G‑Floor is waterproof vinyl flooring that resists mold and mildew, two of the culprits to flooring deterioration. As mold can grow on almost any surface if moisture is left, we strongly recommend that if moisture gets under the mat it be dried, although the product itself will not promote mold growth. Moisture coming from below or through the concrete subfloor should be addressed before the installation of any floor covering. It is recommended that the G‑Floor mat be applied to a smooth, clean and dry substrate. Please refer to the following question for additional tips on limiting moisture and molding issues.