Step 4. Fireplace should be secured to side framing members using the full length nailing tabs at the top and bottom of the fireplace front face. Use 8d nails or equivalent (Figure 17 ).
8d Nail
Figure 17
Note: The nailing tabs and the area directly behind the nailing tabs are exempt from the clearances described on page 5. Maintain at least 1/2" clearance from the firebox wrapper to the framing at the closest point of contact, directly adjacent to the flange.
INSTALLING THE CHIMNEY SYSTEMStep 1. Before continuing, check the operation of the damper, as described on page 4, (refer to Figure 3 ).
Step 2. Using standard construction framing techniques, construct opening for chimney route up through the ceiling(s) and roof or through an outside chase.
Framing must maintain adequate minimum air space clearance at all times.
CAUTION: ALLOW MINIMUM 2" CHIMNEY AIR SPACE TO COMBUSTIBLE FRAMING MEMBERS THROUGHOUT VERTICAL OR OFFSET CHIMNEY INSTALLATION.
A minimum 2" air space must be reserved for all combustible materials extending for any continuous length surrounding the chimney.
Reference Figures 15 and 16 and charts Framing Dimensions for Ceiling and Roof, which specify minimum ceiling and roof dimensions.
In new construction, to determine chimney center line, use plumb line from roof or ceiling above fireplace to center of flue collar on fireplace.
8
For remodeling, plumb to center of flue collar from ceiling above, drive nail through ceiling from below to mark position, then mark and cut to passage from above ceiling (around nail) (Figure 18 ). Then plumb from ceiling or roof level directly above hole which has just been completed.
Figure 18
Step 3. Position appropriate firestop spacer at ceiling and nail temporarily with two (2) 8d nails. Use flat firestop spacer, Model
Note: If there is a room above ceiling level, firestop spacer must be installed on the bottom side of the ceiling. If an attic is above ceiling level, firestop spacer must be installed on top side of ceiling joist (Figures 19 and 20 ).
Room Above
Firestop Spacer
Figure 19
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Attic Above
Firestop Spacer
Figure 20
CHIMNEY 30° OFFSET THROUGH FLOOROR CEILINGIt may be necessary to assemble the chimney at 30° when passing through the floor or ceiling area. Use the
Attic Space |
| |
2" Min. | ||
Firestop Spacer | ||
| Air Space | |
2" Min. | ||
Stabilizer | ||
Air Space | ||
| ||
10' |
| |
Max. | 30° Firestop | |
| And Attic Above | |
Figure 21 |
| |
Room Above |
| |
2" Min. | ||
Firestop Spacer | ||
| Air Space | |
2" Min. | ||
Air Space | Stabilizer | |
10' | 30° Firestop | |
Max. | And Room Above |
Figure 22