Can timber achieve 60 minutes fire resistance?

Yes. Timber members can achieve 60 minutes (REI 60) or more fire resistance through the reduced cross-section method.

Yes. Timber members can achieve 60 minutes (REI 60) or more fire resistance through the reduced cross-section method. By oversizing the initial cross-section to account for charring loss, the residual section after 60 minutes of fire exposure retains sufficient capacity to carry the fire-condition loads. For a 60-minute rating, add approximately 45 mm to each exposed face (39 mm charring + 7 mm zero-strength layer).

Why this matters

This question relates to Fire Resistance of Structural Timber: Charring Rates & Eurocode 5, 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:

→ Fire Resistance of Structural Timber: Charring Rates & Eurocode 5

Related questions

• What is the charring rate of structural timber?
• How does timber compare to steel in fire?
• What is the zero-strength layer in timber fire design?

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.