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INSTRUCTIONS WHEN OFFSET OF CHIMNEY IS
NEEDED
TO INSTALL ELBOWS
1. To achieve desired offset, you may install combinations of 12",
18", 36", and 48", lengths of double wall pipe (see Rise and Off-
sets chart and Figure 9 & 11).
2. Chimney weight above offset rests on return elbow. Straps must
be securely nailed to rafters or joists (see Figure 10 details A & B).
3. Maximum length of pipe supports (Return elbow or V12S-8DM)
is 6 feet of angled run. Maximum of two (2) 6 feet of angled run
sections per chimney system.
PENETRATING THE ROOF
To maintain a 2-inch clearance to the pipe on a roof with a pitch a
rectangular opening must be cut.
STEP 1: Determine the center point through which the pipe will
penetrate the roof.
STEP 2: Determine the pitch of the roof. Pitch is the distance the roof
drops over a given span, usually 12 inches. A 6/12 pitch means that
the roof drops 6 inches for each 12 inches measured horizontally.
STEP 3: From the center point determined in STEP 1, measure an
opening 17
1
/
inches wide (8
5
/
4
For a roof pitch between 0/12 (Flat) and 6/12 measure an opening 21
1
inches long (10
/
inches above and below the center point).
2
6/12 to 12/12 pitches: Measure 26 inches (13 above and below).
12/12 to 18/12 pitches: Measure 32
18/12 to 24/12 pitches: Measure 40 inches (20 above and below).
Figure 9
A
OFFSET
ELBOW
RETURN
ELBOW
OFFSET
ELBOW
Figure 11 TYPICAL OFFSET INSTALLATION
inches to each side of the center point).
8
1
1
/
inches (16
/
above and below).
2
4
B
RETURN
ELBOW
6' MAX
OFFSET
ELBOW
6' MAX
OFFSET
ELBOW
A
RISE AND OFFSETS
A
B
48 36 18 12
3
3
4
/
16
/
8
8
3
1
9
/
25
/
4
2
12
3
/
30
3
/
4
4
3
15
34
/
4
18
40
21
1
/
46
1
/
1
4
4
23
3
/
49
1
/
4
4
3
3
27
/
56
/
1
4
4
3
30
60
/
1
4
33
66
1
36
71
1
1
38
/
75
2
4
NOTE: ANY OFFSET
GREATER THAN 6 FEET YOU
MUST USE A V12S-8DM.
CEILING
SUPPORT
PIPE
V12S-8DM
DETAIL B
RETURN
DETAIL A
Figure 10
RETURN
ELBOW
6' MAX
RETURN
ELBOW
6' MAX
OFFSET
ELBOW
B
4
A
B
48
36 18 12 12S
1
1
41
/
80
/
1
4
4
3
1
45
86
/
2
4
1
46
3
/
89
1
/
1
4
2
2
51
97
1
1
1
1
1 53
/
101
2
4
56
1
/
106
1
/
2
4
4
1
2 59
1
/
111
1
/
1
1
4
2
3
1
61
/
115
/
2
4
2
3
3
1
64
/
120
/
2
4
4
1 68
1
/
127
1
2
4
1
70
130
2
1
1
74
/
137
/
1
2
4
2
76
3
/
141
1
/
1
2
4
2
79
3
/
146
3
/
4
4
4
2"
MINIMUM
ANGLE
FIRESTOP
ELBOW
INSTALL SUPPORT 12S-8DM
CEILING
SUPPORT
PIPE
V12S-8DM
6' MAX
6' MAX
C
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SEE
DETAIL A
SEE
DETAIL B
RETURN
ELBOW
55504
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