Hearth and Home Technologies Indoor/Outdoor Gas Fireplace Twilight-II-B - Manual (Page 23)

23 Heat & Glo LifeStyle Collection • Twilight-II-B • 2108-900 Rev. M • 11/08
Apply housewrap or building paper
For placement of combustible housewrap or building pa-
per and non-combustible sheathing for the outside wall
see Figures 7.5 and 7.6.
Special care should be taken when choosing building
materials for weather proofi ng (i.e. building wraps, seal-
ant tapes, liquid sealants, rubberized fl ashings, etc.).
All sealant materials or building wraps installed within 6
inches of the top and sides of the fi replace surround must
be approved to a minimum temperature of 225º F con-
tinuous exposure. Consult the material’s manufacturer to
ensure product compliance.
Figure 7.6
METAL FLASHING TOP OF SURROUND
EDGE OF SURROUND
6 IN.
6 IN.
Figure 7.5 Outside View without Non-combustible Sheathing Shown
* NOTE: All fi nishing materials on top of exterior sheathing
must be non-combustible for a minimum of 12 inches
above and on both sides of the exterior face of the
appliance. This non-combustible fi nishing 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 8.5).
** NOTE: Combustible house wrap or building paper
MUST NOT extend over the outside of non-combustible
sheathing, and MAY extend over the fl ashing behind non-
combustible sheathing. 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 sides of the fi replace surround
must be approved to a minimum temperature of 225º F
continuous exposure.
Figure 7.7 Non-combustible Zone (Exterior)
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-combus-
tible defi nitions.
Once the appliance is in place use enough high tempera-
ture silicone sealant or manufacturer specifi ed sealant
(approved to a minimum of 225º F) to make a water tight
seal between outdoor surround and exterior sheathing.
Face the perimeter of the appliance with non-combustible
sheathing over shroud fl anges and fl ashing. See Figure
7.7 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
12 in.
FLASHING
HEADER
2-3/4 in. 2-3/4 in.
12 in.
= NON-COMBUSTIBLE ZONE
= SHEATHING