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NYC Administrative Code

§ 27-866 — Corbelling of chimneys.

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What is NYC AC § 27-866?

Quick Answer

This section regulates the corbelling of chimneys, specifying that walls less than twelve inches thick cannot be corbelled and outlines the maximum horizontal projection relative to vertical projection. The statute applies to builders and property owners involved in chimney construction and modifications.

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

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§ 27-866 Corbelling of chimneys.

AC § 27-866

Walls less than twelve inches thick shall not be corbelled. The maximum horizontal projection in any corbel shall be one inch for each two inches of vertical projection and in all cases the total projection shall not be greater than one-third of the minimum thickness of the wall to be corbelled. In no case shall the total projection be more than six inches. No masonry chimney shall be corbelled from hollow or cavity wall masonry units.

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