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A1 Non-Combustible EWI Systems

Introducing a  breakthrough EWI system achieving an A1 non-combustible fire rating.

An A1 rated fireproof insulation solution in the UK for building facades, exclusively available from Wetherby. The A1 System sets new standards in external wall insulation fire performance.

The system is finished with Wetherby Heck ED Mineral Render finishing coat, which is ideal for use with stone wool insulation, providing great breath-ability.

To achieve an A1 rating, the system must be classified to BS EN 13501-1 using the following fire tests.

  • EN 13823 SBI (Single Burning Item) – Used to determine the reaction to fire by exposing a flame to the system finish.
  • BS EN ISO 1716:2010 – Bomb test. Each component of the system is ‘blown up’ to measure heat output (calorific value). All components must be A1.

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Wetherby A1 System


Contact Us

For information on the A1 system, a copy of the ETA certificate or technical advice, please speak to our Technical team on 0800 1073299 or email below.


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