30
Recessed Partial Ledge
A ledge over the top of a fireplace that is less than 24 inches from the top of the fireplace viewing area must maintain a minimum
of
12 inches from the top of the viewing area to the bottom of the building material
.
Entire structure must be non-
combustible (framing and finish).
If ledge surface area exceeds the values shown in the chart below, the heat release must be divided between the ledge and
the chase ceiling: 25% at the ledge and 75% at the chase ceiling. This is referred to as an oversized partial ledge (see diagram
below).
Fireplace Series
Maximum Ledge
Surface Area
40-75*
(includes 31H)
A x B
≤
220 sq. in.
90-130*
A x B
≤
340 sq. in.
150-170
A x B
≤
410 sq. in.
200
A x B
≤
520 sq. in.
250
A x B
≤
580 sq. in.
*Includes Curve & Island and 31H Series Fireplaces
A = ledge depth, B= ledge width (Top View)
Oversized Partial Ledge
Oversized Partial Recessed Ledge Detail
NOTE: Chase area minimum requirements must be met throughout the entire fireplace chase. See “Chase Area
Minimum” section above for details.
