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900574-00N/C
10
VENTING INSTALLATION
Continued
FIRESTOP SPACERS (3600FS-8DM-1)
Firestop spacers are required at each point where chimney penetrates
a floor space. Their purpose is to establish and maintain required
clearance between chimney and combustible materials. When pipe
passes through a framed opening into a living space above, firestop
must be placed onto ceiling from below as shown in Figure 10.
They also provide complete separation from one floor space to an-
other or attic space as required by most codes. When double wall
pipe passes through a framed opening into an attic space, firestop
must be placed into an attic floor as shown in Figure 11.
Figure 10 - Firestop Spacer with Living Space Above Ceiling
Figure 11 - Firestop Spacer with Attic Space Above Ceiling
PENETRATING ROOF
To maintain a 1" clearance to pipe on a roof with a pitch, a rectangular
opening must be cut.
1. Determine center point where pipe will penetrate the roof.
2. Determine center point of the roof. Pitch is the distance the roof
drops over a given span, usually 12". A 6/12 pitch means that the
roof drops 6" for each 12" measure horizontally down from roof
rafters.
3. Use roof opening chart (Figure 12, page 11) 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.
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
(38FST or FST30) is required to avoid intrusion by insulation
and recommended to negotiate a joist (see Figure 11a).
Figure 11a - Firestop Thimble
Thimble
38FST or
FST30
Firestop
