G. Roof Penetration
•
Refer to Figure 5.8.
•
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.
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.
• Caulk the overlap seam of any exposed pipe sections
that are located above the roof line to prevent leaks.
H. Install Chase/Chase Top
•
You MUST use a chase top in a chase installation.
Chase tops may be field constructed.
•
Include a turndown and drip edge to prevent water
from seeping into the chase.
•
Include a 2 in. (51 mm) soldered, welded or spun
collar around pipe opening to keep water out.
•
Provide a 1/8 in. (3 mm) gap around the flue pipe.
•
Slope the chase top downward away from the
opening.
WARNING! Risk of Fire! DO NOT caulk the pipe to the
chase top collar.
•
Caulk all seams to prevent leaks.
22
Heatilator • ST36D Installation Manual • 4012-061 • Rev M • 08/20
Figure 5.8
Ceiling/Attic Construction
Slope Downward
(1/4 in. per foot
minimum)
Figure 5.9
Chase Top Construction
2 in. (51 mm) Collar
on Chase Top
Turn-down
Drip Edge
Chase
.018 (26 ga) min.
Galvanized
Chase Top