. When using
a
low density i~lsulatin~
material,
a supporting mctal cover, such as shown
in
Figure
38,
should befabricatcd and installed.
NOTE:
Some noncon~ln~stiblr
coverings such as metal, slate, ssi~dstortc a~~d rn;rrl,ls arc rela-
tively
eood conductors of Itrat and ntrlst be used in combinntion
,"
with dte more
thermally
resistant materials.
In
firlishing
up
the hearl!~
rxtrninn,
hr
sure to faster1
it
securely
to the floor to prevent shifting,
and
%?:\I
tti~
pp hrtween the
t'irrplnce frame and
thr
heart11 extension wit11
it
IIO~L-corllbuslible
malerial (see Fi.qt~n:
42).
METAL
COVER
DESIGN CONSISTS
OF
A
TOP
AND
4
SIDES
AS
REQUIRED
BY
DESIGN
NOTCHCORNERSTHEN
..
MATERIAL:
-.
A
,018
MIN. THICKNESS
(28
GA.)
GALVANIZED
-16.'
MIN.
OR
ALUMINIZED
STEEL.
I
&Ie!al
Cover
Construction
Figure
38
I
METAI, SAFETY
STRIP
OFFSET
(SIJPPLIED BY
OTIIERS)
\%%en thc fireplace and
tl!c
hrnrth rxir!!si<>n nre not ir;sr:rllix!
at
the same height, a custoln
snlcty
strip
i~
required.
Tl~r sz~t'r~y strip
must
beconstruc~edof_ealvanixrdstecl
rvitlr
n
rninir!lr~m thicktress
f
.O!S.
It sl~ot~ld
be
s!i;iprd
as
shovy!i
ill
Figure
39
al;d I:i:it~rc
10
shows a s:lrrrple of this type of ii~slallntio;~.
hletal
Safety
Strip
Offset
Figure
39
FIREPLACE
ON
COMBUSTIBLE
--
PLATFORM
HEART3
EXTENSION
ON
COMBUSTIBLE
FLOOR
19
,,
;,:;J
-
I
1';;.
I
:
\,
'.-
OPTIONAL
NON-COMBUSTIBLE
DECORATIVE
FLOOR
COYERlNG
COMBU511SLE
FLOOR
COVERING
\
1
SPECIAL
HEARTH
EXTENSION
'
METAL
SAFETY
OR
EQUIVALENT
STRIP-OFFSET
I
Clean
Face
RIodel
Shown
Eigure
40
1
VOS-COAIUUSTIRLE DliCORATIYI COVEKIXC:
Sl~ould be at least
3/8'
thick aild rncrt local butldil,~ code require
nrc:nti.
The
fit>is!iid height
L'i11,e
hcnrrl~ extension n~isr not
block
the irtlrr grille
nr
the
Lottonl
nl'tlie firepl;~ce.
IRK:
IIEAKI'H ESTENSIOX
31AY
BE
1U-
STALLED OYLY
AS
1LLUSTR~ATI':I). FIGURES
10
THROT'i211
A?
SHO'lC
0I''I'IOXhL
ISSTIl.LhTIOSS.
f i r e - p a r t s . c o m
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