Building Codes and Ordinances ARC 227 - Architectural Design ...

Table 601 -footnotes
Footnote a:
The definitions of what constitute a structural frame are contained in this footnote. Only those
elements framing directly into the columns need meet the protection criteria described
Footnote b:
This footnote recognizes that roof framing at interior bearing walls in Type I construction have a
lighter fire load than does the primary structure for floors
Footnote C:
The three conditions in this footnote refer to special provisions related to fire protection and
building element protection in roof construction
C.1 permits unprotected roof construction for roofs 20’ or more above the floor below,
except in Group F, H, M and S-1 occupancies.
C.2 allows the use of heavy timbers where 1-hour or less fire-resistance rating is
required.
C.3 allows the use of fire-retardant treated wood in Type I and II construction if the
building is not over two stories in height.