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20 Heat & Glo • VRTIKL-CE • 7031-292 Rev E • 12/07
Step 4.
Assemble the desired lengths of pipe and elbows necessary
to reach from the gas stove up through the round support
box. Ensure that all pipe and elbow connections are in their
fully twist-locked position. Assemble as instructed.
Step 5.
Cut a hole in the roof centered on the small drill hole placed in
the roof in Step 2. The hole should be of sufficient size to meet
the minimum requirements for clearance to combustibles, as
specified. Continue to assemble lengths of pipe and elbows
necessary to reach from the ceiling support box/wall thimble
up through the roof line. Galvanized pipe and elbows may
be utilized in the attic, as well as above the roofline. The
galvanized finish is desirable above the roofline, due to its
higher corrosion resistance (compared to black pipe).
NOTE:
(1) If an offset is necessary in the attic to avoid obstructions,
it is important to support the flue pipe every 91.4cm to
avoid excessive stress on the elbows, and possible
separation. Wall straps are available for this purpose,
Figure 5.10, page 15.
(2) Whenever possible, use 45° elbows, instead of 90°
elbows. The 45° elbow offers less restriction to the flow
of flue gases and intake air.
Step 3.
To install the round support box/wall thimble cover in a flat
ceiling, cut a 25.4cm square hole in the ceiling, centered
on the hole drilled in Step 2. Frame the hole as shown in
Figure 5.22.
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
4 cm LONG
WOOD SCREWS
CEILING JOISTS
FRAMING
Figure 5.22
Step 6.
Slip the flashing over the pipe section(s) protruding through
the roof. Secure the base of the flashing to the roof with
roofing nails. Ensure the roofing material overlaps the top
edge of the flashing as shown in Figure 5.23. Verify that the
chimney is the required height above the roof. See roof pitch
table, Figure 4.3.
Step 7.
Continue to assemble pipe sections until the height of the
flue (before adding the termination cap) meets the minimum
local code requirements. Note that for steep roof pitches, the
flue height must be increased. See Roof Pitch Table (Figure
4.3). In high wind conditions, nearby trees adjoining rooflines,
steep pitched roofs, and other similar factors can result in
poor draft, or down drafting. In these cases increasing the
flue height or switching to the high wind termination cap may
solve this problem.
SHINGLES OVERLAP ON
TOP EDGE OF FLASHING
CAP AND STORM COLLAR NOT SHOWN FOR CLARITY
Figure 5.23
Step 8.
Slip the storm collar over the pipe, and push it down to the
top of the flashing (Figure 5.24). Use non-hardening sealant
above and below the joint between the storm collar and the
pipe.
SECURE FLASHING WITH
NON-HARDENING SEALANT
AND ROOFING NAILS
Figure 5.24