14B-6-603  Combustible material in Types I and II construction.
The provisions of Section 603 of IBC are adopted by reference with the following modifications:
1.   Revise item 1 and its subparts in Section 603.1 to read:
“1. Fire-retardant-treated wood shall be permitted in:
1.1.   Nonbearing partitions where the required fire-resistance rating is 1 hour or less.
1.2.   [Reserved.]
1.3.   Roof construction, including girders, trusses, framing and decking of one-story buildings that do not exceed the height and area limitations for Type IIB construction.”
2.   Add an exception to item 6 in Section 603.1 to read:
Exception: Combustible millwork shall not be permitted in exterior wall openings that are within 5 feet (1524 mm) horizontally and 3 feet (914 mm) vertically of an opening in an adjacent story.”
3.   Revise item 13 in Section 603.1 to read:
“13.   Combustible exterior wall coverings, exterior balconies and similar projections and bay or oriel windows in accordance with Chapter 14 and Section 705.2.”
4.   Revise item 14 in Section 603. 1 to read:
“14.   Blocking such as for handrails, millwork, cabinets and window and door frames in exterior walls or in interior walls and partitions where the required fire-resistance rating is 1 hour or less.”
5.   Revise item 19 in Section 603.1 to read:
“19.   Heavy timber as permitted by Note c to Table 601 and Sections 602.4.3 and 705.2.”
6.   Revise item 25 in Section 603.1 to read:
“25.   Materials exposed within plenums complying with the Chicago Mechanical Code and Chicago Electrical Code.”
7.   Add a new item 27 to Section 603.1 to read:
"27.   Exterior fiber-reinforced polymer as permitted by Section 2613.5."
8.   Revise Section 603.1.2 to read:
"603.1.2 Piping.
The use of combustible piping materials shall be permitted where installed in accordance with the limitations of Section 903, the Chicago Mechanical Code and the Chicago Plumbing Code."
9.   Revise Section 603.1.3 by replacing “this code” with “the Chicago Electrical Code.”
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 22)