Home > Companies > Custom Audio Designs Ltd > Rubber Under-Screed Resilient Layer IsoScreed Rubber

A polyurethane-bound mixture of selected rubber fibres that is ideal for use under screeds as a resilient layer. It has a high resistance to compressive loads and remains outstandingly elastic.

It also has high acoustic benefits for impact and airborne noise and is used extensively in new build and refurbishment construction projects where Pre-Completion testing is preferred to Robust Details.


  • Significant reduction in impact noise and vibration.
  • Provides a degree of airborne and thermal insulation.
  • Will not collapse out even under heavy point loads.
  • Resistant to ageing and deformation.
  • Minimal creep even under high loads.
  • Excellent thermal conductivity.
  • Does not significantly raise the floor level.
  • Easy installation.


  • Impact reduction under screed.
  • Suitable for concrete floors.
  • Building Regulations (E&W) Approved Document E compliant.
  • Suitable with underfloor heating.

Standard product features


Approximately 700 kg/m³.

Tensile strength:

Approximately 0.7 MPa.

Tear resistance:

Approximately 75% (DIN53571).


Class B2.

Acoustic performance:

21 Rw dB under a 50 mm screed, refer to manufacturers data sheets.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-70/437 Resilient layer insulation

Product specification

An important note about specifying



Custom Audio Designs Ltd


+44 (0)1730 269572

Product reference

3 mm thickness, 20 x 1 m roll size.
6 mm thickness, 10 x 1.25 m roll size.
[A355, high load]
10 mm thickness, 6 x 1.25 m roll size.

Manufacturer details

5 Ridgeway Office Park,
Bedford Road,
Hampshire, GU32 3QF
Tel +44 (0)1730 269572
Fax +44 (0)1730 265846
NBS Plus