Section 27-269. Construction classes

Table 3-3 lists construction classes
  that shall be  established  for  classifying  buildings  and  spaces  by
  construction  in  accordance  with  the  provisions of articles fifteen,
  sixteen and seventeen of this subchapter.
 
                       Table 3-3 Construction Classes
 
       Construction Group                    Class
 
       I--Noncombustible             I--A--(4-hr. protected)
                                     I--B--(3-hr. protected)
                                     I--C--(2-hr. protected)
                                     I--D--(1-hr. protected)
                                     I--E--(unprotected)
       II--Combustible               II--A--(heavy timber)
                                     II--B--(protected wood joist)
                                     II--C--(unprotected wood joist)
                                     II--D--(protected wood frame)
                                     II--E--(unprotected wood frame)