15
Slide the Roof Support down over the chimney section until its brackets
rest on the roof or floor. Tighten the collar around the chimney with the
nuts and bolts supplied, then secure the collar by screwing the 6 supplied
metal screws through the holes in the collar and into the chimney.
Center the chimney in the joist opening (ensure that the 2" required air
space clearance are met) and nail or screw the support to the roof or
floor using the 12 x 3-1/2” spiral nails supplied or 12 x #8 x 1-1/4 wood
screws into a solid base.
Install additional chimney sections and lock together by turning clock-
wise until the two sections lock together tightly - continue in this manner
until the desired height is achieved. The use of Locking Bands on all
Chimney Lengths above the roof is highly recommended for added
safety and stability when exposed to windy conditions.
NOTE: The male end (coupler) of each chimney length must point up.
RAFTER RADIATION SHIELD (RRS)
A Rafter Radiation Shield must be installed where the chimney is
enclosed immediately below the roof line as shown in Figures 6 & 27.
An example of this is when the attic space of a house is being used as
living space (ie. bedroom, guestroom etc.). It must also be installed
when height restrictions will not allow the use of the Attic
Shield
Bracket
Screw
Rafter Radiation
Shield
FIGURE 24
Attach the support brackets to the support band with the 1/2” nuts, bolts and
lock washers. The lock washer is placed between the band and support
bracket to provide proper spacing as shown in Figure 23.
FIGURE 23
Roof Support Assembly
Nut
Lock Washer
Support Band
Carriage Bolt
Support
Bracket
FIGURE 22
Storm Collar
Rain Cap
The bottom chimney length(s) should protrude into the living space so
that proper clearances are maintained from the flue pipe connector to the
lower side of the ceiling (see Chart 3 in these instructions for more
details). Do not offset the JM/ALT chimney below the Cathedral
Ceiling Support. Lengths below the support can be painted with a high
temperature heat resistant paint to match the connector pipe. Follow the
paint manufacturer's instructions.
Install the support band on the chimney length at the desired position by
tightening the support band bolt and by screwing four stainless steel
sheet metal screws through the support band and into the outer casing.
NOTE: A minimum of 1" of the insulated chimney length must protrude
below the Cathedral Support Box for stability (see Chart 3 in these
instructions for more details). Do not over-tighten so that the band
deflects the chimney outer casing. Lower the chimney length down
through the opening in the bottom of the support so that the Support
Band makes contact with the bottom of the Support Box (see Figure
22).
NOTE:
The male end (coupler) of each chimney length must be
pointing upwards as per the arrow on the chimney label.
The Cathedral Ceiling Support will support a total of 18 ft. (5.5m), of
chimney sections. Chimney joints made below the support must be
secured with locking bands.
After framing in your opening to the dimensions specified in the Framing
Dimension Table 1 (measured in the horizontal plane), slide the Cathedral
Support box into the roof joist/rafter opening. Once the box is at the
desired level, ensure the box is level and nail the box to the framing using
four 2” spiral nails or # 8 x 1-1/2" wood screws per side. The excess
material sticking above the roof can either be trimmed off before attaching
the box to the framing or, after it is installed the corners can be cut and
the excess material folded down onto the roof deck.
Cathedral Support Box
Support Band
Cathedral Ceiling Support Installation
Chimney Section
Stove Pipe Adapter
Ventilated Flashing
ROOF SUPPORT (RS)
The Roof Support, may be used on a floor, ceiling or roof and adjusts
to any roof pitch. It may be used above an offset to support the chimney
or as a supplementary support when the chimney height exceeds that of
the primary support. It will also provide additional support for a
Cathedral Ceiling installation when more than 3 feet is above the roof.
The Roof Support will support a total height of 39 ft. (11.9m) chimney
sections. All chimney sections below the support must be secured with
locking bands.
The Roof Support is mounted directly on the roof sheathing with its feet
(support brackets) resting over rafters or a framed opening to form a
solid base. Frame a rectangular roof opening to provide a 2" minimum
air space clearance to combustible materials. The framing dimension is
measured in the horizontal plane.
Install additional chimney sections and lock together by turning clock-
wise until the two sections lock together tightly. Continue in this manner
until the required height above the roof is achieved. Chimney sections
installed below the Cathedral Ceiling Support are locked together from
below with each joint being secured by a Locking Band. A Roof Guy Kit
may be required if the chimney extends 5 ft (1.5m) or more above the roof
line. NOTE: Unlike normal inside installation, a Cathedral installation
provides only one support point for the chimney. This limited support can
allow the chimney to sway slightly or vibrate in high winds. It is advisable
to install additional lateral support if the chimney extends more than 3 feet
out of the roof.
NOTE:
To reduce cold air infiltration into the dwelling you
can install the optional Universal Shielding Insulation (JUSI)
into the Cathedral Ceiling Support. See separate installation
instructions packaged with the JUSI.
4 painted ceiling trim angles are supplied with fastening screws to finish
off the Support Box at the ceiling level. 2 pieces are trimmed off to
match the pitch of the ceiling.
