Knauf Insulation’s Rocksilk RainScreen Slab has earned the industry’s first BBA certification for double layering and for use below the damp proof course (DPC), making it certified for the broadest range of build-ups of any rainscreen solution on the market.
“We know how much architects and specifiers value the peace of mind that comes from BBA certification,” said Luke Davies, Product Manager at Knauf Insulation. “Our RainScreen Slab is already certified for use in steel frames and behind masonry. Adding these applications and installation methods means customers can rely on Rocksilk RainScreen Slab to provide a robust and durable solution, certified for all common rainscreen build-ups.”
Rocksilk RainScreen Slab is a non-combustible Rock Mineral Wool slab with Euroclass A1 reaction to fire classification, which means it complies with the strictest requirements of Approved Document B for dwelling buildings over 18m tall. It is available in the widest range of thicknesses up to 250mm, with a thermal conductivity of 0.034W/mK.
Rocksilk RainScreen Slab can be used in situations where it bridges the DPCs of the inner and outer leaf because it does not absorb water by capillary action. It is manufactured with a water repellent additive which also preserves its integrity while exposed during construction, and 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. The BBA certification also covers timber frame applications with a masonry outer leaf, and on reinforced concrete substrates.
Rocksilk RainScreen Slab is optimised for ease of installation. The improved robustness of the product makes it easy to manoeuvre in place, while still being able to adapt to minor imperfections in the substrate. The product is supported with extensive installation guides, which cover the double layering and below DPC applications.
Rocksilk RainScreen Slab is manufactured using ECOSE Technology, Knauf Insulation’s unique bio-based binder, which contains no added formaldehyde or phenol. Mineral Wool insulation made with ECOSE Technology is more environmentally friendly than products made using traditional formaldehyde-based binders, and so helps earn addition points within green building rating systems such as BREEAM and LEED.