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INSTALLING YOUR
DOUBLE-WALL CHIMNEY SYSTEM
BEFORE YOU BEGIN INSTALLING YOUR DOUBLE
FIRESTOP
SPACERS
WALL CHIMNEY SYSTEM DETERMINE HOW
MUCH
PtPE
AND ACCESSORIES YOU WILL NEED. SEE
firestop spacers are required at each point where the
PAGE
6
FOR
EXAMPLES O f CHIMNEY AND TERMI-
chimney penetrates a floor or ceiling
joist
space. Their
NATION DESIGNS.
purpose is twofold: they eslablish
and
maintain the
required clearance betwekn the
chimney and combus-
tible materials, and they provide complete separation
from one floor
space to another floor or attic space, as
Each double-wall chimney section consists of an outer
required by most codes. When penetrating
a floor
or
pipe, flue pipe and single-piece wire spacer. The pipe
ceiling at an angle, either the 15' or 30' firestop must be
sections are not unitized and must be assembled inde-
used.
(See
Figure 22).
pendently as the chimney is installed. (Figure
21).
FIGURE 21
INNER PIPE
+ z s Z (
RESTOP
SPACER
If pipe passes through a framed opening between floors,
install
a
firestop spacer
to the
bottom
of the joists
(Figure 22). When pipe passes into the attic space,
install the firestop
spacer
on the
top
of the joists (Figure
23) and secure with sheet metal screws or nails.
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