How does oak perform in fire?

Oak has a charring rate of approximately 0.55 mm/min under standard fire exposure (compared to 0.65 mm/min for softwood), owing to its higher density. This means oak members retain structural capacity longer in fire than equivalent softwood sections.

Oak has a charring rate of approximately 0.55 mm/min under standard fire exposure (compared to 0.65 mm/min for softwood), owing to its higher density. This means oak members retain structural capacity longer in fire than equivalent softwood sections. Combined with its higher initial strength, oak beams can achieve 60-minute fire resistance with relatively modest oversizing. The dense char layer formed during burning provides effective insulation to the residual cross-section.

Why this matters

This question relates to European Oak for Structural & Architectural Applications, 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:

→ European Oak for Structural & Architectural Applications

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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.