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Insulated Chase Construction
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.
(2.1 m)
Figure 12
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.
12
Roof Support
Attic Radiation
Shield
Firestop
6' 8"
(2 m)
Min.
7'
Min.
1/2" Plywood
Figure 13
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
Fireplace Side
Unbend to floor
and nail/screw
Nailing Flange
(2 places each side)
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)
SEE NOTE
Solid
Continuous
Surface
Outside
Base
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