Base layer for the soundproofing of floating floors.

Base layer for the soundproofing of floating floors consisting in a high-weight non-woven polyester matched with a reinforced bituminous membrane realized with a special compound studied to give high usability and ease of application in all weathers.

The product is superficially covered with a polyethylene film and has a selvedge on one side and a self-adhesive band on the other side, in order to realize optimal junctions.

Key benefits

Soundproofing of floors from impact noises (floating floors)


  • Δlnv = 26 dB
  • S’t = 15 MN/m³
  • S’ = 34 MN/m³
  • Easily laid thanks to the roll equipped with a membrane that protects against the screed
  • Adhesive selvedge for perfect join between the rolls
  • Excellent carriage and storage thanks to the limited size of rolls
  • Possibility of waterproofing the room with a second layer of membrane
  • Easily applied thanks to the products high adaptability to unevenness and misalignments in the underlaying floors
  • Adaptability to obstacles, pipes and corners
  • Reversibility of edges
  • Odourless and decay-proof

Technical Properties

DIMENSIONS Dimensions Thickness weight/m² m²/pallet
Fonasoft 1×10 m 2,2 kg 230
Impact noise level Fonasoft
Under bare floor 74 dB
Under floor insulated with FONASOFT 48 dB
Improvement in sound absorption of impact noise 26 dB2
2 Estimate carried out according to the UNI TR 11175 standard
Dynamic rigidity Fonasoft
S’t 15 MN/m³
S’ 34 MN/m³B