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4-03 17 480-1081
North Star
EPA Certied Fireplace
14.Installing the Roof Flashing
If a roof ashing is to be used, install the roof ashing
appropriate to the roof pitch and install a round termination
cap following the instructions shipped with the cap.
For chase installations you can use a round termination
cap (TR344), a round telescoping termination cap (TR342)
or a square termination cap (ST375). A chase installation
must use a chase top. Chase tops are available from your
dealer. See page 19 for building a chase.
NOTE: Use only a noncombustible material to nish the
face of the replace below the level of the front standoffs.
A noncombustible material such as USG MICORE CV230
Mineral Fiber Board, or USG DUROCK Cement Board is
recommended for this purpose.
15.Completion of the Enclosure
Complete the fireplace enclosure, allowing space for
outside air ducts. Electrical wiring should not come in
contact with the replace. A minimum clearance of 1”
must be maintained between the replace sides and
back and the enclosure. See pages 9-10 for framing
details.
CLEARANCES!
A minimum 1” air clearance must be maintained at
the back and sides of the replace assembly.
Chimney sections at any level require a 2” minimum
air space clearance between the framing and
chimney section.
Figure 17B - Factory Built Hearth Extension
16.Hearth Extension
A hearth extension must be installed with all replaces to
protect the combustible oor in front of the replace from
both radiant heat and sparks.
The construction of, and materials used for a hearth
extension are shown in Figures 17A and 17B. A hearth
extension of this construction may be covered with any
noncombustible decorative material and may have a
maximum thickness as per the illustration. Seal gaps
between the hearth extension and the front of the replace
with a bead of noncombustible sealant.
NONCOMBUSTIBLE
DECORATIVE MATERIAL
(2) HX4 MICORE FACTORY
BUILT HEARTH EXTENSION
(Each HX4 = 1/2" (13mm) thick)
HEARTH METAL STRIPS
GAP (SEAL WITH NONCOMBUSTIBLE SEALANT)
UP TO BOTTOM OF FASCIA
6" (152mm)
1" (51mm)
20"
8" from each side of
fuel loading door
41"
Figure 17A-Field Construction Hearth Extensions
1. Hearth Extension & Floor Protection ush on the oor.
Combustible ooring 20” in front of and 8” to either side of the fuel opening; must be insulated with non-combustible oor
protection with a minimum thickness of 1” (“k” value = 0.43). Use Alternate Material Worksheet on page 18 to determine
the “k” value of the alternative material..
2. Fireplace is ush on the oor and Hearth Extension is raised to the bottom of the fascia:
Raised hearth must be constructed of non-combustible materials such as cement block or equivalent material Decorative
combustible ooring on the raised hearth must be 20” (508mm) in front of and 8” (203mm) to either side of the fuel opening must be
insulated with non-combustible oor protection with a minimum thickness of 1-1/2” (38mm) and (“k” value = 0.43).
3. Fireplace is recessed in the oor to the bottom of the fascia:
Combustible ooring 30” (762mm) in front of and 8” (203mm) to either side of the fuel opening; must be insulated with
non-combustible oor protection with a minimum thickness of 1” (25mm) and (“k” value = 0.43).