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D. Install Firestops
WARNING! Risk of Fire!
whenever the chimney penetrates a ceiling/floor.
• Mark and cut an opening in ceiling/floor as shown in
Figure 5.5.
•
Frame the opening.
• Nail the firestop to the bottom of the ceiling/floor joists.
•
Provide a means to maintain the required air space
between the chimney and insulation or install an attic
insulation shield.
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 #
in.
FS338
14-1/2
FS339
14-1/2
FS340
14-1/2
Figure 5.5
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).
Firestops must be used
A
2 in. (51mm)
clearance
A
B
mm
in.
mm
368
14-1/2
368
368
18-3/8
467
368
23
584
Heatilator • LM42 • Installers Manual • 4087-901 • Rev A • 04/14/16
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