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What is NYC BC § 2109.5?

Quick Answer

This section mandates that concrete framed buildings exceeding 35 feet in height, utilizing cavity wall construction with steel lintels, must incorporate horizontal joints in the exterior wythe. This requirement aims to mitigate masonry distress caused by the vertical shortening of the structural frame. Applies to building owners of qualifying structures.

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

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2109.5 Horizontal joints.

BC § 2109.5

All concrete framed buildings to be constructed over 35 feet (10 668 mm) in height (as measured from adjoining grade to the main roof level), whose exterior wythe are of cavity wall construction with steel lintels, shall have horizontal joints in the exterior wythe to prevent masonry distress induced by vertical shortening of the structural frame.

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