Knauf Insulation’s RainScreen Slab earns two BBA certificates

By Knauf Insulation
July 03, 2019

Knauf Insulation’s RainScreen Slab has been certified by the British Board of Agrément (BBA) for use in high-rise residential applications and for use behind masonry. BBA certification is recognised globally and gives South African customers reassurance that the products have been rigorously tested for each specified application.



The two BBA certifications cover RainScreen Slab for use on both weathertight ventilated cladding systems and as partial fill insulation on conventional steel-frame walls with a masonry outer leaf. RainScreen Slab is a semi-rigid Rock Mineral Wool insulation slab suitable for use on both domestic and non-domestic buildings. It is non-combustible, achieving the best possible A1 Euroclass Reaction to Fire Classification.

“Non-combustible insulation is the right choice for architects, specifiers, contractors and homeowners as it will not contribute to the development or spread of fire,” said Suria Ramnarain, Sales Development Manager at Knauf Insulation. “BBA certification ensures customers specifying or installing Earthwool® RainScreen Slab can have absolute confidence in its quality and performance for buildings of any height or for any rainscreen application.”

RainScreen Slab has a thermal conductivity of 0.034W/mK. It offers superior robustness and durability, with a water repellent additive to preserve its integrity while exposed during construction. It has been wind load tested by the Building Research Establishment to a maximum design pressure of 3,600Pa or 76m/s – the equivalent of a category 5 hurricane.

RainScreen Slab is optimised for ease of installation. The improved robustness of the product makes it easy to manoeuvre in place, and it is designed to adapt to minor imperfections in the substrate.

“RainScreen Slab is a highly versatile insulation solution that offers superior thermal performance. This helps property owners to save energy by keeping buildings warm when it’s cold and cool when it’s warm,” added Suria.

It is manufactured using Technology, Knauf Insulation’s patented sustainable bio-based binder that contains no added phenol or formaldehyde. As a result, products made using than mineral wool products made using traditional chemical-based binders, further reducing their ecological footprint. They are also odourless, softer to touch and have the best possible Eurofins Gold Certificate for Indoor Air Comfort, contributing to a high level of indoor air quality.

Thanks to compression packaging, there is more product per pack, and therefore per pallet, and less packaging is used. As a result, Knauf Insulation products require less handling and storage space, helping to improve logistics and efficiencies on site.

Knauf Insulation offers a comprehensive range of Glass and Rock Mineral Wool insulation solutions for roofs, walls, floors and fire protection applications. These include a number of products that have been developed specifically for the South African market.

Last month, the company launched Acoustic Batt, a high performance mineral wool insulation slab designed for use in internal partition walls and intermediate floors to reduce the transmission of noise between rooms. 100mm Acoustic Batt has a calculated Noise Reduction Coefficient (NRC) value of 1.04.

Acoustic Batt is classified as non-combustible Euroclass A1 Reaction to Fire classification. It is a semi-rigid slab with a width of 600mm to suit standard stud centres, making Acoustic Batt quick and easy to install. The insulation is lightweight, which together with compression packaging, means packs are easy to carry. This also helps to prevent damage to packaging associated with dragging larger, heavier packs on site.

To ensure its customers specify the right insulation for the application, Knauf Insulation has launched an Insulation Solutions Guide. The guide features its extensive range of non-combustible, high-performance insulation solutions ordered by application. This means customers can identify which products are best suited for roofs, walls, floors and fire protection. Product data detailing features and benefits are then listed in full at the back of the Insulation Solutions Guide.

For further information about Acoustic Batt or to download the datasheet, visit