Knauf Insulation Launches Rocksilk RainScreen Slab, A BBA Certified Solution For Partially Filled Masonry Cavities

Rocksilk RainScreen Slab is now certified for use in masonry cavities, in both high-rise rainscreen façades and domestic low-rise buildings situated in very severe exposure zones.

The BBA certificate means that it complies with building regulations that state that insulation used in partially filled masonry cavities must have third-party accreditation.

Rocksilk RainScreen Slab

Our Rocksilk RainScreen Slab is already BBA certified for the broadest range of build-ups"

“Our Rocksilk RainScreen Slab is already BBA certified for the broadest range of build-ups and thicknesses of any rainscreen solution on the market,” explained Luke Davies, the Rock Mineral Wool Product Manager at Knauf Insulation.

He adds, “This latest addition to the range means that architects and specifiers benefit from the simplicity of using just one product, even if there are different build-ups within the project.”

Suitable for use with all types of masonry cavities

The product is suitable for use with all types of masonry cavities, including blockwork or reinforced concrete substrates with brick, blockwork, or natural stone façades.

Key features include:

• Non-combustible with the best possible Euroclass A1 reaction to fire classification

This means it complies with building regulations that ban the use of combustible insulation on buildings over 18 meters tall in England and Wales and restrict their use on most buildings over 11 meters in Scotland.

• Thermal conductivity of 0.034 W/mK and available in thicknesses between 50 mm and 220 mm

The slabs are designed to interlock to prevent unintended gaps that lead to air leakage and lower thermal performance.

• Manufactured with a water repellent additive that preserves its integrity, while it is exposed during construction

It has also been wind load tested by the Building Research Establishment to a maximum design pressure of 3,600 Pa or 76 m/s – the equivalent of a category 5 hurricane. 

• Easy to install correctly

With a width of 455 mm, Rocksilk RainScreen Slab suits standard centers for installation between wall ties or brick restraint systems. Slabs are robust, so they can be maneuvered into place while maintaining the flexibility required to adapt to minor imperfections in the substrate.

• Manufactured using ECOSE Technology.

Knauf Insulation’s unique bio-based binder contains no added formaldehyde or phenol. Mineral Wool insulation made with ECOSE Technology is more environmentally friendly than insulation made using traditional oil-based binders, as it is 70% less energy-intensive to manufacture. The product is soft to the touch, easy to handle, and generates low levels of dust and VOCs.