Minimum Thickness of Metal

NYC Building Code § BC 2212

in effect

Section BC 2212: Minimum Thickness of Metal 2212.1 General. All steel of Chapter 22 shall conform to the minimum thickness of metal in accordance with Section 2212.2. 2212.2 Exterior members. All exterior structural steel members exposed to weather shall have a minimum thickness of metal of 0.23 inches (5.8 mm). Exceptions: 1. When an approved type of atmospheric corrosion- resistant steel is used. 2. Exposed surfaces are zinc coated with a minimum weight of coating of approximately 0.6 ounces per square foot (0.00156 kg/m2) of exposed surface and covered with a protective coating as required by Section 2203.2. 3. Exposed surfaces are protected by other means approved by the commissioner. 4. Temporary construction installations that will be in place for a period of 1 year or less, provided that all surfaces which are exposed to the weather shall have a protective coating as required by Section 2203.2. 5. Joists or purlins that are exposed to the weather but which do not support more than 200 square feet (19 m2) of floor or roof area, and which have a protective coating as required by Section 2203.2.

Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-181470Fetched: 10/24/2026