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NYC Building Code

§ 1507.3.3.1 — § 1507.3.3.1

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What is NYC BC § 1507.3.3.1?

Quick Answer

This section outlines the requirements for underlayment on low-slope roofs with specific slope measurements. It specifies the application of two layers of underlayment, detailing the dimensions and fastening methods for each layer. Applies to building owners involved in roofing projects with low-slope designs.

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

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1507.3.3.1 Low-slope roofs.

BC § 1507.3.3.1

For roof slopes from 2 1/2 units vertical in 12 units horizontal (21-percent slope), up to four units vertical in 12 units horizontal (33-percent slope), underlayment shall be a minimum of two layers applied as follows: 1. Starting at the eave, a 19-inch (482.6 mm) strip of underlayment shall be applied parallel with the eave and fastened sufficiently in place.

2.Starting at the eave, 36-inch (914.4 mm) wide strips of underlayment felt shall be applied overlapping successive sheets 19 inches (482.6 mm) and fastened sufficiently in place.

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