Tuplex is a premium quality acoustic underlay for use under floating floors. Tuplex is a new generation underlay for hard flooring. It can be used underneath laminate floors as well as veneered and all engineered hardwood and coniferous floating floors. It is a versatile product that meets all the requirements associated with installing and using a hard floor. Tuplex is comprised of two layers of solid polyethylene with flexible polystyrene granules sandwiched between them.