When should I reject a timber delivery?

Reject timber if: (1) Grade stamps are missing or illegible (cannot verify structural grade); (2) Moisture content exceeds 22% MC (or exceeds specification); (3) Visible decay or active insect infestation present; (4) Excessive distortion beyond grade limits (bow >10 mm/2 m, twist >8 mm/2 m, spring >8 mm/2 m); (5) Dimensions outside tolerance (>±2 mm on regularised timber); (6) Wrong species or grade delivered; (7) Packaging severely damaged with evidence of prolonged water exposure; (8) No Declaration of Performance or certification documentation available. Document all rejections with photographs and written notification to supplier.

Reject timber if: (1) Grade stamps are missing or illegible (cannot verify structural grade); (2) Moisture content exceeds 22% MC (or exceeds specification); (3) Visible decay or active insect infestation present; (4) Excessive distortion beyond grade limits (bow >10 mm/2 m, twist >8 mm/2 m, spring >8 mm/2 m); (5) Dimensions outside tolerance (>±2 mm on regularised timber); (6) Wrong species or grade delivered; (7) Packaging severely damaged with evidence of prolonged water exposure; (8) No Declaration of Performance or certification documentation available. Document all rejections with photographs and written notification to supplier.

Why this matters

This question relates to Timber Quality Control: Inspection, Grading & Acceptance Criteria, 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:

→ Timber Quality Control: Inspection, Grading & Acceptance Criteria

Related questions

• What should I check when timber is delivered to site?
• How do I read a timber grade stamp?
• What moisture content should structural timber be at delivery?

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.