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34922 Rev B 20 12-01
T4800 INSTALLATION INSTRUCTIONS
G. CONSTRUCTING A CHASE
Figure 20 - Chase Constructions
Figure 21 - Chase Assembly
1. Materials
a. The chase is constructed using framing
materials much the same as the walls in your
home. A variety of materials may be used
including brick, stone, veneer brick, or standard
siding materials.
b. In constructing the chase, several factors must
be considered:
1) Maintain a 2 air space around the chimney.
2) The chase top must be constructed of
noncombustible material.
3) In cold climates, a firestop spacer should be
installed in an insulated false ceiling at the
8 level above the fireplace assembly. This
reduces heat loss through the chase.
4) In cold climates, the walls of the chase
should be insulated to the level of the false
ceiling as shown in Figure 21. This will help
reduce heat loss from the home around the
fireplace.
A chase is a vertical boxlike enclosure built around the
chimney and fireplace. A chase may be constructed for
the fireplace and chimney or for the chimney only. It is most
commonly constructed on an outside wall.
In cold climates, it is recommended that the chase floor
be insulated using batt type insulation between the floor
joists.
Three examples of chase applications are shown in
Figure 20.
1. Fireplace and chimney enclosed in an exterior
chase.
2. Chimney offset through exterior wall and
enclosed in chase.
3. Chase constructed on roof.