Skim Lite underlayment is perfect for use in commercial, retail (malls and shops), healthcare, education (schools and universities), residential, hospitality and hotels and office space flooring applications. Interior or exterior use. It can be applied over concrete, plywood, OSB and Gypsum based substrates. Skim Lite offers the customer light weight properties while maintaining strong surface and is rated for castor wheel use. With installer safety in mind, this product contains no respirable crystalline silica levels that exceed the OSHA action level