artnovion dBA US-Rubber Floor Underscreed Description dBA US-Rubber is an agglomerated recycled rubber resilient layer for impact noise insulation of floating screed. This underscreed is installed under concrete slabs so it prevents impact sounds generated by footsteps, for example, from propagating through the building's main structures. Specifications Material: Recycled Rubber Dimensions: 15000 x 1000 x 4 (mm) Installation: Chemical Acoustic Performance Impact Sound Reduction (ALw)* * ALw measured with US-Rubber applied directly under a 70 mm and over a 140 mm concrete slabs.