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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 12
1/2" Plywood
Nailing Flanges
Four nailing flanges are provided to secure the
fireplace to the floor (see Figure 13). 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 13
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 14).
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 15).
Mantel
The mantel must be installed at least 45" (1143
mm) above the base of the fireplace (Figure 14).
Mantel
12" Max.
(305mm)
45"
(1143mm)
Min.
Figure 14
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
1/2" Drywall
2 x 3 Min.
Standoff
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)
Non-Combustible Facing
1/2" Drywall
2 x 3 Min.
Standoff
Door
Figure 15
SEE NOTE
Solid
Continuous
Surface
Outside
Base
11
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