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Where the free end of a reinforcing bar is required to have a standard hook, the hook shall be a 180-degree bend plus 4 db extension but not less than 21/2 inches, or a 90-degree bend plus 12 db extension.

Related Code Sections

R611.7.1.5 Wall Construction, Standard Hook
Where the free end of a reinforcing bar is required to have a standard hook, the hook shall be a 180-degree bend plus 4 db extension but not less ...