Michigan Administrative Code
Department - Licensing and Regulatory Affairs
Bureau of Construction Codes
Construction Code Commission General Rules
Construction Code
Part 5 - RESIDENTIAL CODE
Section R. 408.30521 - Elevation requirements

(1) Buildings and structures shall have the lowest floor including basements elevated so the lowest point of the floor's concrete or subfloor surface is 1 foot (305 mm) or more above the design flood elevation. The bottom of the lowest horizontal structural member of the floor system shall not be lower than the design flood elevation. Compliance with this elevation requirement shall be based upon measurement taken from the floor surface without the final floor covering and from the bottom of the lowest horizontal structural member of the floor system.

(2) Crawl space interior floor grade elevation shall comply with R408.6 of the code.

(3) Basement floors that are below grade on all sides shall be considered lowest floors and shall be elevated so that the lowest point of the floor surface is 1 foot (305 mm) or more above the design flood elevation.

Compliance with this elevation requirement shall be based upon measurement taken from the floor surface without the final floor covering.

Exception: Enclosed areas below the design flood elevation, including basements that have floors which are not below grade on all sides, shall meet the requirements of section R322.2.2 of the code.