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NYC Building Code

§ 722.4.1.1.3 — § 722.4.1.1.3

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What is NYC BC § 722.4.1.1.3?

Quick Answer

This section defines the equivalent thickness of hollow clay masonry units when filled with specific loose-fill materials that comply with various ASTM standards. It outlines the materials acceptable for filling, including sand, gravel, and expanded aggregates. Applies to building owners using hollow clay masonry in construction.

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

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722.4.1.1.3 Units with filled cores.

BC § 722.4.1.1.3

The equivalent thickness of the hollow clay masonry units is the actual thickness of the unit where completely filled with loose-fill materials of: sand, pea gravel, crushed stone, or slag that meet ASTM C 33 requirements; pumice, scoria, expanded shale, expanded clay, expanded slate, expanded slag, expanded fly ash, or cinders in compliance with ASTM C 331; or perlite or vermiculite meeting the requirements of ASTM C 549 and ASTM C 516, respectively.

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