Soundproofing membrane DFON 3.4 mm

Product Overview

DFON is a thin-layer and high effective sound insulation for reduction of impact noise. The membrane is applied under the concrete layer on the floor. Its sound insulating properties are guaranteed by the bitumen layer and the total thickness of the membrane is 3.4 mm. The material is waterproof and the installation is fast and easy. 

The sound insulation against impact noise is ΔLw = 26 dB.


EN ISO 140-1, EN ISO 140-3, EN ISO 140-6, EN ISO 140-8, EN 20140-2 and EN ISO 717/1/2, ISO: 9001


The installation is carried out directly on the slab under the concrete layer. The membrane must be placed with the bitumen layer upwards. Placed by overlapping the rows of at least 2 cm. It should not be fixed with nails or screws to the floor. A prerequisite for the installation is that the membrane must continue on the walls at least 10 cm. When installing the membrane and pouring the winding, the integrity of the membrane must not be impaired.

Required smear thickness 5 cm.

They can be placed under or over the heating pipes.


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Technical data

Thickness 3.4 mm
Sound insulation against impact noise 26 dB
Weight 0.130 kg/m2
Dynamic hardness 37 MN/m2 (EN 29052-1)