Mapei Mapesilent Door Soundproofing is a U-shaped closed-cell expanded polyethylene self-adhesive membrane applied around openings in perimeter walls to avoid the formation of acoustic bridges. Where to use: Dry soundproofing system with a reduced thickness (13 mm), to reduce noise transmitted by footsteps between adjacent housing units. Applied on floating screeds before laying all kinds of flooring material (ceramic tiles, stone, resilient and fabric floor coverings, wooden floors, etc).