Code: 12019

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Rocksilk RainScreen Slab

Product Description

Description

Rocksilk RainScreen Slab is a water repellent rock mineral wool slab, providing thermal insulation of rainscreen cladding, with inherent fire resistant properties.

Standards

Rocksilk RainScreen Slab is non-combustible inorganic rock wool, defined as mineral wool in BS 3533 and is manufactured in accordance with BSI Quality Assurance Standard BS EN ISO 9001: 2000.

Thermal Conductivity

Rocksilk RainScreen Slab has a thermal conductivity of 0.035 W/mK.

The U-value of a proprietary rainscreen cladding system is dependent on the degree of thermal bridging in the system. Typically 100mm of Rocksilk RainScreen Slab will achieve a U-value of 0.35 W/m²K, but Knauf Insulation advise consulting individual rainscreen cladding manufacturers for U-values appropriate for their system.

Fire Performance

Rocksilk RainScreen Slab is classified as Euroclass A1 to BS EN 13501-1, Class 1 surface spread of flame to BS 476: Part 7: 1997 and Class ‘O’ to the Building Regulations.

Permanence

Rocksilk RainScreen Slab is rot proof, does not sustain vermin and will not encourage the growth of fungi, mould or bacteria.

Rocksilk RainScreen Slab is odourless and non-hygroscopic.

Form and Dimensions

The Product Data table shows form and dimensions for Rocksilk RainScreen Slab.

Handling and Storage

Rocksilk RainScreen Slab is supplied in polythene packs.

Application

Rocksilk RainScreen Slab is used for the thermal insulation of rainscreen cladding systems.

Rainscreen cladding systems comprise outer cladding panels that are bolted to a supporting framework of rails, which are supported by cleats fixed back to the building structure. A layer of insulation is fixed independently against the building substructure using proprietary insulation fasteners. An airspace separates the insulation from the outer cladding panels. This allows wind driven rain to run down the back of the rainscreen panels without penetrating the insulation.

Rocksilk RainScreen Slab is recommended for this application, as it is lightweight but rigid enough to resist the compression forces generated when installing the insulation slabs to the masonry substrate. The water repellent additive in Rocksilk RainScreen Slab also provides a further line of defence against rain penetration of the external wall.

Installation

For detailes installation instructions please refer to the separate Knauf Insulation brochure ”Masonry Solid and Curtain Walls - Non-Residential” Ref: B/NR/XW/3.