5
30 5/8"
65"
28”
1/2”
2”
Fireplace Framing Dimensions (Combustible Floor Systems)
CLASS “A”
CHIMNEY
Figure 7 - Combustible Floor
SEE FIG. 27
AND 28
SEE FIG. 26
2” AIRSPACE
CLEARANCE TO
COMBUSTIBLES
FROM REAR
AND SIDES
ONLY NON-COMBUSTIBLE
MATERIAL WITHIN 18” OF
TOP OF OPENING.
20”
1/2” THICK
CONCRETE
BOARD
8” METAL
PLATFORM
* 2 INCH CLEARANCE TO COMBUSTIBLES BOTH
SIDES OF FIREPLACE
** If using a raised hearth or metal base plate, note that a
combustible wood header must be no closer than 2” to the
top of the dome top.
Figure 5 - Combustible Floor
2” MIN**
8-1/2”
57” I.D.
FRAMING
2” MIN*
20"
MIN
12"
MIN
12"
MIN
2" MIN
53"
*
Not provided as part of fireplace
Figure 6
- Non-Combustible Hearth Extension (by others*)
2” MIN*
12”
MIN
20”
MIN
12”
MIN
53”