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NYC Building Code

§ 2113.3.1 — § 2113.3.1

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What is NYC BC § 2113.3.1?

Quick Answer

This section outlines the requirements for vertical reinforcement in chimneys based on their width. It specifies the number of continuous vertical bars needed and the proper anchoring and grouting methods to ensure thermal expansion of the flue liner. Applies to building owners constructing or renovating chimneys.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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2113.3.1 Vertical reinforcement.

BC § 2113.3.1

For chimneys up to 40 inches (1016 mm) wide, four No. 4 continuous vertical bars anchored in the foundation shall be placed in the concrete between wythes of solid masonry or within the cells of hollow unit masonry and grouted in accordance with Section 2103.3. Grout shall be prevented from bonding with the flue liner so that the flue liner is free to move with thermal expansion. For chimneys greater than 40 inches (1016 mm) wide, two additional No. 4 vertical bars shall be provided for each additional 40 inches (1016 mm) in width or fraction thereof.

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