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NYC Building Code

§ 2308.7.7 — § 2308.7.7

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What is NYC BC § 2308.7.7?

Quick Answer

This section outlines the requirements for installing purlins to support roof loads, including maximum spans for different sizes of purlins and specifications for struts. The statute ensures structural integrity in roofing systems. Applies to building owners involved in construction or renovation of roof structures.

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

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2308.7.7 Purlins.

BC § 2308.7.7

Purlins to support roof loads are permitted to be installed to reduce the span of rafters within allowable limits and shall be supported by struts to bearing walls. The maximum span of a 2-inch by 4-inch (51 mm by 102 mm) purlin shall be 4 feet (1219 mm). The maximum span of a 2-inch by 6-inch (51 mm by 152 mm) purlin shall be 6 feet (1829 mm), but in no case shall the purlin be smaller than the supported rafter. Struts shall be not less than 2-inch by 4-inch (51 mm by 102 mm) members. The unbraced length of struts shall not exceed 8 feet (2438 mm) and the slope of the struts shall be not less than 45 degrees (0.79 rad) from the horizontal.

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