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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.
Figure 15
Chase Enclosure
A chase is a vertical box-like structure construct-
ed to surround the fireplace and chimney. Refer
to Figure 15 for a typical chase configuration.
As with all chimney installations, avoid overhead
obstructions such as trees, power lines, etc.
A chase should be constructed and insulated
just like any outside wall. In a cold climate, we
recommend the base of the chase should also
be insulated between the solid continuous floor
beneath the fireplace and the chase bottom.
Chase insulation in a cold climate installation
is not required for safety.
NOTE: 2" clearance to combustibles around
chimney components required.
NOTE: Blown or fill type insulation materials
must not be in contact with the fireplace or in
the enclosure frame as described in ''Enclosure''
section.
NOTE: Local codes may not require firestopping
at the ceiling levels for outside chase installa-
tions. However, it is recommended for safety
and the reduction of heat loss.
14
Roof Support
Attic Radiation
Shield
Firestop
6' 8"
(2 m)
Min.
7'
(2.1 m)
Min.
1/2" Plywood
If insulation is used, the fireplace
must not be placed directly
against it. Insulation or vapor
barriers, if used, must first be
covered with drywall panels,
plywood, particle board or other
material to assure insulation and
vapor barriers remain in place.
Do not pack or fill required air
spaces with insulation or other
material. No material is allowed
in these areas.
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
WARNING
WARNING
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)
Nailing Flanges
Four nailing flanges are provided to secure the
fireplace to the floor (see Figure 16). 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.
There are also nailing flanges on both vertical
facing sides of fireplace (not shown).
Fireplace
Side
Unbend to floor
and nail/screw
Nailing Flange
(2 places each side)
Figure 16
SEE NOTE
Solid
Continuous
Surface
Outside
Base
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