REGUPOL sonus eco 5 Acoustic Underlay (formerly K225 5mm)


New product


REGUPOL sonus eco 5 Acoustic Underlay is made from recycled SBR rubber granulates and cork bound with polyurethane. The cork and rubber combo supports excellent cohesion between the polyurethane adhesive, the acoustic underlay and the timber floor. 

More details

More info

Areas of application:   


REGUPOL sonus eco 5 Acoustic Underlay is available in rolls or as modular tiles (new format). This new format facilitates fast installation and is ideal for the DIY installer. This underlay produces an effective acoustic barrier to install parquetry and timber floors directly to the surface finish.

REGUPOL sonus eco 5 is independently tested under laboratory controlled conditions and on-site testing to show it meets the Deemed-to-Satisfy Provisions of the current building regulations in accordance with the Building Code of Australia Part F5.4 Sound Insulation Ratings of Floors (Impact).


  • Offers long term performance without collapse or bottoming out.

  • Minimal creep, even under high loads.

  • PVC Free

  • Excellent cohesion qualities.

  • Available in rolls and modular tiles (new format) - supports fast installation.

  • Quick and easy to install.

  • Minimises construction heights.

  • A Good Environmental Choice Australia Certified sustainable product (GECA)

  • High quality and exact material thicknesses.

  • Made in Germany from recycled material

  • Suitable for use with under floor heating.

  • Protects expansion joints.

  • Limits sound transference.

  • Cushioning qualities make flooring comfortable underfoot.

  • Proven durability.

  • Manufactured and Certified to OHAS 18001:2007, DIN ISO 9001:2008, DIN ISO 14001:2004 Management Systems.

  • Regupol is a Natspec product partner. 

NATSPEC product partner


Regupol adhesives are formulated to maximize the performance of Regupol flooring and acoustic products. Regupol adhesives are made in Australia and are VOC compliant for green buildings, offering specifiers and installation contractors a warranted flooring system.

Data sheet
Product descriptionElastic pre-manufactured acoustic underlay made from selected SBR and cork particles, bound with polyurethane.
Roll width1.0 metres
Roll length20 metres
Modular tile size1050 x 500mm
Material thickness5mm
Specific weight2.25kgs/m2
Thermal conductivity0.12 W/mK
Tensile strength0.55 N/mm2 (DIN 53571, Specimen B)
Elongation at break22% (DIN 53571, Specimen B)
Temperature resistance-40˚C to +115˚C
Fire classificationB2 (DIN 4102)
NoticeData is based on periodical lab testing of test specimen taken from the actual manufacturing process and show the average values as measured. Slight tolerances within the common limits are possible.

Acoustic Performance


TEST: 2747 Hampton / Acoustic DynamicsL'nT,w(C1)FllC
Bare Slab 180mm concrete 80(-12)25
Regupol K225 5mm with 14mm Engineered Timber59 (0)=5951
Improvement∆L'nT,w 21FllC 26


The Unit of Measurement Explained:

L'n,W - Weighted Normalised Impact Sound Pressure Level.

C1 - Correction factor which allows spectrum adaptation for impact sound level.

Underlay Brochures - Timber

Further Technical Information

You can find further technical information, such as

tech data sheets and test reports

on the main ABS West website at:

7 Other products in the same category


QR code

Compare 0