14
Vermont Castings Stratton
30004508
IGF263
MBUF
5/9/96
Attic Insulation
Shield
Nails
(4 Required)
Attic Joist
Ceiling
Base
Flanges
FP63
Fig. 21
Attic shield installation (Canadian requirement).
blown-in insulation should always be at least 1
Z\x
”
(38 mm) from the chimney pipe.
continue installing pipe to complete Run
Continue attaching pipe sections to complete the
system up to the next level. Always be sure the pipe
is firmly snap locked in place before proceeding to the
next pipe section.
chimney Supports
If chimney supports are required, they are installed
in the same manner as elbows. Nail chimney sup-
port straps to adjacent structural framing, as shown in
Figure 19. Bend straps as necessary and make sure
they are secure so they will support the weight of the
chimney. A chimney support is
Z\x
" (64 mm) long when
installed. Consider this dimension when determining
how many straight chimney sections are needed.
NoTe:
Chimney supports are generally used in long
runs in a chase installation.
additional ceilings
If you encounter additional ceilings, repeat the steps
outlined for the first ceiling installation. See the firestop
illustration in Figure 0.
penetrating the Roof
Run pipe to the roofline. Since the chimney system
must be vented to the out-of-doors, you
must
use an
approved MHSC termination.
If a chase is used, refer to the installation manual pro-
vided with the termination cap.
locate chimney centerpoint on Roof
Use the same procedure detailed to locate the center
point of the flue system.
Drive a nail up through the roof at the center point. This
will indicate the center point on the outside of the roof
surface.
cut and Frame Roof hole
The size of the roof hole varies with the type of chimney
termination to be used. Refer to installation instructions
provided with the chimney termination to correctly size
the roof hole.
There must be a 1
Z\x
” (38 mm) air space between out-
ermost portion of chimney sections and any adjacent
combustible surfaces. (Combustible surfaces include
burnable materials such as: ceiling members, joists,
flooring, combustible insulation and roof structures.)
waRNiNg: Do not pack required air spaces with
insulation or other materials.
Mark an outline of the roof hole using the nail as a cen-
terpoint.
NoTe:
Hole dimensions given in the chimney
top installation instructions are
horizontal
dimensions;
therefore, the hole size must be marked on the roof ac-
cordingly.
Cover the opening of the installed chimney so debris
cannot get into the system.
Cut and frame the hole. It is good practice to use fram-
ing lumber that is the same size as the rafters. Install
the frame securely because the chimney top and flash-
ing anchored to the frame must be able to withstand
heavy winds.
install Remainder of chimney Sections
Since you have preplanned the height of your termina-
tion according to the
Ten Foot Rule
, continue to install
pipe to the predetermined height.
Check the chimney top installation instructions for
details on how high above the roof top the chimney sec-
tions (all pipes) should extend.
install Top housing or Termination
Follow the installation instructions provided with the
chimney termination you have selected.
installing chimney in a chase
Refer to Page 5, Figure 3 for an illustration of a typical
chase installation.
caUTioN:
Use of firestop spacers and construction of
a chase may vary with type of building. These instruc-
tions are not a substitute for local building codes. You
must
check your local building codes to determine spe-
cific requirements for your city or state.
NoTe:
Other
building materials may be required in addition to MHSC
Firestop Spacers.
