See this chapter of the IBC except as provided below. Section 603 – Combustible Material in Types I and II Construction. See this section of the IBC except as provided below. Section 603.1 - Allowable materials. Add the following exceptions to subsection 2: Exception 28. Stairways within individual dwelling units and stairways serving a single tenant space are permitted to be of fire-retardant wood or heavy-timber construction. In other than Group R occupancies, such stairways shall not serve as a required means of egress. Exception 29. Stairways complying with section 510.2, item 4 permitted to be constructed of wood above the horizontal assembly are also permitted to be constructed of wood below the horizontal assembly.

[14.7.2.14 NMAC - Rp, 14.7.2.14 NMAC, 7/14/2023]