13
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
clockwise 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 2 3.
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
clockwise 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 (2 short & 2 long) are supplied with
fastening screws to finish off the Support Box at the ceiling level. The
2 long pieces are trimmed off to match the pitch of the ceiling.
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