21
FV42
85-03-01068
WALL THIMBLE ROUGH
FRAMING
Constructing the Fireplace Chase
A chase is a vertical box-like structure built to enclose this fireplace and its vent system. Vertical vents that
run on the outside of a building may be, but are not required to be, installed inside a chase.
Construction of the chase may vary with the type of building. These instructions are not substitutes for the
requirements of local building codes. Local building codes
must be followed.
Chases should be constructed in the manner of all outside walls of the home to prevent cold air drafting
problems. The chase should not break the outside building envelope in any manner.
Wall, ceiling, base plate, and, if applicable, cantilever floor of the chase should be insulated. Vapor and air
infiltration barriers should be installed in the chase as per regional codes for the rest of the home. In
addition, in regions where cold air infiltration may be an issue, the inside surfaces of the chase may be sheet
rocked and taped for maximum air tightness.
To further prevent drafts, the fire stops should be caulked with high-temperature caulk to seal the gaps. Gas
line holes and other openings should be caulked with high-temperature caulk or stuffed with unfaced
insulation. If the fireplace is being installed on a cement slab, a layer of plywood may be placed underneath
this fireplace to prevent conducting cold into the room.
f i r e - p a r t s . c o m
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