STEP 6. FRAMING CEILING AND ROOF OPENING
SEE FIGURE 17 FOR INSTRUCTIONS IF THE FLUE-PIPE
WILL BE OFFSET BELOW THE FIRST CEILING LEVEL.
If you are not using elbows in this installation frame, the
ceiling and roof openings are directly above one another in
the locations you chose in the Planning Ahead section of
this manual. The flue should go straight up to the chimney
termination. Firestops must be used at each ceiling level. A
firestop is not required at the roof line. The roof framing
must be 2 x 6's or 2 x 4's and must be securely nailed be-
cause the chimney termination and flashing are anchored to
this construction and must withstand heavy loads. The
opening in the ceiling should be square. Use the nail you
previously put in the ceiling as the center of the square. See
below for framing alternative detail. Repeat this procedure
to cut and frame an opening in each ceiling level.
STEP 7. INSTALLING FIRESTOP SPACER
Install a firestop at each ceiling level. The angles on the
firestop are to maintain clearances. Nail the firestop to the
joist and headers around the ceiling opening. No firestop is
to be used at the roof level. The firestop should be installed
from the underside of the ceiling, (see figure 11), except at
the attic level where it should be installed on top at the fram-
ing members, (see figure 12). A MINIMUM OF 1" AIR
SPACE CLEARANCE MUST BE MAINTAINED FROM THE
CHIMNEY PIPE TO ALL COMBUSTIBLES.
When the chimney penetrates the ceiling at a 90° angle, use
firestop spacer 8204F-1, 14 1/2" x 14 1/2" framed opening.
When the chimney penetrates the ceiling at a 30° angle, use
firestop spacer 8230F-1, 14 1/2" x 22" framed opening.
INSTALLING THE CHIMNEY
Double Wall Chimney pipe has two sections: the inner and
the outer sections. It is very important that both sections be
installed for each length of chimney used in the system.
STEP 8.
Insert the inner (8") pipe with the male end pointing DOWN
into the inner collar. The inner flue section fits inside the
inner collar. Push the pipe until it bottoms and the snap
locks engage. Check each joint to ensure that the sections
are securely locked together.
STEP 9.
Slip the outer (12") pipe with the male end UP over the other
pipe and over the outer collar. The outer flue section fits on
the outside of the outer flue collar. Push the pipe until it
bottoms and the snap locks engage. Screws may be used
only in the outer pipe for additional support if desired.
STEP 10.
Continue this process of adding chimney pipe sections on
top of each other until the pipe penetrates the roof opening
enough to allow you to install the flashing and storm collar.
Chimney sections must be supported by either guy wires or
3/4" conduit flattened on the ends when the chimney ex-
tends 6' or more above the roof. The chimney may be ex-
tended to a maximum of 12' above the roof. A flue support
must be used when the system is 35' or higher.
Figure 8
Figure 9
Figure 11
Figure 12
ROOF CUT TO NEAREST 1/8" ABOVE
Roof Framing Lumber
Pitch
2 x 4
2 x 6
2 x 8
2 x 10
2 x 12
0/12
14 x 14
14 x 14
14 x 14
14 x 14
14 x 14
1/12
12 x 14 1/2
14 x 14 5/8
14 x 14 3/4
14 x 14 7/8
14 x 15 1/8
2/12
14 x 15
14 x 15 1/4
14 x 15 1/2
14 x 15 3/4
14 x 16 1/4
3/12
14 x 15 1/2
14 x 16
14 x 16 1/4
14 x 16 3/4
14 x 17 1/2
4/12
14 x 16 1/4
14 x 16 7/8
14 x 17 1/4
14 x 17 7/8
14 x 18 3/4
5/12
14 x 17
14 x 17 1/4
14 x 17 5/8
14 x 18 1/8
14 x 19 1/4
6/12
14 x 17 7/8
14 x 18 7/8
14 x 19 3/8
14 x 20 3/8
14 x 21 3/4
7/12
14 x 18 3/4
14 x 19 5/8
14 x 20 1/2
14 x 21 5/8
14 x 23 1/4
8/12
14 x 19 3/4
14 x 21
14 x 21 3/4
14 x 23
14 x 24 7/8
9/12
14 x 20 3/4
14 x 22 1/4
14 x 23
14 x 24 1/2
14 x 26 1/2
10/12
14 x 21 3/4
14 x 23 1/2
14 x 24 3/8
14 x 26
14 x 28 1/4
11/12
14 x 23
14 x 24 3/4
14 x 25 3/4
14 x 27 1/2
14 x 30
12/12
14 x 24 1/8
14 x 26 1/8
14 x 27 1/8
14 x 28 1/8
14 x 31 7/8
Figure 10
