Celotex Isover

Concrete Separating Floors

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The primary purpose of a separating floor is to provide acoustic separation for both airborne and impact sound between two adjacent dwellings, thereby improving the acoustic comfort of both dwellings.

The minimum permitted acoustic specifications are defined by Approved Document E (England & Wales) and Section 5 (Scotland), although it is often recommended to improve on this where possible.

One of the methods to demonstrate achieving this is to use Robust Details, alternatively an acoustician can be tasked with verifying the design of a separating floor.

One suitable insulation choice for certain concrete separating floors is a stone mineral wool slab. ISOVER RD Acoustic Floor Slab can be installed as part of Robust Detail E-FC-8 above the sub-deck to provide the level of sound reduction required according to Approved Document E (England & Wales) and Section 5 (Scotland).

Key Considerations

When using Celotex or ISOVER products, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well as local, national and other applicable standards relevant for your construction or application, including requirements in relation to fire and applicable height restrictions. In addition to the product datasheet, please refer to the following product documents:

The building detail is for illustrative purposes only. It does not constitute advice and should not be relied upon.


Insulation products
Product Name Thickness Range Sizes Lambda
ISOVER RD Acoustic Floor Slab 25mm Width 625mm, Length 1200mm NA