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.
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 = 31 dB
  • S’t = 15 MN/m³
  • S’ = 32 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
  • Odourless and decay-proof

Technical Properties

Dimensions 1×8 m
Thickness weight/m² >4,2 kg
m²/pallet 184
Impact noise level Fonas 31
Under bare floor 74 dB
Under floor insulated with FONAS 31 43 dB
Improvement in sound absorption of impact noise 31 dB1
¹ Test report carried out by CSL  
Dynamic rigidity Fonas 31
S’t 15 MN/m³
S’ 32 MN/m³B