The Mississippi Building Code Council accepted the 2018 versions of the IBC, IRC, IEBC, IFC, IFGC, IMC, IPC, and IECC in December 2019. The ISPSC is included into the IBC and IRC by reference. Adopting jurisdictions in Mississippi must presently use either the 2012, 2015, or 2018 versions. When a new version of any document is published, it becomes mandatory for adopting jurisdictions to review and approve (or reject) changes from the previous version before they can be used. Mississippi adopted its first building code on April 23, 1918. Since then, there have been occasional revisions to address new issues or problems that arise. The current version is the 2018 International Building Code (IBC). It was published by the International Code Council in December 2019. The IBC is the primary building code for both commercial and residential construction in Mississippi. It covers all types of buildings, including homes, apartments, offices, stores, hospitals, schools, etc. It also includes detailed requirements for the installation of heating, air-conditioning, and other energy-consuming systems. Finally, it provides guidance for the design and maintenance of roads and parking lots related to building sites. Code officials may make changes every five years to reflect new science or technology. These updates are called "revision" codes. Otherwise, they remain unchanged for ten years after publication.