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A moisture barrier is an essential component in flooring installation primarily designed to stop moisture from reaching the flooring. Moisture from the ground or subfloor can lead to various problems, including warping, buckling, or deterioration of the flooring materials. This barrier acts as a protective layer that prevents moisture penetration, thereby preserving the integrity and durability of the flooring.

While preventing mold growth is certainly a benefit of using a moisture barrier, its main function is to avoid moisture infiltration. The prevention of mold is a secondary effect, as controlling moisture levels minimizes the environment in which mold can thrive. Additionally, cushioning or enhancing aesthetics does not define the purpose of a moisture barrier; those functions may be served by other materials or installation strategies but are not related to managing moisture issues.