Wetherby Wall Systems, part of the ROCKWOOL Group, has introduced SOQEL A2, the UK’s first fully fire-tested External Wall Insulation (EWI) system designed specifically for use below the damp proof course (DPC).
This new solution addresses a critical but often overlooked area in building design. In line with updated UK Building Regulations, materials used on buildings over 11 metres must now meet a minimum A2-s1,d0 fire classification. While insulation systems for upper façades have evolved to meet this standard, below DPC treatments have remained largely untested and disconnected from the wider façade system. SOQEL A2 changes that.
Engineered for use at ground level and other vulnerable zones such as balconies, walkways, and plant rooms, SOQEL A2 provides tested performance where it’s needed most. The system uses Coverrock X-2 insulation with a durable factory-applied coating that protects the A1-rated Stone Wool core during application and enhances adhesion for the finishing layers. It’s reinforced with Heck K+A SL basecoat and Heck CER Mesh to offer lasting resistance to impact, moisture, and weather extremes.
A key benefit of SOQEL A2 is its visual integration. The system includes Heck 4S Silicone Render, which allows for a colour-matched, seamless finish with the upper façade. This avoids the patchy or inconsistent appearance typical of older below DPC solutions, such as bitumen coatings. The result is a cleaner, more unified façade that doesn’t compromise safety or aesthetics.
Joe Ragdale, Technical Director at Wetherby Wall Systems, said:
“SOQEL A2 is the first system of its kind to undergo full fire testing for below DPC use. Developed with our ROCKWOOL Group partner HECK in Germany, it’s a major step forward in ensuring fire safety compliance across the entire building envelope. It’s a practical, durable, and visually cohesive option for both refurbishment and new build.”
With SOQEL A2, Wetherby extends its portfolio of compliant, high-performance façade solutions into a space where safety, appearance, and durability have often been difficult to balance.
For technical support or project enquiries, visit www.wall-systems.co.uk
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