Inherent benefits, ranging from ease of installation through to superior fire performance meant Rocksilk RainScreen Slab from Knauf Insulation was the ideal choice for Westfield London, the prestigious retail development in White City, west London.

Rocksilk RainScreen Slab was used within the external stone clad façade system and the stone clad stairwell and elevator areas of the £1.7 billion development, which comprises of more than 265 stores, nearly 50 restaurants and leisure facilities.

Taking the sheer size of the development and the anticipated visitor levels into account, fire safety was key and the insulation specified needed to reflect this. With rock mineral wool boasting a Euroclass A1 fire classification to BS EN ISO 13501-1, the highest classification available, the non-combustible nature of Rocksilk RainScreen Slab means it will not give off toxic smoke and will not suddenly ignite in a fire due to ‘flashover’. Similarly, acoustic performance within such a large complex is paramount. The sound absorption characteristics of rock mineral wool made it ideal for use in rainscreen systems and comply with both sound insulation and sound absorption requirements.

Rocksilk RainScreen Slab is lightweight and easy to install and contractors benefited from its superior workability. Rock mineral wool is quick and easy to cut on site and is designed to adapt to minor imperfections in a building’s substructure. This, together with Rocksilk RainScreen Slabs’ natural ability to ‘knit’ together - ensuring intimate contact at every joint, makes it almost impossible for thermal leakage to occur, thereby maximising thermal efficiency.

A Westfield spokesperson commented: “The specification of Rocksilk RainScreen Slab from Knauf Insulation has provided an array of benefits for both Westfield and our specialist installing contractor. Given the scale and complexity of the project we needed an insulation product that was fast and simple to install, yet had superior fire, acoustic and thermal qualities, which Rocksilk RainScreen Slab has demonstrated.”

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