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Insulated Chase Construction
Attic Radiation
Shield
NOTE: It is recommended that
the chase walls and floor be
insulated in the same manner,
using the same insulation, as
the rest of the building, below
the attic.
7'
(2.1 m)
Min.
Figure 9
1/2" Plywood
Nailing Flanges
Four nailing flanges are provided to secure the
fireplace to the floor (see figure below). Bend
the nailing flanges down so that each flange is
flush with the floor, then using nails or screws,
secure the fireplace to the floor (2 places each
side). The heads of the screws or nails must
be large enough to completely cover the holes
in the nailing flanges.
Fireplace Side
Unbend to floor
and nail/screw
Nailing Flange
(2 places each side)
Mantel and Facing
The mantel must be installed at least 39'' (990
mm) above the base of the fireplace (Figures
7b and 11).
Roof Support
Firestop
6' 8"
(2 m)
Min.
Facing
1. Combustible material must be installed
flush with the fireplace. It may not project
in front of and on the fireplace (i.e. the
steel facade of the fireplace) (Figure 10).
2. Non-combustible materials such as brick,
stone or ceramic tile may project in front
of and onto the fireplace facing up to the
tiling flange (Figure 13).
Fireplace Frame Section
1
2
1. Fireplace
2. Tiling flange
3. Wood frame (2" x 3" min)
4. Drywall
5. Tiles or brick
Figure 10
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Storm Collar
Flashing
Floor
Ceiling
Wall
• Must have the same firestopping
resistance as adjacent wall.
• Must have the same insulation as
adjacent ceiling.
• Follow local rules regarding framing
construction.
Drywall or Any Rigid
Material
2" x 4"
(Top View)
3
4
5
Insulate Joists
Same As Ceiling
Draft Stops
Firestop
CTDT
Termination
Note: Non-
Combustible
Chase
Flashing
Must Be
Used To
Cover
Chase
Opening
8'
8'
(2.4 m)
Level
Level
Insulation
(Thermal Barrier)
Mantel and Facing (Side View)
Mantel
Drywall
2 x 3 Min.
(51mm x 76mm)
Spacer
39'' (990 mm)
Rock Board
or Other
Noncombustible
Facing
Drywall
Rock Board
or Other
Noncombustible
Facing
Figure 11
SEE NOTE
Solid
Continuous
Surface
Outside
Base
11
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