NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
9
Step 4.
Note:
Chimney sections are con-
structed with a unique locking tab design,
which ensures an immediate, tight assembly
between sections. Plan your chimney require-
ments carefully before assembly as chimney is
difficult to disassemble after installation. If
disassembled, the tabs might become dam-
aged. Be certain tabs are properly formed to
ensure locking tabs engage properly.
The FTF8 chimney system is a two piece chim-
ney, which snap together from the fireplace
up. Start with the inner flue section with the
lanced end up, snap lock it in to the matching
collar on top of the fireplace. At all subsequent
joints, the upper flue section fits into the pre-
ceding flue section. Each piece snaps together
by means of locking tabs (9 locking tabs per
joint). Check each piece by pulling up slightly
from the top to ensure proper engagement
before installing the next section. If the flue
has been installed correctly, it will not separate
when you test it. Also, the inner flue joint
where each section is joined should be tight
and flat without gaps (
Figure 22 ).
Figure 21
Figure 22
Locking
Tabs
(Lances)
Figure 24
FireCraft chimney sections do not need to be
screwed together. Additional reinforcement is
not necessary except in certain offset condi-
tions (refer to page 13,
Figure 35 ).
Step 5.
The height of vertical chimney pipe
supported only by the fireplace must not ex-
ceed 30'. Chimney heights above 30' must be
supported by a Model FTF8-S4 stabilizer in-
stalled at 30' intervals.
Note:
The Model FTF8-S4 adds 3" net effective
height to the total chimney system.
Install the Model FTF8-S4 stabilizer by fitting
inner section down into respective section of
proceeding flue pipe and locking outer stabilizer
section into place over the outer chimney pipe.
Position for proper clearance through framed
opening and nail straps securely (under tension
in “shear”) into place on framing. Use 8d nails.
Attach successive lengths of chimney pipe
directly to stabilizer using same techniques as
described in Step 4 (
Figure 25 ).
Step 6.
Select the proper FireCraft roof flash-
ing based on pitch of roof. Use chart below for
selection:
Roof Pitch
Model
Flat to 6/12
F8F6
6/12 to 12/12
F8F12
FTF8-S4 Stabilizer
Next, slide roof flashing over extended chimney
section that previously has been installed above
the roof opening in Step 4. Slide flashing all the
way down until the flashing base rests flat on
the roof (
Figure 26 ). Again, check the vertical
position of the chimney and the 2" minimum air
space to combustibles.
FTF8 Chimney
FTF8 Flashing
Figure 26
Figure 25
Note:
Do not apply excessive pressure to any
subsequent chimney sections following the
stabilizer when installing. Ensure each subse-
quent chimney section is securely attached by
testing as noted in Step 4.
Outer pipe section installs in just the opposite
way; the lanced end goes down and each new
section goes OVER the outside of the previous
section installed (
Figure 23 ).
Figure 23
Note:
Assemble one component of chimney at
a time (inner section first, then outer section
last) before proceeding with the next complete
section.
Continue to assemble the chimney up through
framed opening. Assemble just enough to pen-
etrate the roof flashing openings (
Figure 24 ).
Maintain 1" minimum air space to insulation
and building materials and always check each
chimney joint (inner and outer) to ensure proper
engagement. Check vertical alignment of chim-
ney so that it projects from the roof in true
vertical position.
Thimble Cathedral
Ceiling
14" Min.
Outer Pipe Of
Chimney
Use Adjustable Thimble
FM8-AT2 For All Ceiling
Piches, From Flat To
3/12 Pitch.
