Isokern Standard 36 - Required Clearance to Combustibles

0” CLEARANCE
20”
MIN.
1 1/2”
No Combustible
Underpinnings
1 1/2”
Required Clearance to Combustibles
13
The replaces and DM chimney systems are tested
and listed for installation with “clearance to combustibles” as
follows:
The Isokern Standard and Magnum Series rebox
side walls and back wall require 1-1/2” clearance. (Figures 3
& 4)
The smoke dome front wall requires 0” clearance.
All DM chimney components require 0” clearance to
combustibles. (Figure 3)
Note: “Combustibles” are dened as “normal construction
materials” and are considered to be: wood framing materials,
particle board, mill board, plywood sub-ooring, plywood
paneling and wood ooring.
Sheathing materials, such as plywood, particle board
and drywall may cover the smoke dome front at 0” clearance.
All combustible sheathing materials that protrude beyond
front of rebox must be held 8” away from the sides of the
rebox opening and 8” above the top of the rebox opening.
Wherever insulation is used, the Fireplaces must
not be placed directly against it. Keep all insulation, vapor
barriers, “house wrap” paper and other insulating type
membranes and products, including berglass, cellulose
and other insulation, (anything that carries an “R” rating)
a minimum of three inches (3”) away from all rebox and
chimney surfaces.
Exception:
If insulation is used in walls surrounding the replace,
insulation may be installed behind sheathing of gypsom board,
plywood, particle board or other material on the side facing
the Isokern. The facing material cannot be within 1 1/2” to the
replace sidewalls.
Notes:
A. The replaces must sit upon a concrete support
slab designed to bear the total installed weight of the replace
and DM chimney system. These support slabs can have no
wood underpinnings. (Figure 4)
The replaces are rated for installation on a
combustible oor system when using the Fire-Lite application
only. See pages 46-51 for Fire-Lite installation instructions.
B. Concrete support slabs for replaces must provide
the noncombustible hearth extension substrate needed to
support the code required noncombustible hearth extension
nish materials. (Figure 4)
C. All replaces shall have hearth extensions of
approved noncombustible material such as brick, tile, or
stone that is properly supported, with no combustible material
against the underside thereof. Wooden forms used during
the construction of hearths and hearth extensions must be
removed when the construction is complete.
D. If a raised replace oor and raised hearth
extension are preferred, the raised underlying structure
must be built of noncombustible material and must sit on
noncombustible substrate.
FIGURE 3
FIGURE 4