Acoustic sub-flooring underlayment with vapour barrier. Made of recycled fibres and for the installation of floating laminate flooring or engineered wood. 4 mm density corrects certain sub-flooring imperfections. Recommended for installation above and below floor level on plywood or concrete. Includes an adhesive strip and a 44 mm overlap flap to connect several rolls. High thermal resistance for cold floors. Acoustic insulation: FIIC-67 / FSTC-66.