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Robust Detail E-FC-10 is an acoustic solution for insitu concrete floors. This system provides a minimum 5dB improvement the requirements of Approved Document Part E. When registered with Robust Details Ltd the requirement for on-site sound testing is removed and 3 Code for Sustainable Homes / BREEAM / Home Quality Mark credits are automatically awarded.

  • Exceeds Building Regulation requirements by minimum of 5dB
  • No need for sound testing if registered with Robust Details Ltd
  • Provides 3 CSH/BREEAM/HQM credits upon registration
  • System uses Isorubber Top, a hard-wearing acoustic covering to reduce noise transfer
  • Isorubber Top is only 3mm thick, minimising construction depths
  • No long term / short term deformation of acoustic layer
  • Suitable for use with Under Floor Heating
Acoustic Performance:

As a Robust Detail that provides 3 Code for Sustainable Homes Credits the E-FC-10 system must always achieve a site test values of:

Airborne Sound - not less than 50db (Dntw + Ctr)
Impact Sound - not greater than 57db(Lntw) This exceeds the Building Regulation (Approved Document Part E) requirements by 5dB in both cases.

Isorubber Top
Roll Size: 3mm x 1m x 20m
Roll Weight: 42Kg (11 Rolls per pallet)
Density: 600Kg/m3

Isobond Adhesive
Tub Size: 5L
Tub Weight: 6Kg
Coverage: Approx 20m2 (refer to installation guide for further details)

Isosonic Ceiling Strip
Roll Size: 40mm x 25m
Roll Weight: 0.8Kg (10 Rolls in a Bag)
Density: 30Kg/m3


Isorubber Top is a 3mm thick acoustic insulation that is adhered to a floor surface, absorbing impact sound at source. A durable product with a density of approximately 600Kg/m3, Isorubber Top has excellent impact energy absorption properties.

Isorubber Top is suitable for use with almost all types of soft and hard floor coverings and has been tested by SATRA and CERAM. While it is not intended for use as a permanent exposed surface, Isorubber Top can be left as a ‘selling surface’ and has been wear tested by the British Carpet Technical Centre.

A composite of sustainably sourced, granulated cork and recycled waste rubber Isorubber Top has a Global Warming Potential of Zero and an Ozone Depletion Potential of Zero. Isorubber Top provides a means of using problematic waste material to the benefit of the environment.

Isobond Adhesive is an acrylic emulsion adhesive that has been specifically tested for use with Isorubber products. A standard metal frame ceiling system is also required to the underside of the precast plank. The depth of the ceiling is dependent on the precast plank thickness (please see the Robust Details handbook for further guidance on the options available).

About System

The E-FC-10 system was the first floor system to be awarded 3 Code for Sustainable Homes Credit status. It is designed to be easy to install, helping to reduce the risk of workmanship errors. Isorubber Top provides a compatible base for almost all types of floor covering including carpets, vinyl, stone, ceramics, solid wood and laminates. It also provides substantial cost savings over more traditional floating floor systems.

The E-FC-10 system requires a minimum 175mm in-situ slab with a minimum density of 2400Kg/m3. It can be used with masonry (1350 – 1600Kg/m3 & 1850 – 2300Kg/m3) or framed external flanking wall constructions. A metal frame ceiling with a minimum void of 150mm under drawn with a layer of gypsum based board (minimum 10Kg/m2) is also required.

During the extensive site testing carried out for Robust Detail classification all 30 of the impact and airborne tests had to achieve a minimum 5dB improvement over regulation requirements to gain this status. Due to this excellent performance record any site that registers the E-FC-10 system with Robust Details is automatically awarded 3 Code for Sustainable Homes Credits.

The E-FC-10 system can also be, and is frequently, used in non Robust Detail specifications, subject to pre-completion testing.