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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 10
1/2" Plywood
Nailing Flanges
Four nailing flanges are provided to secure the
fireplace to the floor (see Figure 11). 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)
Figure 11
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 12).
Roof Support
Firestop
6' 8"
(2 m)
Min.
2. Non-combustible materials such as brick,
stone or ceramic tile may project in front of
and onto the fireplace facing (Figure 13).
Mantel
The mantel must be installed at least 45" (1143
mm) above the base of the fireplace (Figure 12).
Mantel
12" Max.
(305mm)
45"
(1143mm)
Min.
Figure 12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Storm Collar
Flashing
Draft Stops
Floor
Ceiling
Firestop
Wall
CTDT
Termination
• Must have the same firestopping
Note: Non-
resistance as adjacent wall.
Combustible
• Must have the same insulation as
Chase
Flashing
adjacent ceiling.
Must Be
• Follow local rules regarding framing
Used To
Cover
construction.
Chase
Opening
Drywall or Any Rigid
Material
2 x 4
1/2" Drywall
2 x 3 Min.
Spacer
Insulate Joists
Same As Ceiling
8'
8'
(2.4 m)
Level
Level
Insulation
(Thermal Barrier)
Non-Combustible Facing
1/2" Drywall
2 x 3 Min.
Spacer
Door
Figure 13
SEE NOTE
Solid
Continuous
Surface
Outside
Base
11
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