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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 following
instructions shipped with the cap.
I. Install Flashing
• Assemble chimney so it passes through the framed
opening.
• Slip the fl ashing over the chimney.
NOTICE: Roofi 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 roofi ng sealant.
Heatilator • A36C & A42C • 28396 • Rev AG • 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 14-1/2 in. x
14-1/2 in. (368 mm x 368 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.