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Heat & Glo • VRT-AUB • 2123-980 Rev. H • 5/12
Step 4.
Assemble the desired lengths of pipe and elbows neces-
sary to reach from the gas stove up through the round sup-
port 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 com-
bustibles, 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. Galva-
nized 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 obstruc-
tions, 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 7.10, 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 229 mm square hole in the ceiling, centered
on the hole drilled in Step 2. Frame the hole as shown in
Figure 7.22.
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
229 mm x 229 mm
40 mm LONG
WOOD SCREWS
CEILING JOISTS
FRAMING
Figure 7.22
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 over-
laps the top edge of the flashing as shown in Figure 7.23.
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 mini-
mum 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 7.23
Step 8.
Slip the storm collar over the pipe, and push it down to
the top of the flashing (Figure 7.24). 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 7.24