September 1, 2008
September 1, 2008 Heat & Glo • NorthStar EPA Fireplace • 480-1081C Page 23
F. Install the Ceiling Firestops
• Mark and cut an open ing in the ceiling for th e ceiling
restopbeingused.SeeFigure23.2.
• Frame the opening with the same size lumber used in the
ceiling joists.
• Installtherestopspacer.
Theserestop spacers are designed to provide the
minimum 2 in. (51 mm) air space required around the
chimney. In all situations,therestopspacersaretobe
nailedto theceilingjoists fromthe bottomorreplace
side, EXCEPT when the space above is an insulated
ceilingoratticspace.Inthissituation,therestopspacer
must be nailed from the top side to prevent loose insula-
tion from falling into the required 2 in. (51 mm) air space
around the chimney.
NOTE: See Figures 24.1 and 24.2 on page 24.
Note: Thec eilingrestopMUST benailedto thebottom
of th e ceiling joists EXCEPT when th e space above is
uninsulated and the attic insulation shield is not being used
(see Figure 23.2). When the attic insulation shield is used
theceilingrestop maybeaboveor belowthejoistof an
insulated ceiling.
Note: You must pr ovide suppo rt for the pipe dur ing
construction and check to be sure inadvertent loading has
notdislodgedthechimneysectionfrom thereplaceorat
any chimney joint.
• Ceilingrestopsmustbeusedatceiling/oor.
• Chaseconstructionrequires ceilingrestopsat each
oororevery10ft(3.05m)ofclearspace.
• Use same dimensional lumber as joists.
Ceilingrestopslowsspreadof reandreducescoldair
inltration.
CAUTION
ROOM ABOVE (non-insulated ceiling)
ATTIC ABOVE (insulated ceiling)
B
A
Ceilng firestop
attached to bottom
of framing
Ceiling firestop
attached to top of
framing
When attic insulation
shield not used
Note: Use same dimensional lumber for framing
ceiling firestop and joists.
2 in. (51mm)
clearance
2 in. (51mm)
clearance
Figure 23.2 Installing the Ceiling Firestop
Catalog #
A B
in. mm in. mm
FS338 14-1/2 368 14-1/2 368
FS339 14-1/2 368 18-3/8 467
FS340 14-1/2 368 23 584
Wire Ties
Wire Ties
4" Flex
Figure 23.1 Installing Flex Pipe