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424WBST Designer Woodburning Fireplaces
87D1506
The size of the hole in ceiling will vary with the angle at
which the chimney passes through ceiling.
Drive a nail up through ceiling at marked chimney cen-
ter point. Go to floor above and see where hole will be
cut. Check to see where existing ceiling joists and other
possible obstructions are located...i.e. wiring, plumbing
etc... If necessary, re-position chimney and/or fireplace
to avoid obstructions.
Cover fireplace collar opening and cut proper sized
chimney hole in chimney. The SK8 pipe allows you to
run pipe through a typical 16” on center joist without
cutting joists.
Frame the ceiling chimney hole as shown in Figure
12. It is good practice to use framing lumber that is the
same size as the ceiling joists; this is a requirement at
attic level.
The following table gives firestop spacer model num-
bers:
FP707
STR/CVR
LOCATE CENTER LINE
6/1/98
STR 33: 19" (483mm)
STR36 / CVR36: 205/O" 521mm)
STR42 / CVR42: 235/O" (597mm)
MODEL X =
2056O”
(521 mm)
Locate centerline of chimney with plumb line.
FP707
Actual Centerpoint
Chimney
Centerline
Side of STR
Plumb Line
Plumb Bob
Imaginary
Centerpoint
Typical frame for ceiling chimney hole.
FP551A
FP551A
BR/BC
9/23/98
1456O"
1456O"
Existing
Ceiling
Joists
Chimney
Hole
New Framing
Members
Ceiling chimney hole sizes necessary for installing
firestop spacer.
8" Flue SKFS2A SKFS6A
"SK" Series 14Z\₂" x 14Z\₂" 14Z\₂" x 25Z\₂"
(368 x 368 mm) (368 x 648 mm)
The of the frame the same
as the hole size selected from Figure 12 in order to
provide the required air space (1Z/₂" (38 mm) with SK8
between the outside diameter of the chimney and the
edges of the framed ceiling hole.