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Grei – Underscreed Impact Sound Insulation

Grei – Underscreed Impact Sound Insulation

Grei acoustic insulation is a unique range of high performance, innovative soundproofing, suitable for high quality building applications particularly when used with underfloor heating systems. The use of special SBR fibres and EPDM rubber granules coupled with their unique distribution ensure excellent elasticity making it the ideal solution for impact noise through floors. This strong and resilient mat adapts perfectly to floor surfaces and is extremely easy to install.

Grei acoustic insulation is also manufactured using technology that ensures a low environmental impact making the product very eco-friendly. In fact Grei has a recycled EPDM/SBR rubber material content of over 88% and is certified VOC free. Impact sound reduction values of up to 30dB is possible using Isolgomma Grei under screed impact sound insulation mats.

CAM VOC Free Symbols


  • High insulation at minimum thicknesses (up to ΔLw 30dB)
  • Acoustic performance levels are constant over time
  • No acoustic degradation under compression
  • Ecofriendly – made from 88% recycled material
  • VOC free
  • Manufactured from SBR fibres and EPDM rubber granules
  • 20% superior performance than polyethylene products
  • 25% superior performance than other “high density” under screed products
  • 7mm thick
  • Grei can be used as an anti-vibration insulation layer under a floating screed
  • Durable material
  • Quick and easy installation
  • Regupol E48 equivalent

Grei is perfect for insulation in the following applications

  • Suitable for use with underfloor heating
  • Floors with floating screeds
  • High thickness screeds
  • Vibration insulation of plant rooms


Technical Information


Description Unit Value
Thickness mm 7
Superficial Weight kg/m² 2.80
Dynamic Stiffness mn/m³ 8
Impact Sound Reduction – ΔLw dB 24
Thermal Conductivity Coefficient W/m K 0.064

Acoustic Performance calculated according to EN 12354

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