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// CODE SNIPPET

2111.6 Firebox Walls

Building Code 2018 of Illinois > 21 Masonry > 2111 Masonry Fireplaces > 2111.6 Firebox Walls
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Masonry fireboxes shall be constructed of solid masonry units, hollow masonry units grouted solid, stone or concrete. Where a lining of firebrick not less than 2 inches (51 mm) in thickness or other approved lining is provided, the minimum thickness of back and sidewalls shall each be 8 inches (203 mm) of solid masonry, including the lining. The width of joints between firebricks shall be not greater than 1/4 inch (6.4 mm). Where a lining is not provided, the total minimum thickness of back and sidewalls shall be 10 inches (254 mm) of solid masonry. Firebrick shall conform to ASTM C27 or ASTM C1261 and shall be laid with medium-duty refractory mortar conforming to ASTM C199.

2111.6.1 Steel Fireplace Units

Steel fireplace units are permitted to be installed with solid masonry to form a masonry fireplace provided that they are installed according to either the requirements of their listing or the requirements of this section. Steel fireplace units incorporating a steel firebox lining shall be constructed with steel not less than 1/4 inch (6.4 mm) in thickness, and an air-circulating chamber that is ducted to the interior of the building. The firebox lining shall be encased with solid masonry to provide a total thickness at the back and sides of not less than 8 inches (203 mm), of which not less than 4 inches (102 mm) shall be of solid masonry or concrete. Circulating air ducts employed with steel fireplace units shall be constructed of metal or masonry.

Related Code Sections


2111.6 Masonry, Firebox Walls
Masonry fireboxes shall be constructed of solid masonry units , hollow masonry units grouted solid, stone or concrete. Where a lining of firebrick ...
Building Code 2021 of Illinois > 21 Masonry > 2111 Masonry Fireplaces > 2111.6 Firebox Walls
2111.6 Masonry, Firebox Walls
Masonry fireboxes shall be constructed of solid masonry units, hollow masonry units grouted solid, stone or concrete. Where a lining of firebrick ...
Building Code 2018 of Illinois > 21 Masonry > 2111 Masonry Fireplaces > 2111.6 Firebox Walls
2111.3 Masonry, Footings and Foundations
foundation walls below fireboxes, where provided, shall be equipped with ferrous metal or masonry doors and frames constructed to remain tightly closed, except ...
Building Code 2018 of Illinois > 21 Masonry > 2111 Masonry Fireplaces > 2111.3 Footings and Foundations
2111.7 Masonry, Firebox Dimensions
The firebox of a concrete or masonry fireplace shall have a minimum depth of 20 inches (508 mm). The throat shall be not less than 8 inches (203 mm ...
Building Code 2021 of Illinois > 21 Masonry > 2111 Masonry Fireplaces > 2111.7 Firebox Dimensions
2111.7 Masonry, Firebox Dimensions
The firebox of a concrete or masonry fireplace shall have a minimum depth of 20 inches (508 mm). The throat shall be not less than 8 inches (203 mm ...
Building Code 2018 of Illinois > 21 Masonry > 2111 Masonry Fireplaces > 2111.7 Firebox Dimensions
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