STEP 6. FRAMING CEILING AND ROOF OPENING
SEE FIGURE 18 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
because 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 12), except at
the attic level where it should be installed on top at the
framing members, (see figure 13). 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.
CAUTION: THE OUTER PIPE SECTION HAS A WIRE
SPACER USED TO CENTER THE INNER PIPE. THIS IS
REQUIRED TO MAINTAIN CLEARANCES TO
COMBUSTIBLE CONSTRUCTION. DO NOT REMOVE!
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 l ocks 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
extends 6” or more above the roof. The chimney may be
extended to a maximum of 12’ above the roof. A flue
support mus t be used when the system is 35’ or higher.
Figure 9
Figure 10
Figure 12
Figure 13
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
ROOF CUT TO NEAREST 1/8" ABOVE
Roof Framing Lumber
Figure 11
8
