S.C. Code Ann. § 5-25-670: Additional regulations as to chimneys.

No chimney shall be started or built upon a beam, wood or floor, the brickwork in all cases to start from the ground with proper foundation. In no case shall a chimney be corbeled out more than three inches from the wall and in all cases corbeling shall consist of at least five courses of brick, the corbeling to start at least three feet below the bottom of the flue.