Can timber be too dry?

Timber below 8% MC is considered over-dried for most construction applications. Over-dried timber will absorb moisture from the environment and swell, potentially causing buckling in constrained installations (e.g.

Timber below 8% MC is considered over-dried for most construction applications. Over-dried timber will absorb moisture from the environment and swell, potentially causing buckling in constrained installations (e.g. tongue-and-groove flooring without expansion gaps). However, over-drying is rare in structural timber supply chains. The greater risk is always timber being too wet rather than too dry.

Why this matters

This question relates to Structural Timber Moisture Content: Why 12% Matters, 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:

→ Structural Timber Moisture Content: Why 12% Matters

Related questions

• What moisture content should structural timber be?
• How do you measure timber moisture content?
• What happens if timber is installed too wet?

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.