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8
Majestic Fireplaces
®
ODSR Series "A"
20006811
Insulating Fireplace Enclosure
for Cold Climates
If you live in a cold climate, it is not required but
highly recommended that you insulate fireplace
enclosure to eliminate cold air penetration as much
as possible.
Insulate base of fireplace with a noncombustible
insulation rated for a minimum of 300°F. Insulating
is very important for outside wall installations over
a concrete slab. If fireplace is installed on a platform,
insulation should be placed on top of the platform
before fireplace is set. (Fig. 9)
When a fireplace is installed in a chase or on an
outside wall, enclosure should be treated like any
outside wall in a home. Insulation should be installed
on the inside wall as well as the outside wall(s). In
a chase, it is also a good idea to install a firestop at
the first ceiling level above the fireplace and enclose
the chase with sheeting material. Insulation may
then be installed above sheeting material to assure
the space around the fireplace is totally protected.
(Fig. 3)
When installing the chimney, DO NOT caulk be-
tween outer pipe and firestop. It is vital that some air
be allowed to flow through this very thin gap.
CAUTION: WHEN INSTALLING A FIREPLACE IN
AN INSULATED ENCLOSURE, BE SURE ALL RE
-
QUIRED AIR SPACES ARE MAINTAINED. (Page
12, Fig. 19)
Installation
Chimney Supports
The chimney system is supported by the fireplace for
vertical chimney heights less than 30' (9 m) above the
hearth. Chimney supports are required if the vertical
height exceeds 30' (9 m) with SK8 chimneys or 20' (6 m)
with 3-wall chimneys. Locate
chimney supports at ceil-
ing holes or other structural framing at 30' (9 m) (SK8)
or 20' (6 m) (3-wall) heights. Spacing between chimney
supports must not exceed 30' (9 m) (SK8) or 20' (6 m)
(3-wall). Use Chimney Support Model SKCS8. (NOTE:
The SKCS8 can not be mounted directly to the
fireplace.) Support provided by elbow straps fulfills the
support requirement only if they are spaced as previ-
ously described. (A chimney support is 2¹⁄₂" (64 mm)
long when installed.)
Angled chimney runs require a support every 6' (1.8 m)
in addition to the elbow straps. Chimney supports are
used for this function. (Fig. 8)
Chase Installation
A chase is a vertical boxlike structure which encloses
the fireplace and/or chimney. Chases are typically built
on the outside of the house with fireplace opening cut
into the outer wall of a room. (Page 4, Fig. 3)
If you need help in determining fireplace location or how
the chimney system should be run, contact your Majes-
tic Fireplaces dealer for assistance.
FP284
Fig. 8 Chimney support installation
FP284
MBUF
5/25/96
Chimney Sup-
port Strap
SKCS8
FP555
Fig. 9 Insulating between platform and fireplace.
FP555
BR
11/10/97
Hard Flat
Surface
Insulation
Platform