F. Install Firestops
For Horizontal Runs - Firestops are REQUIRED on both sides of a combustible wall through which the flue passes.
To install firestops (heat shield) for horizontal runs that pass through either interior or exterior walls:
•Cut a 1 in. x 1 in. (25 mm x 25 mm) hole through the wall.
•Position the firestops on both sides of the hole previously cut and secure the firestops with nails or screws.
•The pipe opening of the firestops MUST BE placed towards the bottom of the firestop.
•Continue the flue run through the firestop.
10 in. (254 mm) |
INTERIOR |
WALL SHIELD |
10 in. (254 mm) |
Figure 10.10 Flue Pipe & Firestop
For Vertical Runs - One firestop is REQUIRED at the hole in each ceiling through which the flue passes.
To install firestops for vertical runs that pass through ceilings:
•Position a plumb bob directly over the center of the vertical flue component.
•Mark the ceiling to establish the centerpoint of the flue.
•Drill a hole or drive a nail through this center point.
•Check the floor above for any obstructions, such as wiring or plumbing runs.
•Reposition the fireplace and flue system, if necessary, to accommodate the ceiling joists and/or obstructions.
•Cut a 9 in. x 9 in. (229 mm x 229 mm) hole through the ceiling when using SLP pipe. Use the firestop pipe open- ing as a guide.
•Frame the hole with framing lumber the same size as the ceiling joists.
| A |
|
|
| B |
|
| CHIMNEY |
|
| HOLE |
| NEW | EXISTING CEILING |
| JOISTS | |
| FRAMING | |
|
| |
| MEMBERS |
|
CEILING |
|
|
| A | B |
SLP | 9 in. (229 mm) | 9 in. (229 mm) |
Figure 10.11 Hole and 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 10.12 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.
NAILS (4 REQUIRED) |
RAFTER |
CEILING |
CEILING FIRESTOP |
Figure 10.13 Attic Firestop
Heat & Glo • | 41 |
