Secure Offset/Return; Install Ceiling Firestops - Heat & Glo NORTHSTAR-BK Installation Manual

D. Secure Offset/Return
When offsets and returns are joined to straight pipe sec-
tions, they must be locked into position with the screws
provided* (outer only), using the predrilled holes. To pre-
vent gravity from pulling the chimney sections apart, the
returns and the chimney stabilizers have hanger straps for
securing these parts to joists or rafters. See Figure 6.5.
* Use # 6 or # 8 sheet metal screw, or larger, no longer
than 1/2 in. (13 mm).
WARNING! Risk of Fire!
• Secure offsets with screws (not to exceed 1/2 in./13 mm
In length).
• Secure returns with strapping.
• Straight chimney sections may be secured with screw
(not to exceed 1/2 in./13 mm In length) at the joints.
• Keep chimney sections from separating or twisting.
Straps
Optional
Additional
Support
Figure 6.5 Secure the Chimney
E. Install Ceiling Firestops
CAUTION! Risk of Fire!
whenever the chimney penetrates a ceiling/floor.
• Chase construction requires ceiling firestops at each
floor or every 10 ft. (3.05 m) of clear space.
• The ceiling firestop slows spread of fire and reduces
cold air infiltration.
• Install a ceiling firestop whenever chimney penetrates
ceiling/floor.
• Mark and cut an opening in ceiling as shown in Figure 6.6.
• Frame the opening with the same size lumber used in
the ceiling joists.
• Nail the ceiling firestop to the bottom of the ceiling joists
when there is a room above.
• Use an attic insulation shield if the ceiling is insulated.
The ceiling firestop may then be attached above or below
the joists.
28 Heat & Glo • NORTHSTAR • 480-2360 Installation Manual • Rev H • 8/20/14
Ceiling
Firestop
Joint
Band
(Optional)
Ceiling firestops must be used
ROOM ABOVE (non-insulated ceiling)
B
Ceilng firestop
attached to bottom
of framing
ATTIC ABOVE (insulated ceiling)
Ceiling firestop
attached to top of
framing
2 in. (51mm)
clearance
Note:
Use same dimensional lumber for framing
ceiling firestop and joists.
Catalog #
FS338 14-1/2
FS339 14-1/2
FS340 14-1/2
Figure 6.6 Installing the Ceiling Firestop
WARNING! Risk of Fire! DO NOT seal area between
firestop opening and chimney pipe except where they en-
ter the attic or leave the warm air envelope of the home
(use 600° F sealant).
A
2 in. (51mm)
clearance
A B
in. mm in.
368 14-1/2
368 18-3/8
368 23
mm
368
467
584