17
Majestic Fireplaces
®
SR/SC Series
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.**
(Majestic Products
Company)
R Value is for
¹⁄₂
inch.
* Units of K = BTU/SQ FT/HR/˚F/IN
** Thickness of Listed Material
FP533ADD
Example of Determining Hearth Extension
Equivalents
To determine the thickness required for any new
material:
NEW
required
thickness
K of new material (per inch)
K of listed material (per inch)
thickness
of listed
material
=
x
Example for Common Brick
T (new) = 5.0/0.458 x 0/50 in. = 5.46 in. (new required
thickness).
Fig. 24 Hearth extension material factors.
FP550
Fig. 25 Sealing gaps.
;
;
;;
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.
2 x 4" HEADER -
Do not notch at
standoffs.
SAFETY STRIPS -
Must be overlapped
¹⁄₂
" minimum.
HEARTH
EXTENSION
INSULATION
SIDE VIEW
