SpringFlex is a floating wood permanent subfloor with excellent sound amplification, resiliency and absorption levels. The SpringFlex subfloor uses a pre-manufactured state-of-the-art basket weave style system. It is made with cross-laminated birch and recycled rubber for the best energy absorption. It can be combined with plywood (supplied by the customer) and any of our rollout marely floors or tongue and groove hardwood–available pre-finished in maple or oak. SpringFlex is best installed by a professional.