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4
INTERIOR INSTALLATION WITH CATHEDRAL CEILING (CONT'D)
SQUARE SUPPORT (CS24)
This support is similar in application
and installation as the Reduced
Clearance Support. Install it using the
instructions on page 11
(refer to Figure 13 for visual references).
Approved insulation can be used within
the extension and support surrounding
the chimney. It must be listed/compliant with
ASTM E136/ULC S114 as non-combustible, have
a melting temperature above 2000°F/1100°C, and
be water resistant with low moisture absorption.
Materials such as
rockwool qualify.
SUPPORT EXTENSION (CSE24)
(For Square Support only)
Steep pitched cathedral ceilings may
require the use of a Square Support
extension (CSE24). This piece fits
down inside the square support and can
be adjusted to increase the support's length by up
to 22"
The extension is attached to the support using
the eight metal screws provided. Be sure there is
at least a 2" overlap where the extension joins the
support.
SIDES OF HOLE MUST
BE VERTICAL
Figure 10
12
HOLE SIZE
DOWN
12 IN
B
ROOF SLOPE
ACROSS
SLOPE
REFER TO SIZING CHART AND Table 2
A
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
CS24
(12) 3" lg. SPIRAL NAILS
Figure 13
CSE24
INCHES
RAIN CAP
FLASHING
STORM COLLAR
SQUARE CATHEDRAL
SUPPORT (CS24)
SILICONE
CAULKING
ROOF JOIST
3-1/2" MIN.
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