32
Figure 8.9 Ceiling/Attic Construction
H. Complete Installation
WARNING! Risk of Fire!
You MUST maintain 2 in.
(51 mm) air space to insulation and other combustible
materials around the chimney system. Failure to do so
could cause overheating and
fi
re.
• Keep chimney sections from separating or twisting.
• You may secure straight chimney sections at the joints
with screws no longer than 1/2 in. (13 mm).
The following steps should be skipped if using a
chase:
• Install
roof
fl
ashing appropriate to roof pitch.
• Install round termination cap and storm collar.
I. Install Flashing
• Assemble chimney so it passes through the framed
opening.
• Slip
the
fl
ashing over the chimney.
NOTICE:
Roo
fi
ng shingles must be below the
fl
ashing
plate on the lower side of a sloped roof and over the
fl
ashing plate on the sides and top.
• Nail
the
fl
ashing to the roof. Keep gaps between the
fl
ashing plate and the roof to a minimum.
• Caulk
the
fl
ashing plate and roof junction as well as the
vertical seam on the
fl
ashing. All nail heads must be
caulked with a roo
fi
ng sealant.
Heatilator • I100 • 35144 • Rev AA • 11/08
G. Cut out Hole in Roof
• Refer to Figure 8.9.
• Plumb from roof to center of chimney.
• Drive a nail up through roof to mark center of pipe.
• Measure to either side of nail and mark the 17 in. x 17
in. (432 mm x 432 mm) opening required.
• Measure opening on the horizontal; actual length may
be larger depending on roof pitch.
• Cut out and frame opening.
• Refer
to
Chapter 25
of the
Uniform Building Code
for
roof framing details.