Install The Ceiling Firestops - Heatilator CONSTITUTION C-40 Owner's Manual

Figure 23.1 Installing Flex Pipe
F. Install the Ceiling Firestops
• Mark and cut an opening in the ceiling for the ceiling
firestop being used. See Figure 23.2.
• Frame the opening with the same size lumber used in the
ceiling joists.
• Install the firestop spacer.
These firestop spacers are designed to provide the
minimum 2 in. (51 mm) air space required around the
chimney. In all situations, the firestop spacers are to be
nailed to the ceiling joists from the bottom or fireplace
side, EXCEPT when the space above is an insulated
ceiling or attic space. In this situation, the firestop spacer
must be nailed from the top side to prevent loose insula-
tion from falling into the required 2 in. (51 mm) air space
around the chimney.
NOTE: See Figures 24.1 and 24.2 on page 24.
CAUTION
• Ceiling firestops must be used at ceiling/floor.
• Chase construction requires ceiling firestops at each
floor or every 10 ft (3.05 m) of clear space.
• Use same dimensional lumber as joists.
Ceiling firestop slows spread of fire and reduces cold air
infiltration.
Note: The ceiling firestop MUST be nailed to the bottom
of the ceiling joists EXCEPT when the space above is
uninsulated and the attic insulation shield is not being used
(see Figure 23.2). When the attic insulation shield is used
the ceiling firestop may be above or below the joist of an
insulated ceiling.
November 11, 2008
Wire Ties
4" Flex
Wire Ties
Heatilator • Constitution EPA Fireplace • 480-1091C
ROOM ABOVE (non-insulated ceiling)
B
Ceilng firestop
attached to bottom
of framing
ATTIC ABOVE (insulated ceiling)
Ceiling firestop
attached to top of
framing
2 in. (51mm)
clearance
Note:
Use same dimensional lumber for framing
ceiling firestop and joists.
Catalog # in.
FS338 14-1/2
FS339 14-1/2
FS340 14-1/2
Figure 23.2 Installing the Ceiling Firestop
Note: You must provide support for the pipe during
construction and check to be sure inadvertent loading has
not dislodged the chimney section from the fireplace or at
any chimney joint.
A
2 in. (51mm)
clearance
When attic insulation
shield not used
A B
mm in. mm
368 14-1/2 368
368 18-3/8 467
368 23 584
Page 23