CFM Corporation WMC36 WMC42 - Manual (Page 16)

16
WMC Series Woodburning Fireplace
20000583
COMMON MATERIALS AND FACTORS
MATERIAL K* R
MINIMUM
THICKNESS
EH2416
Common Brick
0.458
5.0
1.09 0.50 in.**
0.10 5.46 in.**
(CFM Corporation)
R Value is for Z\x inch.
* Units of K = BTU/SQ FT/HR/˚F/IN
** Thickness of Listed Material
FP533ADD
Addendum
6/1/99 djt
8/4/99 changed .2 to .1
one inch to 1/2 inch djt
Fig. 25 Hearth extension material factors.
FP533ADD
NEW K of new material (per inch) thickness
required = ------------------------------------ X of listed
thickness K of listed material (per inch) material
Example of Determining Hearth Extension
Equivalents
To determine the thickness required for any new mate-
rial:
Example for Common Brick
T (new) = 5.0 / 0.458 x 0.50 in. = 5.46 in. (new re-
quired thickness).
FP550
BR/BC - SEALING
DETAILS
9/29/97
Wall Covering
Noncombustible
Decorative
Facing
Noncombustible
Decorative
Covering
Seal all cracks
between fireplace
surround and wall
materials with
noncombustible
material.
Seal crack
between fireplace
and hearth extension
with noncombustible
material.
2x4" Header -
Do not notch at
standoffs.
Safety Strips -
Must be overlapped
¹⁄₂
" minimum.
Hearth Extension
Insulation
Side View
FP550
Fig. 26 Sealing gaps.