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4-00 16 30491D
BW36 SERIES WOODBURNING FIREPLACE
No one builds a better fire
24"
AS8 ATTIC
INSULATION
SHIELD
FS338
FIRESTOP
SPACER
CHIMNEY
INSULATION
10
1
/2"
14
1
/2"
Figure 14
Installing an AS8
Figure 16
Ceiling and Attic Construction
STEP 10 - Marking the Exit Point of the Roof.
Locate the point where the chimney will exit the roof
by plumbing down to the center of the chimney.
Drive a nail up through the roof to mark the center.
See Figure 16.
STEP 8 - Double-checking the Chimney Assembly.
Continue assembling the chimney sections up through
the firestop spacers as needed. While doing so, be
aware of the height and unsupported chimney length
limitations that are given on page 11 under “Chimney
Requirements”.
Check each section by pulling up slightly from the top
to ensure proper engagement before installing the
succeeding sections. If they have been connected
correctly, they will not disengage when tested.
STEP 9 - Securing the Chimney System.
When offsets and returns are joined to straight pipe
sections, they must be locked into position with the
screws provided, using the predrilled holes. To prevent
gravity from pulling the chimney sections apart, the
returns and the chimney stabilizers have straps for
securing these parts to joists or rafters.
See Figure 15.
FIRESTOP
STRAPS
OPTIONAL
ADDITIONAL
SUPPORT
JOINT
BAND
(OPTIONAL)
STEP 11 - Cutting Out the Hole in the Roof.
Measure to either side of the nail and mark the 14
1
⁄2" x
14
1
⁄2" opening required. This is measured on the hori-
zontal; actual length may be larger depending on the
pitch of the roof. Cut out and frame the opening.
See Chapter 25 of the Uniform Building Code for
Roof Framing details. Be sure to maintain a 2" mini-
mum air space between the chimney section and the
roof.
WARNING!
WHEN CHIMNEY SECTIONS EXCEED-
ING SIX FEET IN LENGTH ARE
INSTALLED BETWEEN AN OFFSET/
RETURN, STRUCTURAL SUPPORT
MUST BE PROVIDED TO REDUCE
OFF-CENTER LOADING AND PRE-
VENT CHIMNEY SECTIONS FROM
SEPARATING AT THE CHIMNEY
JOINTS.
NOTE: Be sure to provide support for the
pipe during construction and check to be
sure inadvertent loading has not dislodged
the chimney section from the fireplace or at
any chimney joint.
Figure 15 - Offset/Return with Stabilizer