ROCKWOOL is delighted to announce that its RAINSCREEN DUO SLAB® has become the first stone wool product to receive approval by the British Board of Agrément (BBA) for use in Ventilated rainscreen systems.

BBA certification is recognised throughout the construction industry and is a sought after accreditation for manufacturers. It is also incredibly important to specifiers, as it is a mark of quality, safety and reliability that provides reassurance of the product.

In order to achieve the BBA Agrément Certificate, products have to pass a series of comprehensive assessments, including laboratory tests, on-site evaluations, quality management checks and inspections of production. The RAINSCREEN DUO SLAB® was tested for factors such as thermal performance, condensation risk, behaviour in relation to fire, and durability in order to meet UK British Regulations. The ROCKWOOL product successfully met all these requirements and achieved certification status for use as a Hybrid frame system and Rainscreen system.

As the only stone wool product certified by the BBA for use in Ventilated rainscreen systems, this approval helps support and endorse ROCKWOOL’s key product messages:

  • Peace of mind and quality of life
  • Innovative products for modern life
  • Lasting, durable and resilient
  • Energy efficiency
  • Fire resilience
  • Health safety and wellbeing
  • Natural solutions and sustainability

“It is incredibly important to us to put our products through the BBA process, as the certification provides architects with peace of mind when specifying our products” comments Paul Barrett, Product Manager at ROCKWOOL. “It also reinforces the premise that we produce sustainable products that are innovative, durable and long lasting.”

Manufactured from volcanic rock, RAINSCREEN DUO SLAB® is a dual density insulation board that comprises of a robust outer surface and a resilient inner face. By compressing the primary fleece onto the top 15mm of the insulation, the product can be used, unprotected, in severe external weather, including strong wind and rain as experienced at high altitudes. As with all ROCKWOOL products, it’s fire resilient and complies with Approved Document B, achieving the highest Euroclass classification: A1. RAINSCREEN DUO SLAB® also complies with BR135: “Fire Performance of External Insulation for Walls of Multi-Storey Buildings”.

For more information about RAINSCREEN DUO SLAB®, please visit
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