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INSTALLATION
VERTICAL
TERMINATIONS
1) Maintain the 1-1/4" (32mm)
clearances (air spaces) to
combustibles when passing
through ceilings, walls, roofs,
enclosures, attic rafter, or other
nearby combustible surfaces.
Do not pack air spaces with
insulation. Check seciotn
"Simpson Dura-vent Flueing"
for the maximum vertical rise of
the flueing system and the
maximum horizontal offset
limitations.
2) Set the gas appliance in its
desired location. Drop a
plumb bob down from the
ceiling to the position of
the appliance flue exit, and mark the location
where the flue will penetrate the ceiling. Drill
a small hole at his point. Next, drop a plumb
bob from the roof to the hole previously
drilled in the ceiling, and mark the spot where
the flue will penetrate the roof. Determine
if ceiling joists, roof rafters
other framing will obstruct the
flueing system.
You may wish
to relocate the
appliance or to
offset, as shown
in Diagram 2
to avoid cutting
load bearing
members.
Diagram 2
Note: Apply sealant "Mill-Pac" to inner pipe
and high temperature silicone seal-
ant to outer pipe on every twist-lock
joint.
3) A Firestop spacer must be installed in the
floor or ceiling of every level. To install the
Firestop spacer in a flat ceiling or wall,
cut a 10 inch square hole. Frame the hole
as shown in Diagram 3 and install the
firestop.
18
4) Assemble the desired lengths of pipe and
elbows. Ensure that all pipes and elbow
connections are in the fully twist-locked
position and sealed.
5) Cut a hole in the roof centered on the small
drilled hole placed in the roof in Step 2. The
hole should be of sufficient size to meet
the minimum requirements for clearance
to combustibles of 1-1/2" (38mm). Slip the
flashing under the shingles (shingles should
overlap half the flashing) as per Diagram
4.
Diagram 1
Diagram 4: The upper half of the flashing is
installed under the roofing material and not
nailed down until the chimney is installed. This
allows for small adjustments.
o
r
6) Continue to assemble pipe lengths.
Note: If an offset is necessary in the attic
to avoid obstructions, it is important
to support the flue pipe every 3 feet,
to avoid excessive stress on the
elbows, and possible separation.
Wall straps are available for this
purpose (Diagram 2).
Roof Pitch
flat to 7/12
over 7/12 to 8/12
over 8/12 to 9/12
over 9/12 to 10/12
over 10/12 to 11/12
over 11/12 to 12/12
over 12/12 to 14/12
over 14/12 to 16/12
over 16/12 to 18/12
over 18/12 to 20/12
over 20/12 to 21/12
Diagram 3
Diagram 5
Minimum Flue Height
Feet
Meters
2
0.61
2
0.61
2
0.61
2.5
0.76
3.25
0.99
4
1.22
5
1.52
6
1.83
7
2.13
7.5
2.29
8
2.44
Galvanized pipe is desirable above the roofline
due to its higher corrosion resistance. Continue
to add pipe sections through the flashing until
the height of the flue cap meets the minimum
height requirements specified in Diagram 5 or
local codes. Note that for steep roof pitches,
the vertical height must be increased. A poor
draft, or down drafting can result from high wind
conditions near big trees or adjoining roof lines,
in these cases, increasing the flue height may
solve the problem.
7) Ensure flue is vertical and secure the base
of the flashing to the roof with roofing rails,
slide storm collar over the pipe section and
seal with a mastic.
8) Install the vertical termination cap by twist-
locking it.
Note: Any closets or storage spaces, which
the flue passes through must be
enclosed.
Offset Chart
Regency
PG36-5 Gas Log Fireplace
®
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