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G. Complete Installation
WARNING! Risk of Fire! You MUST maintain 2 in.
(51 mm) air space to insulation and other combustible ma-
terials around the chimney system. Failure to do so could
cause overheating and 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).
Figure 8.9 Ceiling/Attic Construction
H. Install Flashing
• Slip the ashing over the chimney.
• Nail the ashing to the roof. Keep gaps between ashing
plate and roof to a minimum.
NOTICE: Roong shingles must be below the ashing
plate on the lower side of a sloped roof and over the
ashing plate on the sides and top.
• Caulk the ashing plate and roof junction as well as the
vertical seam on the ashing. All nail heads must be
caulked with a roong sealant.
Heatilator • Birmingham BIR42-B • 4059-681 • 11/11
F. 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.