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.
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 fire.
•
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 flashing 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 flashing over the chimney.
NOTICE: Roofing shingles must be below the flashing
plate on the lower side of a sloped roof and over the
flashing plate on the sides and top.
•
Nail the flashing to the roof. Keep gaps between the
flashing plate and the roof to a minimum.
•
Caulk the flashing plate and roof junction as well as the
vertical seam on the flashing. All nail heads must be
caulked with a roofing sealant.
30
Heat & Glo • HST-48D US-CAN • 4012-040 • Rev K • 3/12
Figure 8.9
Ceiling/Attic Construction