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Members of the primary structural frame other than columns that are required to have protection to achieve a fire-resistance rating and support more than two floors or one floor and roof, or support a load-bearing wall or a nonload-bearing wall more than two stories high, shall be provided individual encasement protection by protecting them on all sides for the full length, including connections to other structural members, with materials having the required fire-resistance rating.
Exception: Individual encasement protection on all sides shall be permitted on all exposed sides provided that the extent of protection is in accordance with the required fire-resistance rating, as determined in Section 703.

Related Code Sections

18.4.3 Earthquake-Resistant Structures, Columns
bar (c) One-half of the smallest cross-sectional dimension of the column (d) 12 in. Length ℓo shall not be less than the greatest of (e), (f ...