15
Outdoor Lifestyles by Hearth & Home Technologies • TWILIGHT-II-MDC Installation Manual • 2369-970 Rev. L • 8/19
Apply housewrap or building paper
For placement of combustible housewrap or building pa
-
per and non-combustible sheathing for the outside wall
see Figures 5.5 and 5.6.
Special care should be taken when choosing building
materials for weatherproofing (i.e. building wraps, seal
-
ant tapes, liquid sealants, rubberized flashings, etc.).
All sealant materials or building wraps installed within 6
inches of the top and 1 inch on the sides of the fireplace
surround must be approved to a minimum temperature
of 225 ºF continuous exposure. Consult the material’s
manufacturer to ensure product compliance.
Figure 5.6 Outside View Showing Non-Combustible Sheathing
METAL FLASHING
TOP OF SURROUND
SIDE OF SURROUND
1 IN.
6 IN.
Figure 5.5 Outside View without Non-Combustible Sheathing Shown
* NOTE:
All finishing materials on top of exterior sheathing
must be non-combustible for a minimum of 10-7/8 inches
above and 2-3/4 inches on both sides of the exterior face of
the appliance. This non-combustible finishing material can
be up to a maximum of 6 inches thick (6 inches maximum
horizontal overhang) to allow for brick and stone alcoves
(see Figure 5.5).
** NOTE:
Combustible house wrap or building paper
MUST
NOT
extend over the outside of non-combustible sheath
-
ing, and
MAY
extend over the flashing
behind non-com-
bustible sheathing a maximum of 1 inch. Use high temp
silicone or sealant recommended by the manufacturer of
the housewrap to seal between combustible sheathing
house wrap and non-combustible sheathing. The sealant
material used within 6 inches of the top and 1 inch on the
sides of the fireplace surround must be approved to a
minimum temperature of 225 ºF continuous exposure.
Figure 5.7 Exterior Installation Prior to Finishing
Risk of Fire
• Non-combustible clearances must be main-
tained.
• Sheetrock, wood or other combustibles must
NOT be used as sheathing or facing in the non-
combustible zone.
• See
Sections 3 and 8
for proper clearances.
• See
Section 1
for combustible /non-combusti
-
ble definitions.
Once the appliance is in place, use enough high tem-
perature silicone sealant or manufacturer specified sealant
(approved to a minimum of 225 ºF) to make a water tight
seal between outdoor surround and exterior sheathing.
Face the perimeter of the appliance with non-combustible
sheathing over shroud flanges and flashing. See Figure
5.7 for non-combustible zone.
WARNING
APPLIANCE
TL-TRIM KIT
HOOD
TOP HOOD
TOP OF
FIREPLACE
16-5/16 in.
WALL STUD
HOUSEWRAP
INSULATION
HOUSEWRAP
**
(BUILDING
PAPER) OVERLAP
FLASHING 1 in.
SHEATHING,
COMBUSTIBLE
FIREPLACE
HEADER
INSULATED
FRAMING
STANDOFF
NON-COMBUSTIBLE
*
SHEATHING
10-7/8 in.
FLASHING
HEADER
10-7/8 in.
= NON-COMBUSTIBLE ZONE
2-3/4 in.
2-3/4 in.
= SHEATHING
= 1 INCH HOUSEWRAP OVERLAP
FLASHING
SHEATHING
NON-COMBUSTIBLE ZONE
