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6
EXTERIOR INSTALLATION (CONT'D)
Step 9. If the chimney must pass through a soffit
overhang above, cut and frame an opening
according to the Roof Opening Chart shown
in Figure 1. Important: Do not cut a truss!
If desired, a firestop can be used to enclose
the underside of the soffit. If using this part,
be sure to follow the recommended framing
requirements shown in Table 1 on page 3.
WARNING: The clearance between the chimney
and combustible material must not be less
than 2". Do not fill required air space in this
area with insulation.
Step 10. Stack a chimney length on top of the tee.
Turn it clockwise to lock it in place.
Step 11. Stack the next chimney length on the first
length. Continue until the required chimney
height is reached.
NOTE: In exterior installations, the chimney must
be stabilized at 8-foot intervals. A wall band
(AWBU) or Offset Support (URES) can be used
for this purpose.
TO CONTINUE INSTALLATION
SEE ROOF FLASHING INSTALLATION, on page 7.
Figure 18
WALL FRAMED
OPENING
WALL FRAMED
OPENING
LARGE
WALL
WALL
STUDS
THIMBLE
WALL
STUDS
FRAMED BOX
LEVEL
(SAME WOOD
FRAMED BOX
SIZE AS JOISTS)
(SAME WOOD
SIZE AS JOISTS)
WALL
STUD
Figure 17
OUTSIDE
INSIDE
INSIDE
LARGE
WALL
THIMBLE
LEVEL
1" SCREWS
1" SCREWS
WALL
STUD
STORM COLLAR
FLASHING
WALL SUPPORT
OUTSIDE
2
FRAMED OPENING DIMENSION
SMALL
WALL
THIMBLE
SMALL
WALL
THIMBLE
HOUSE INSULATION
(CORNER OF
HOUSE INSULATION
WOOD FRAME)
(CORNER OF
WOOD FRAME)
2" NAILS
2" NAILS
Figure 19
17
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