For Vertical Runs - One ceiling firestop is REQUIRED at the hole in each ceiling through which the vent passes.
To install firestops for vertical runs that pass through ceilings:
•Position a plumb bob directly over the center of the verti- cal vent component.
•Mark the ceiling to establish the centerpoint of the vent.
•Drill a hole or drive a nail through this centerpoint.
•Check the floor above for any obstructions, such as wir- ing or plumbing runs.
•Reposition the fireplace and vent system, if necessary, to accommodate the ceiling joists and/or obstructions.
•Cut a 10” x 10” (254mm x 250mm) hole through the ceil- ing, using the centerpoint previously marked.
•Frame the hole with framing lumber the same size as the ceiling joists.
NOTE: There must be NO INSULATION or other combustibles inside the framed firestop opening.
10" (254mm) | 10" (254mm) | |
| ||
| CHIMNEY | |
| HOLE | |
NEW | EXISTING CEILING | |
JOISTS | ||
FRAMING | ||
| ||
MEMBERS |
| |
CEILING |
| |
Figure 20. Hole & New Framing Members | ||
If the area above the ceiling is NOT an attic, position and secure the ceiling firestop on the ceiling side of the previously cut and framed hole.
JOIST |
CEILING |
NAILS (4 REQUIRED) |
CEILING FIRESTOP |
Figure 21. Ceiling Firestop (Ceiling Side) |
If the area above the ceiling IS an attic, position and secure the firestop on top of the previously framed hole.
NOTE: Keep insulation away from the vent pipe at least 1 inch (25mm).
While it is not mandatory, it is strongly recommended that an attic insulation shield be used whenever insulation can come in contact with the vent pipe. Follow the local building codes.
| NAILS (4 REQUIRED) |
| RAFTER |
CEILING |
|
| CEILING FIRESTOP |
Figure 22. | Attic Firestop |
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