Impactalay 12mm thick acoustic matting for concrete floors offers a cost effective and easily installed solution to combat airborne and impact noise. Suitable for concrete floors. Material: Impactalay 12mm thick Acoustic Matting is made from a single acoustic barrier mat layer with a resilient chip foam core. The acoustic foam does not harden or crumble, unlike the Class O foam normally found in these applications. Versatile: Suitable for all final finishes on concrete floors.