be enclosed in a chase structure. It is best to locate the
chase away from any overhead obstructions and meet all
clearances from such objects. The chase should be con-
structed in such a way that it is an extension of the home.
It should be well insulated between the footings and the
floor of the home to prevent heat loss. If the climate in
your area is mild, insulate the chase at least to the first
firestop. If the climate in your area is very cold, insulate
the chase to the top to keep the flue warmer, to increase
the draft, and reduce creosote buildup.
If required by local codes, make certain that the walls
have been properly insulated, vapour sealed and
sheathed with a fire rated gypsum board (see Figure 9-
10).
Remember: Check local codes concerning installation
requirements and restrictions in your area.
FIRE STOP
A fire stop must be placed where the chimney passes
through each floor level overhead. This will assist in
retarding any spread of fire and act to contain the fire
within the area below the firestop.
OFFSET CHIMNEY
• Maximum offset angle: 45°
• Maximum number of elbows: four (4), resulting in two
(2) offsets.
An elbow may be installed directly on top of the fire-
place if required.
Page 11
DELTA
10 feet min.
2 feet min.
storm collar
flashing &
radiation
shield*
12" min
insulation
chase liner of fire rated
gypsum board is recom-
mended (may be required
by local authorities)
framing guide supplied
Delta
Figure 9 : Chimney installation with chase enclosure
2 feet
min.
10 feet min.
flashing &
radiation
shield*
12” min.
2” min.
clearance
Wall
support
Radiation
shield or
firestop
Insulated
angle (30ºor
45º radiation
shield)
Delta
Figure 10: Offset chimney through a wall
*In USA: use vented flashing
In CANADA: use roof radiation
shield and regular
flashing
storm collar
*In USA: use vented flashing
In CANADA: use roof radiation
shield and regular
flashing
storm
collar
radiation
shield
offset
rise
support
3 metal
screws in
each joint
radiation shield
Figure 11 : Offset chimney installation
attic
install an offset support
or roof support after
each offset
