Figure 12A
INSULATED CHASE
CONSTRUCTION
Adjustable
Standoffs
Figure 12B
DETAIL A
Flush Installation
TOP STAND-OFF ASSEMBLY AND NAILING FLANGE POSITIONS
NOTES
:
- Top standoff assembly must be installed during installation.
- Adjustable stand-off and nailing flanges allow for 1/2” of adjustment
front to back for desired installation. See Figure 12b.
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.
NOTE: It is recommended
that the chase walls and floor
be insulated in the same man-
ner, using the same insulation, as
the rest of the building, below the attic.
7 Ft. Min.
Attic Radiation
Shield
Roof Support
Storm Collar
Flashing
Drywall or
Any Rigid
Material
2” x 4”
Fireplace
1/2” Plywood
6’ 8” Min.
Firestop
Floor,
Ceiling &
Wall
Insulate Joists
Same As Ceiling
Draft Stops
Firestop
CTDT
Termination
Note: Non-
Combustible
Chase
Flashing
Must Be
Used To
Cover
Chase
Opening
Optional
Insulation
In Outside
Walls Of
Chase
Solid
Continuous
Surface
Outside
Base
Insulation
(Thermal Barrier)
8'
Level
8’
(2.4 m)
Level
SEE NOTE
Top Standoff
Assembly
See Detail A for
Installation
Options
Side Nailing Flanges
Bend mounting
flange back-
ward as shown
Adjust standoff
And nailing flanges
To rear position
Proud Installation
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
12
