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Accessibility requirements are regulated by the current edition of the adopted International Building Code and ICC/ANSI A117.
Section 501 of the International Building Code states that:
The minimum depth of footings below undisturbed ground surface shall be 32 inches.
The minimum depth of water lines below undisturbed ground surface shall be 48 inches.
Nailing inspections are only required for engineered diagram roof designs and engineered shear wall designs.