Isokern Standard 36 - Fire-Lite Application - Hearth Conditions

1 ½” min.
25 ¼”
Fire-Lite Stand
4” or 8” Heights
Available
Combustible
Floor System
14GA. Metal Joists
@ 12” O.C. with a 3” Dia.
Hole for Air Dissipation
Noncombustible
20” Hearth Substrate
Air Dissipation
26 Gauge Metal
Safety Strip
8 ½”
MIN
Insboard or Inswool Cut and
Placed Between
Sections
50
The noncombustible raised platform must be set with a
minimum one and one half inch (1-1/2") clearance to the wall to
the sides and directly behind the Fire-Lite assembly.
Raised Platform:
Nominal four inch (4") metal base. (Figure 85). Set the
Fire-Lite base plate in a mortar bed on to the non-combustible
raised platform.
Metal safety strip - a generic 26 ga., four inch (4”) wide
galvanized metal strip - must be inserted to approximately two
inch (2”) beneath the platform at the front of the noncombustible
raised platform. The safety strips must extend out from the
front of the raised platform at least two inches (2”) and must
extend to at least two inches (2”) beyond the ends of the raised
platform. Any overlaps in the length of the safety strips should
be a minimum of two inches (2”) for continual coverage of the
combustible oor at the front of the replace (Figure 85).
The exposed combustible oor within the perimeter
formed by the noncombustible raised platform must be
completely covered with Inswool or Insboard ceramic ber
insulation (Figure 84). The Inswool or Insboard is dry laid to the
oor within the block perimeter.
The ceramic ber must have a thermal conductivity
rating equal to or greater than 0.4 Btu-in/hrsq. ft-degree
Fahrenheit. (Reference: Harbison-Walker, 600 Grant St.,
Pittsburgh, PA 15219, ph. 412-562-6200: “Insboard 2100” or
equivalent.)
Fire Brick Installation: Follow instructions on page 19 of this
manual.
Recessed Fire-Lite:
If the design preference is for a ush hearth Fire-Lite
application (oor of the replace at the same level the room’s
oor), with advanced planning, the metal stand can be lowered,
set and attached to the joist system. (Figure 86)
When calculating ush hearth height be sure to allow
for the four or eight inch (4” or 8”) metal stand, three inch (3”)
thick base plate plus the one and one half inch (1-1/2”) thick re
brick oor.
Whether a ush hearth is preferred or a raised hearth,
the combustible oor in front of the replace must be covered
with a noncombustible hearth extension set tight against the
replace front and extending at least 20 inches out from the
nished replace and at least 12 inches beyond the nished sides
of the replace opening.
For all “Fire-Lite” construction, it is necessary to use
the base plate. Be sure to secure the Fire-Lite metal stand to the
oor framing system, then mortar the base plate to the metal
stand for stability.
*For seismic anchorage design and instructions of the iush
hearth application, please contact the Technical Department at
1-800-642-2920.
Fire-Lite Application - Hearth Conditions
FIGURE 85
Noncombustible Hearth
Extension Required
20” min
Support Hearth Extension
With Noncombustible Material
Secure Fire-Lite
Stand To Trusses
Floor Framing
By Others
1 1/2”
min
1 1/2”
min
1 1/2”
min
SIDE VIEW
FRONT VIEW
PLAN VIEW
Hearth Extension
Required
12”
min
20”
min
Field Verify Dimensions:
Magnum Series:
28 55 3/4”W x 49 1/2”D
36 58 1/2”W x 49 1/2”D
42 65 1/2”W x 49 1/2”D
48 69 1/2”W x 49 1/2”D
Field Verify Dimensions:
Isokern Standard Series:
36 58 1/4”W x 46 3/4”D
42 64 1/4”W x 46 3/4”D
48 68 1/4”W x 46 3/4”D
Note: Field Verified Dimensions Should Make Allowance for Hearth
Extensions in Front (20”) and Sides (12” ea.) From Fireplace Opeining.
Also Fireplce Sides and Rear, 1 1/2” Clearance to Combustibles
** Consult Local Structural Engineer for Specific Structural Suppot.
Use Metal Flue Only.
FIGURE 86