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If the interior finish material is applied to furring strips, the intervening spaces between such furring strips shall comply with one of the following:
  1. Be filled with material that is inorganic or noncombustible.
  2. Be filled with material that meets the requirements of a Class A material in accordance with Section 803.1.1 or 803.1.2.
  3. Be fireblocked at not greater than 8 feet (2438 mm) in every direction in accordance with Section 718.
Exception: Compliance with Item 1, 2 or 3 is not required where the materials used to create the concealed space are noncombustible.

Related Code Sections

719.3 Fire and Smoke Protection Features, Noncombustible Furring
In buildings of Types I and II construction, plaster shall be applied directly on concrete or masonry or on approved noncombustible plastering base ...
719.3 Fire and Smoke Protection Features, Noncombustible Furring
In buildings of Type I and II construction, plaster shall be applied directly on concrete or masonry or on approved noncombustible plastering base ...