New insulation system meets fire safety rules for buildings over 11 metres

Wetherby Wall Systems has announced the launch of SOQEL A2, a below damp-proof course (DPC) external wall insulation (EWI) system designed to meet UK fire safety standards.

As reported by Wetherby Wall Systems, SOQEL A2 is the first fully fire-tested system designed for below DPC applications and meets the A2-s1,d0 fire classification.

This meets current UK Building Regulations for materials used in buildings over 11 metres in height.

The system became available on 17 March 2025 and is intended to offer contractors, architects and specifiers a compliant and durable alternative to traditional below DPC solutions.

Designed for high-risk areas with foot traffic and moisture exposure

SOQEL A2 is intended for use in base areas of external wall insulation systems, including balconies, plant rooms and walkways.

The system features Coverrock x-2 pre-coated insulation, which is bonded to protect the A1-rated stone wool core during application.

This design is aimed at withstanding impact and moisture exposure in high-risk areas.

It also incorporates Heck K+A SL coating and Heck CER Mesh.

According to the company, this combination is designed to improve impact resistance and durability in environments exposed to weather and pedestrian activity.

Appearance designed to match wider façade systems

Wetherby Wall Systems stated that the SOQEL A2 system integrates with existing façade systems to avoid visual disruption.

The inclusion of Heck 4S Silicone Render provides a seamless finish intended to match the surrounding insulated façade.

This differs from traditional below DPC treatments, such as bitumen paint, which can contrast with the building’s appearance.

The system is positioned as a functional and aesthetic solution for areas where performance and appearance both need to be considered.

Joint development with HECK in Germany

Wetherby Wall Systems developed the SOQEL A2 system in collaboration with HECK, part of the ROCKWOOL Group.

Joe Ragdale, Technical Director at Wetherby Wall Systems, said: “We have worked alongside our ROCKWOOL Group sister company, HECK in Germany to launch this innovative system into the UK market.

“We are delighted to introduce SOQEL A2, the first system of its kind for below DPC and base areas.”

He added: “This solution provides architects and contractors working on remediation projects with a compliant, durable, and efficient way to enhance building safety while ensuring a seamless finish alongside insulated façade systems.”

SOQEL A2 launched for compliant below DPC insulation in UK construction: Summary

Wetherby Wall Systems has launched the SOQEL A2 insulation system for below DPC use in the UK.

The system is designed to meet the A2-s1,d0 fire classification, in line with UK Building Regulations for materials used in buildings over 11 metres.

SOQEL A2 is aimed at base areas, balconies, plant rooms and walkways where fire resistance, impact protection and moisture durability are required.

The product features Coverrock x-2 pre-coated insulation, Heck K+A SL coating and Heck CER Mesh.

It also uses Heck 4S Silicone Render to provide a seamless finish.

The system was developed in partnership with HECK in Germany, also part of the ROCKWOOL Group.

Wetherby Wall Systems stated that SOQEL A2 is intended to replace traditional below DPC solutions, including bitumen paint, by offering a compliant and durable option.