Planning Your Chimney Pipe or Stove
Pipe Installation
The following
recommendations are intended
as a general guideline to assist
in the layout and selection
of the chimney components needed
for your installation. Always
read and follow Installation
Instructions before installing
your chimney system. Follow
local building codes and have
your chimney inspected.
Determine the (inner)
diameter of your Chimney.
This is usually the same size
as the flue collar on your appliance.
(See Figure 1). Follow manufacturer
recommendations whenever applicable.
Never use a chimney that is
smaller in diameter than the
flue size of the appliance it
is being connected to. An improperly
sized chimney results in poor
draft and excessive creosote
formation. Download our Chimney
Pipe Planning Guide.
Figure 1
Step
One Select the type
of installation by determining
where your chimney will run.
Installations
will vary. Determine if the
installation is a through-the-roof
or through-the-wall installation.
Do you have a second story,
or a cathedral ceiling? A through
the wall installation requires
additional components (Wall
Thimble, Tee w/Cap, Tee Support,
and Wall Straps). Install the
chimney pipe in the interior
of the structure whenever possible.
A cold exterior chimney will
produce less draft and will
generate more creosote. If at
all possible, avoid offsets
that restrict the natural draft.
A straight vertical installation
is more efficient. If an offset
is required to avoid rafters
or other obstructions, please
note that elbows greater than
30 degrees are not allowed in
the United States, and a maximum
of two offsets in a single installation
are permitted. At least one
elbow strap is required for
each offset.
Step Two Determine the number
of Chimney Pipe lengths required.
The chimney must extend at least
3 feet above the highest point
where it passes through the
roof, and be at least 2 foot
higher than any part of the
building within a horizontal
distance of 10 feet (Figure
2). The termination cap is installed
above this point. If the chimney
pipe extends more than 5 feet
above the roof, an extended
roof bracket must be installed
to provide stability against
wind and snow. When calculating
the installed length of your
chimney you must subtract for
each joint, (see chart below)
and include the height requirements
as described. This allows for
the overlap of tight fitting
joints.
Download our Chimney Pipe Installation
Guide now.
Brand of Pipe
Subtraction
per joint
DuraTech 5"-8"
1-1/4"
DuraTech 10"-24"
3/4"
DuraPlus
1-1/2"
SuperPro
1-1/8"
Figure 2
Minimum chimney
height, at sea level, of a straight
or vertical chimney is 10 feet
to 15 feet above the appliance
outlet. Higher elevations, or
the use of an elbow or a tee,
will require approximately 30%
to 60% more height to provide
for an adequate draft.
Step Three Measure the roof
pitch. For example
a 6/12 pitch has a vertical
rise of 6 inches over a horizontal
distance of 12 inches. Select
the appropriate flashing.
To calculate your roof pitch
use a 12 inch ruler (level)
to measure the number in inches
(A) from the end of the ruler
to the roof (Figure 3).
If (A) equals 6 inches then
your roof pitch is 6/12.
Figure 3
Step
Four Offset calculations
(for ceiling support installations
only). If an offset
is required to avoid rafters
or other obstructions, measure
the horizontal distance required
and the vertical height available
(Figure 4), refer to the offset
charts for the type of pipe
you are installing. For interior
systems, Class A pipe begins
at the support component. For
a flat ceiling, you need to
measure from the ceiling in
the room with the appliance
right up through upper floors,
eaves, and attic to the roof.
For pitched ceilings, your measurement
begins at the ceiling and should
include any attic space. Please
keep in mind that if your chimney
passes through a second story,
it must be in a framed enclosure.
Refer to Elbow Offset Charts.
Figure 4
Step Five Determine the stove
pipe lengths, adapters, and
other parts as needed.
Measure the distance from the
floor where the appliance will
sit to the chimney opening.
The chimney opening could be
in the ceiling or in the wall.
If the chimney opening is in
the wall, measure the distance
to the top of the opening and
them measure the diameter of
the hole from top to bottom.
Take the distance from the floor
to the chimney opening and subtract
the height of your appliance.
The remaining number is the
length of stovepipe you need.
Please keep in mind the clearance
to combustibles for the type
of stovepipe and appliance that
you have chosen. Single wall
stovepipe has an 18 inch clearance,
while double-wall can reduce
the clearance to combustibles
to 6 inches. (Required for Manufactured
Home installations.) When calculating
the installed length of your
stovepipe you must subtract
for each joint, (see chart below)
this allows for the overlap
of tight fitting joints. Note:
a typical 8 inch, 90 degree
elbow is approximately 8 inches
high.
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