2113.11.3 Concrete and Masonry Chimneys for Highheat Appliances

Concrete and masonry chimneys for high-heat appliances shall comply with Sections 2113.1 through 2113.5.

Chimneys for high-heat appliances shall be constructed with double walls of solid masonry units or of concrete, each wall to be not less than 8 inches (203 mm) thick with a minimum airspace of 2 inches (51 mm) between the walls.

The inside of the interior wall shall be lined with an approved high-duty refractory brick, not less than 4¹/₂ inches (114 mm) thick laid on the 4¹/₂-inch bed (114 mm) in an approved high-duty refractory mortar. The lining shall start at the base of the chimney and extend continuously to the top.

Concrete and masonry chimneys for high-heat appliances shall extend not less than 20 feet (6096 mm) higher than any portion of any building within 50 feet (15 240 mm).

Concrete and masonry chimneys for high-heat appliances shall have approved clearance from buildings and structures to prevent overheating combustible materials, permit inspection and maintenance operations on the chimney and prevent danger of burns to persons.