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12
VENTING INSTALLATION
Continued
FIRESTOP SPACERS (1100EFS-10DM)
Firestop spacers are required at each point where the chimney penetrates
a floor space. Their purpose is to establish and maintain the required
clearance between the chimney and the combustible materials. When
the pipe passes through a framed opening into a living space above, the
firestop must be placed onto the ceiling from below as shown in Figure 15.
They also provide complete separation from one floor space to another
or attic space as required by most codes. When the double wall pipe
passes through a framed opening into an attic space, the firestop must
be placed into an attic floor as shown in Figure 16.
Figure 14 - Typical Offset Terminations
Figure 15 - Firestop Spacer with Living Space Above Ceiling
Figure 16 - Firestop Spacer with Attic Space Above Ceiling
Existing
Ceiling
Frame
Firestop
Spacer
Screws or
Staples (Min.
of 8)
Firestop
Spacer
Screws or Staples
(Min. of 8)
Existing
Ceiling
Frame
IMPORTANT NOTICE
When penetrating a ceiling into an attic, a firestop
thimble (FST10) is required to avoid intrusion by insu-
lation and recommended to negotiate a joist.
Firestop Thimble FST10
Figure 16a - Firestop Thimble
PENETRATING ROOF
To maintain a 1" clearance to the pipe on a roof with a pitch, a rect-
angular opening must be cut.
1. Determine center point through which pipe will penetrate roof.
2. Determine center point of roof. Pitch is distance the roof drops
over a given span, usually 12". A 6/12 pitch means that roof drops
6" for each 12" measured horizontally down from roof rafters.
3. Use roof opening chart (Figure 17, page 13) to determine correct
opening length and flashing required.
4. Remove shingles around opening measured. Cut out this section.
5. Add next sections of pipe until end penetrates roof line. Check
to see that proper clearances are maintained. Extend chimney by
adding sections of double wall pipe until pipe is minimum of 30"
above highest point of roof cutout. Termination and chimney must
extend a minimum of 36" above highest point where it passes
through roof.
Return
Elbow
Offset
Elbow
Return
Elbow
Offset
Elbow
6' (1.88 m)
Max.
6' (1.88 m)
Max.
6' (1.88 m)
Max.
6' (1.88 m)
Max.
6' (1.88 m)
Max.
6' (1.88 m)
Max.
Return
Elbow
Offset
Elbow
Offset
Elbow
Return
Elbow
A
B
C
Offset
Elbow
Ceiling
Support Pipe
12S-12DM
Return
Elbow
