Firestop spacers are not available for, nor are they required on vertical walls.
DO NOT put any sealant around the area where the outer pipe slides through the firestop spacer. If you seal this area, it may cause a fire hazard.
Canadian Requirements
for Insulation Shield
In Canada, an attic insulation shield is required to prevent attic insulation from contacting the chimney section. NOTE: If the attic insulation shield is used, the firestop is not required in the attic installation. Fram- ing dimensions for the chimney hole should measure 17¹⁄₂” x 17¹⁄₂” (445 x 445 mm). An attic shield MUST be installed on top of attic joists (above the floor level). (Fig. 17)
M400BFC Balanced Flue
A chimney support is 2¹⁄₂" (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 same steps required for first ceiling installation. See firestop illus- tration in Page 11, Figure 16.
Penetrating the Roof
Run pipe to roofline. Since chimney system must be vented to the
If a chase is used, refer to the installation manual pro- vided with the termination cap.
Attic Insula- tion Shield
Ceiling
Nails
(4 required)
Attic Joist
Base Flanges
FP263
Locate Chimney Centerpoint On Roof
Use same procedure detailed in locating center point of the flue system.
Drive a nail up through roof at the center point. This will determine center point on outside of the roof.
Cut and Frame Roof Hole
Size of roof hole varies with the type of chimney termination installed. Refer to installation instructions provided with MHSC chimney termination to find correct size of roof hole.
There must be a 1¹⁄₂” (38 mm) air space between out- ermost portion of chimney sections and any adjacent
Fig. 17 Attic shield installation (Canadian requirement).
NOTE: In the U.S., it is a good idea, although not al- ways required, to install an attic insulation shield where
Install the attic insulation shield with the flanges on its base extending down into the framing hole. Nail each corner of attic insulation shield to the framing members of the ceiling hole using 8d nails. Attic shields are not required at the roof.
Continue Installing Pipe to Complete Run
Continue attaching pipe sections to complete system to next level always being careful that the pipe is firmly
Chimney Supports
If chimney supports are required, they are installed the same as elbows. Nail chimney support straps to ad- jacent structural framing, as shown on Page 8, Figure
9.Bend straps as necessary and make sure they are secure so they will support the weight of the chimney.
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 around the center of the point nail. Note: Hole dimensions given in the chim- ney top installation instructions are horizontal dimen- sions; therefore, the hole size must be marked on the roof accordingly.
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 already preplanned the height of your termination according to the Ten Foot Rule, continue to install pipe to the predetermined height.
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