Installation Instructions

6
ATTIC INSULATION SHIELD
An Attic Insulation Shield (AIS) must be installed where the chimney
enters an attic space. An Attic Insulation Shield is to keep insulation
from coming into contact with the chimney and will allow a depth of
insulation of 10 inches plus the depth of the ceiling joist. Where
height restrictions will not permit the use of the Attic Insulation
Shield, an enclosure from the attic joist to the roof joist will be
sufficient. All chimney enclosures must maintain the required minimum
air space clearance of 2" to the chimney. When enclosing the chimney
below the roof line, a Rafter Radiation Shield (RRS) must be installed
at the roof level and a Firestop Joist Shield (FRS) at the ceiling level.
Framed
Enclosure
Living Space
Ventilated Flashing
Decorator Ceiling Support
Stove Pipe Adaptor
Rain Cap
Storm Collar
Floor, Ceiling Joist
(Framed all 4 sides)
Ceiling Joist
(Framed all 4 sides)
Attic Insulation Shield
Attic Space
Chimney Sections
Two Story
Main Floor Installation
FIGURE 7
Roof Joist
(Framed all 4 sides)
For proper installation, the attic opening must be fully framed at 2
inches of clearance to the chimney pipe with framing material of the
same dimension as the ceiling joists and as per Framing Dimension
Table 2. The tabs on the plate of the AIS are inserted in the framed
opening around the chimney. Nail the AIS base to the framing with
at least 2 per side, using 2d (1") spiral nails or 1" x #8 wood screws.
flue pipe following the appliance manufacturer's installation instruc-
tions and appropriate building code requirements keeping in mind
that the flue pipe run should be as short and straight as practicable.
Generally, for a wood burning appliance installation, an 18" minimum
clearance to combustibles must be maintained for a single wall flue
pipe. The exception to this is a double wall stove pipe, such as
Selkirk's Model DSP which can be installed at reduced clearances of
6" to combustibles. See separate installation instructions for more
details.
Install additional chimney sections and lock together by turning
clockwise until the two sections lock together snugly. Install a
Locking Band to secure the two chimney sections. Continue adding
chimney lengths until a height of about 2ft. below the next ceiling
level is achieved.
NOTE: When a suspended ceiling is encountered a Cathedral Ceiling
Support Box is to be installed. Secure the Cathedral Ceiling Support
Box to the floor/ceiling joist framed on all 4 sides. The box must extend
a minimum of 1" into the room below the suspended ceiling. Chimney
Length is to protrude a minimum of 3" below support. Trim angles
must be installed.
A
B
C
D
“A” DIM.
“B” DIM.
“C” DIM.
“D” DIM.
“E” DIM.
E
FIGURE 6
FRAMING DIMENSION CHART
FOR ATTIC INSULATION SHIELD
DIAMETER
OF CHIMNEY
FRAMED
OPENING
Table 2
5”
11 x 11
6”
12 x 12
7”
13 x 13
8”
14 x 14
7 -1/4”
11”
10“
13“
18 -1/2”
8 -1/4”
12”
10“
14“
18 -1/2”
9 -1/4”
13”
10“
15“
18 -1/2”
10 -1/4”
14”
10“
16“
18 -1/2”
When an Attic Insulation Shield is required above the Ceiling
Support into an attic as shown in Figure 4, ensure that the base of the
shield is flush with the top of the joist framing and nail in place. The
telescoping portion of the AIS will eliminate the need to trim the
bottom when installed immediately above the ceiling support. When
fully extended, the AIS will provide joist shielding when installed in
a 2 story main floor or basement application (see Figures 7 & 8).
If insulation is blown in and adheres to the chimney pipe, it must be
brushed off to eliminate any possible contact of this material with the
chimney surface.
NOTE: To reduce cold air infiltration into the dwelling you
can install the optional Universal Shielding Insulation (JUSI)
into the Attic Insulation Shield. See separate installation
instructions packaged with the JUSI.