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Robust Detail E-FC-9 is an acoustic solution for precast plank floors. This system exceeds the requirements of Approved Document Part E and when registered with Robust Details Ltd removes the requirement for on-site sound testing.

  • Exceeds Building Regulation requirements.
  • No need for sound testing if registered with Robust Details Ltd.
  • 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 the E-FC-9 system must consistently achieve a site test mean average: Airborne Sound ≥ 50db (Dntw + Ctr) Impact Sound ≤ 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).

The E-FC-9 system 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-9 system consists of 3mm Isorubber Top fitted over a minimum 65mm sand & cement or minimum 40mm proprietary screed. The structural floor must be a minimum 150mm precast plank with a minimum mass of 300Kg/m2 per unit area. This system can be used with all masonry external flanking wall constructions (600 – 800Kg/m3, 1350 – 1600Kg/m3 & 1850 – 2300Kg/m3). A metal frame ceiling with a minimum void of 100mm, under drawn with a layer of gypsum based board (minimum 8Kg/m2) is also required.

The extensive site testing carried out for Robust Detail classification and the subsequent monitoring tests show that the E-FC-9 system can achieve 3 Code for Sustainable Homes Credits, subject to pre-completion testing. The E-FC-9 system can also be, and is frequently, used in non Robust Detail specifications, subject to pre-completion testing.