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 an
•Frame the hole with framing lumber the same size as the ceiling joists.
11" (280 mm) | 11" (280mm) | |
| ||
| CHIMNEY | |
| HOLE | |
NEW | EXISTING CEILING | |
JOISTS | ||
FRAMING | ||
| ||
MEMBERS |
| |
CEILING |
| |
Figure 17. 11" x 11" 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 18. 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).
| NAILS (4 REQUIRED) |
| RAFTER |
CEILING |
|
| CEILING FIRESTOP |
Figure 19. | Attic Firestop |
19