Dual Overlay from Warmup is a free-floating subfloor for use with carpet, vinyl and linoleum floor finishes. It can be used in combination with the Warmup Foil System underfloor heating for a professional installation.At just 7mm in depth, this subfloor is very thin, providing a stable and durable platform on which a variety of floor coverings can be laid.Nice and easy to install, it is made from engineered wood with an interactive adhesive for a base that won\'t slip.Warmup Dual Overlay helps to protect electric heating wire from damage if flooring is not laid immediately.