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The thickness of fire-resistant materials required for protection of structural members shall be not less than set forth in Table 721.1(1), except as modified in this section. The figures shown shall be the net thickness of the protecting materials and shall not include any hollow space in back of the protection.

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721.1.1 Fire and Smoke Protection Features, Thickness of Protective Coverings
The thickness of fire-resistant materials required for protection of structural members shall be not less than set forth in Table 721.1(1), except ...
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