
29
For Vertical Runs -
One ceiling firestop is
REQUIRED
at
the hole in each ceiling through which the flue passes.
To install firestops for vertical runs that pass through ceilings:
• Position a plumb bob directly over the center of the verti-
cal flue component.
• Mark the ceiling to establish the centerpoint of the flue.
• Drill a hole or drive a nail through this centerpoint.
• Check the floor above for any obstructions, such as wir-
ing or plumbing runs.
• Reposition the fireplace and flue system, if necessary, to
accommodate the ceiling joists and/or obstructions.
• Cut an 280mm x 280mm hole through the ceiling, using
the centerpoint previously marked.
• Frame the hole with framing lumber the same size as the
ceiling joists.
Figure 24. Ceiling Firestop (Ceiling Side)
If the area above the ceiling is
NOT
an attic, position and
secure the ceiling firestop on the ceiling side of the previously
cut and framed hole.
Figure 23. Hole & New Framing Members
If the area above the ceiling
IS
an attic, position and secure
the firestop on top of the previously framed hole.
NOTE: Keep insulation away from the flue pipe at least
26mm.
Figure 25. Attic Firestop
JOIST
CEILING FIRESTOP
CEILING
NAILS (4 REQUIRED)
CEILING
CEILING FIRESTOP
RAFTER
NAILS (4 REQUIRED)
CEILING
NEW
FRAMING
MEMBERS
EXISTING CEILING
JOISTS
CHIMNEY
HOLE
280 mm
280mm
NOTE: There must be NO INSULATION or other
combustibles inside the framed firestop opening.