Dry soundproofing system for floating screeds made from high density, closed-cell foam polyethylene sandwiched to a special protective film. TECHNICAL DATA: Thickness: 6 mm. Compressibility (reduction in thickness when under load for a period of time): < 8%. Thermal conductivity - λ: 0.04 W/mK. Water vapour diffusion resistence factor - µ: > 2000. Dynamic stiffness for calculation purposes (S’): 50 MN/m³. Calculated reductions of impact noise from footsteps (∆Lw): 23,5 dB. Calculated noise level index of impact noise from footsteps (L’n,w): 58 dB (*). Measured noise level index of impact noise from footsteps (L’n,w): 57 dB (*). (*) calculations and testing carried out on a 20+4 cm thick brick/cement floor slab, a 10 cm levelling layer over the system, a 5 cm thick cementitious screed and ceramic flooring.