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Insulated Chase Construction
NOTE: It is recommend-
ed 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.
27-1/2"
(699 mm)
Figure 10
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
43"
or nails must be large enough to completely
(1092 mm)
cover the holes in the nailing flanges.
Fireplace Side
Nailing Flange
(2 places each side)
12
Roof support
Attic firestop
7'
(2.1 m)
Min.
7' 4"
(2.2 m)
Min.
1/2" Plywood
Fireplace Facing
The fireplace should be framed using 2" x 3"
(50mm x 75mm) or heavier lumber.
Figure 9 on Page 11 shows the general
framing layout.
42"
(1067 mm)
Combustible materials must be installed flush
with the fireplace facing. They may not project
out in front of the fireplace. Non-combustible
materials such as brick, stone or ceramic tile,
may project in front of and/or on the fireplace
facing.
Unbend to floor
and nail/screw
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Flashing
Non-combustible
Insulate Joists
chase top
Same As Ceiling
Ceiling / floor
separation
Draft Stops
Firestop
• Must have the same fires rating as
CTDT
adjacent ceiling.
Termination
• Must be insulated same as adjacent
ceiling.
• Local code regulation for ceiling
Note: Non-
must be applied to the ceiling / floor
Combustible
Chase
separation i.e. firestop, etc.
Flashing
Must Be
Used To
Cover
Chase
Opening
Finished wall
Base if required.
Figure 11 - Facing (Side View)
8'
8'
(2.4 m)
Level
Level
Insulation
(Thermal Barrier)
Drywall panel or Equivalent
2" x 3" (50mm x 75mm) Minimum
Spacer
Fireplace
SEE NOTE
Solid
Continuous
Surface
Outside
Base
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