DMX 1-STEP 2.0 Underlayment is designed specifically for use in basements and/or areas where moisture or humidity is a problem. No moisture means no mold growth under your finished floors. DMX 1-STEP 2.0 is VOC free, which means that it does not off-gas harmful fumes into your living space. There is no need for OSB or Plywood. Laminate, engineered hardwood and luxury vinyl plank flooring (≥5mm) can be installed directly on top of DMX 1-STEP 2.0. The uniquely designed dimples create an air gap for moisture evaporation, and the space age foam layer increases your floor temperature by 12 ⁰F.