Reaction to Fire (Classification A1)

Datasheet confirming Gyvlon flowing screeds achieve the highest reaction-to-fire classification (A1) under EN 13501-1.

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Anhydrite-based Gyvlon screeds are classified A1 — non-combustible — under EN 13501-1, the highest possible reaction-to-fire rating. This datasheet sets out the classification basis and its implications for compartmentation, escape routes and high-rise residential specifications.

Use this document when demonstrating compliance with Building Regulations Approved Document B and the post-Grenfell requirements applying to relevant residential buildings.