The bottom board is a 15 mm soft board with a vvp paper layer with an interactive contact adhesive that when removed bonds to the top board. The top board is a 10mm cement-bonded wood fiber board with an interactive contact adhesive that attaches to the bottom board. For optimum results use Cera Silence DPM Poly sheets and perimeter side strips.
Cera Silence is a sound reducing underlay systems that has been specially designed for ceramic tile and natural stone floors. Cera Silence is a completly free floating underlayment systems that is comprised of 2 parts.