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126653-01_E
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FIRESTOP SPACERS (FS-10)
Firestop spacers are required at each point where the chimney penetrates
a floor or ceiling joist space. Their purpose is to establish and maintain
the required clearance between the chimney and the combustible materi-
als. 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 19.
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 20.
When penetrating a floor or ceiling at an angle, use firestop spacer number
30 FS-10D (see Replacement Parts, page 15 and Accessories, page 17).
VENTING INSTALLATION
Continued
IMPORTANT NOTICE
When penetrating a ceiling into an attic, a firestop
thimble (FST10) is required to avoid intrusion by in-
sulation and recommended to negotiate a joist (see
Figure 20a).
Figure 19 - Firestop Spacer with Living Space Above Ceiling
Figure 20 - 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
Figure 17 - Chimney Supports
2" (5.1cm)
Minimum
Straps
2" (5.1cm)
Minimum
Angled Firestop
Ceiling
Support
Return
Elbow
TYPICAL OFFSET INSTALLATIONS
OFFSET
ELBOW
OFFSET
ELBOW
RETURN
ELBOW
OFFSET
ELBOW
RETURN
ELBOW
RETURN
ELBOW
RETURN
ELBOW
CEILING
SUPPORT
PIPE
V12S-8DM
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
Figure 18 - Typical Offset Installations
Figure 21- 10 Foot Rule
10' FOOT RULE
All chimney terminations must extend a minimum of 3 feet above the
highest point where it passes through the roof and must be at least 2
feet above roof with a 10 foot horizontal span (see Figure 21).
IMPORTANT:
If an exposed portion of chimney is greater than 4 feet
above the roof line, use support wires to keep chimney secure. Support
wires may be attached to outer pipe of chimney with screws, if screws
do not penetrate inner flue pipe.
Figure 20a - Firestop Thimble
Firestop Thimble FST10
