H.R.5124: To amend the Illegal Immigration Reform and Immigrant Responsibility Act of 1996 to provide for two-layered, 14-foot reinforced fencing along the southwest border, and for other purposes.

Reinstatement of the Secure Fence Act of 2008 - Amends the Illegal Immigration Reform and Immigrant Responsibility Act of 1996 to direct the Secretary of Homeland Security to construct at least 700 miles of two-layered, 14-foot reinforced fencing along the southwest border and provide for the installation of additional physical barriers, roads, lighting, cameras, and sensors within six months of enactment of this Act.

Prohibits the inclusion of fencing in existence on January 1, 2008, as part of the fencing requirement under this Act.