RainScreen Façade System Solutions

Knauf Insulation Rainscreen Slab
DESIGN OUT RISK WITH Rocksilk® RainScreen Slab

High performance non-combustible insulation for rainscreen façade systems.

Rainscreen façade systems are lightweight when compared to brick and masonry solutions and can provide the designer with a wide range of aesthetic options.

In addition to thermal performance, fire performance of insulation materials is a crucial consideration, particularly when designing buildings over 18m in height or when the building is to have high occupancy levels or be used by vulnerable occupants.

Rocksilk® RainScreen Slab:

  • BBA certified
  • 3D U-value calculations
  • Wind load testing
  • Water repellent additive
  • More robust slab
  • Improved mechanical characteristics 
  • Enhanced thickness range 50-250mm

Rainscreen slab uvalue.png

How accurate are your thermal calculations?

There are several options for calculating the thermal performance of rainscreen façade systems - if the calculation is even marginally inaccurate it can have a damaging impact on the overall thermal performance of a building which makes it crucially important to ensure the right method is used.

Knauf Insulation offers FREE 3D U-value calculations to BS EN 10211 as standard - the most accurate method for calculating U-values of rainscreen façade systems – ensuring the thermal requirements specified during design stage are achieved.

Request a 3D U-value calculation

Are you minimising fire risk?

Specifying non-combustible products in Rainscreen applications minimises the risk of fire spread. Use of Rocksilk® RainScreen Slab ensures that the insulation does not contribute to the fire load or spread of fire. In turn this can help to maximise the structure’s stability under fire load. In all cases the whole wall system should be considered

Rocksilk® RainScreen Slab has the best possible Euroclass A1 Reaction to Fire Classification meaning it will not contribute to the spread of a fire in any way.

Building regulations (Approved Document B and an amendment to Regulation 7) restrict the use of combustible materials in the external walls of certain buildings over 18m in height, limiting the use of materials to those achieving a Euroclass Reaction to Fire Classification of A1 or A2 s1-d0 in certain building types.

Book a CPD

New Project (19) (3).png

Acoustic Rainscreen.jpg

Can building occupants hear themselves think? ­­

Acoustic performance is becoming an increasingly important consideration when designing a building due to the increase in urbanisation and as such the rise in noise levels around populated areas.

The effects of noise are many; noise causes fatigue, irritation, loss of efficiency and permanent damage to hearing with vulnerable adults and children most susceptible to its effects.

In low mass structures such as rainscreen façade systems, absorption is a critical component to reduce unwanted noise from passing through the system. Rocksilk® RainScreen Slab has excellent acoustic absorbance properties, which contribute towards the acoustic performance of the structure onto which it is mounted.

As sound waves hit the insulation, a fraction of the sound waves are reflected, transmitted or absorbed. The random orientation of the fibres in Rocksilk® RainScreen Slab allows for a greater number of sound waves to be absorbed, converting part of the energy into heat and transmitting part through the fibres, because the sound waves cannot travel using a direct path from surface to surface.

Achieving strong levels of acoustic performance is key to delivering a building in which the occupants can enjoy a comfortable environment whether that be for working, living or enjoying leisure activities.

Need BREEAM credits?

Rocksilk® RainScreen Slab helps to contribute towards obtaining BREEAM credits, helping to deliver high performing green buildings which are healthier, more environmentally responsible and are more cost-effective across their full lives. To learn more please download our Rock Mineral Wool BREEAM help sheet.

Download Now


ECOSE® Technology – Our highly sustainable bio-based binder

Our revolutionary sustainable bio-based binder is used in the manufacture of all of our Glass Mineral Wool products, and the majority of our Rock Mineral Wool products. Invented nearly 10 years ago, it is not only unique, but very much central to our sustainability strategy.


Build with Confidence

New Project (32).png