Abstract: The invention discloses an improved seal for providing protection against water, water vapor, and other vapors from entering into and permeating through a concrete slab. The seal includes three primary functional edges extending from a common junction, a first edge positioned substantially horizontally to be moisture proof fastened to a geo-membrane liner over which a slab is to be poured, a second edge extending downwardly to the first edge to be embedded into a foundation, and a third edge extending upwardly from the first edge to be embedded into the slab. The invention applies to both monolithic and non-monolithic pours.