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3.1.7.5. Rating of Supporting Construction
1) Except as permitted by Sentence (2) and by Articles 3.2.2.20. to 3.2.2.90. for mixed types of construction, all loadbearing walls, columns and arches in the storey immediately below a floor or roof assembly required to have a fire resistance rating shall have a fire-resistance rating not less than that required for the supported floor or roof assembly.
2) Loadbearing walls, columns and arches supporting a service room or service space need not conform to Sentence (1)
3) Except for noncombustible roof assemblies required by Clauses 3.2.2.50.(2)(c) and 3.2.2.58.(2)(c), if an assembly is required to be of noncombustible construction and have a fire resistance rating, it shall be supported by noncombustible construction.
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