How do I specify timber grade in a tender document?

Specify timber grade using the EN 338 strength class system (C16, C24, C30 for softwood; D30, D40, D50 for hardwood). State the grading method required — machine stress grading (MSG) is preferred for consistency.

Specify timber grade using the EN 338 strength class system (C16, C24, C30 for softwood; D30, D40, D50 for hardwood). State the grading method required — machine stress grading (MSG) is preferred for consistency. Include the grading standard reference (EN 14081-1) and require CE marking with a valid Declaration of Performance (DoP). Avoid proprietary grade names or national-only systems that limit competition.

Why this matters

This question relates to How to Write a Timber Specification for Construction Tenders, 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:

→ How to Write a Timber Specification for Construction Tenders

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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.