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E. Installing the Attic Insulation Shield
WARNING! Risk of Fire! You MUST install an attic
installation shield when there is any possibility of insulation
or other combustible material coming into contact with the
chimney.
•
DO NOT pack insulation between the chimney and the
attic insulation shield.
•
Failure to keep insulation and other materials away
from the chimney pipe could cause a fire.
•
DO NOT offset chimney inside insulation shield.
•
Combustible material may come into contact with
the attic insulation shield as long as the required
clearances are maintained to the chimney pipe.
Installation of a ceiling firestop is required:
Note: In Canada a CAS8 must be installed. See instructions
provided with kit.
•
Refer to Figures 8.6, 8.7, and 8.8.
•
If the attic shield is pre-rolled continue. If it is a flat part,
try to roll it up to aid in wrapping it around the chimney.
•
Pre-bend all the tabs in at the top to 45 degrees.
•
Wrap the shield (around the chimney if already
installed) until you have an overlap and the three holes
on each side match up (large holes on top).
•
Insert three screws into the matching holes to form a
tube starting at the bottom.
•
Bend the tabs on the bottom of the tube inward to 90
degrees to maintain chimney air space.
•
Rest the insulation shield on the ceiling firestop below.
•
Tape off any openings around the bottom.
If you want to make a custom shield or barrier, follow these
guidelines:
•
Metal is preferred, although any material stiff
enough to hold back the insulation can be used.
WARNING! Risk of Fire! Use of cardboard or other
materials that can deflect under humidity or other
environmental conditions is not recommended.
•
The shield or barrier must be tall enough to extend
above the insulation and prevent blown-in insulation
from spilling into the cavity and accommodate the
amount of insulation as required by the National
Building Code.
•
Maintain specified air spaces around chimney.
•
Check instructions and local codes for further details.
Double-check the Chimney Assembly
Continue assembling the chimney sections up through
the ceiling firestops as needed. While doing so, be aware
of the height and unsupported chimney length limitations
given under Section E.
Check each section by pulling up slightly from the top to
ensure proper engagement before installing the succeeding
sections. If they have been connected correctly, they will
not disengage when tested.
Outdoor Lifestyles by Hearth & Home Technologies • 4072-203 Rev E • 11/20
Figure 8.6
Prepare Attic Insulation Shield
2 in. (51 mm)
air space
5 Tabs bent
Insulation
10-1/2 in.
(267 mm)
Figure 8.7
Install Attic Insulation Shield (firestop above ceiling)
2 in. (51 mm)
air space
5 Tabs bent
Insulation
10-1/2 in.
(267 mm)
Figure 8.8
Install Attic Insulation Shield (firestop below ceiling)
Pre-bend the tabs to
rest against pipe to
prevent insulation
from falling in.
Insert three
screws
(5)Tabs bent
in 90°
Tabs bent in to
rest against pipe
Pipe
Attic Insulation Shield
14-1/2 in. (368 mm)
diameter
in 90°
Ceiling Firestop
Pipe
Insulation
Seal with tape
Tabs bent in to
rest against pipe
Pipe
Attic Insulation Shield
14-1/2 in. (368 mm)
diameter
in 90°
Insulation
Ceiling Firestop
Pipe
Seal with tape
27
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