Does insulation type affect fire safety in timber frame?

Yes, significantly. Mineral wool is non-combustible (Euroclass A1) and provides fire resistance — it is the only insulation that actively contributes to fire compartmentation.

Yes, significantly. Mineral wool is non-combustible (Euroclass A1) and provides fire resistance — it is the only insulation that actively contributes to fire compartmentation. Wood fibre and cellulose are combustible but char predictably and are treated with fire retardants (typically Euroclass B or C). PIR/PUR foams are combustible and produce toxic smoke when burning — they must be protected by non-combustible linings (plasterboard) and should not be left exposed during construction. For timber frame buildings, mineral wool or wood fibre in the structural zone provides the safest fire performance.

Why this matters

This question relates to Insulation for Timber Frame Homes: Materials & Performance Comparison, which covers the broader topic in detail. Understanding this specific aspect helps architects, builders, and timber dealers make informed specification decisions.

For full context and additional technical detail, see our comprehensive guide:

→ Insulation for Timber Frame Homes: Materials & Performance Comparison

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About this answer

This answer is part of the PuurModulair Knowledge Base — comprehensive timber specification guidance for architects, builders, and dealers across the UK, EU, and Scandinavia. All technical content is reviewed by qualified timber technologists before publication.