Chapter 5 of the Oklahoma adopted IEBC® 2018 is adopted with the following modification: Section 503.1 General. This section has been modified to address errata published by the ICC®. The modification adds language to the third exception to clarify existing and new escalators are permitted to have a clear width of less than 32 inches. This section has been modified to read: 503.1 General. Except as provided by Section 302.4, 302.5 or this section, alterations to any building or structure shall comply with the requirements of the International Building Code® for new construction. Alterations shall be such that the existing building or structure is not less complying with the provisions of the International Building Code® than the existing building or the structure was prior to the alteration. Exceptions:

1. (1) An existing stairway shall not be required to comply with the requirements of Section 1011 of the International Building Code® where the existing space and construction does not allow a reduction in pitch or slope.
2. (2) Handrails otherwise required to comply with Section 1011.11 of the International Building Code® shall not be required to comply with the requirements of Section 1014.6 of the International Building Code regarding full extension of the handrails where such extensions would be hazardous because of plan configuration.
3. (3) Where provided in below-grade transportation stations, existing and new escalators shall be permitted to have a clear width of less than 32 inches (815 mm).

Added at 38 Ok Reg 2687, eff 9-14-21