How long can timber be stored on site before use?

Maximum recommended storage durations depend on protection level: Fully wrapped (mill packaging intact): 4–8 weeks; Covered with tarpaulin (top and sides): 4–6 weeks; Covered top only (sides open): 2–4 weeks; Uncovered: 1–2 weeks maximum (weather-dependent). Beyond these periods, timber should be re-checked for moisture content, distortion, and surface condition before use.

Maximum recommended storage durations depend on protection level: Fully wrapped (mill packaging intact): 4–8 weeks; Covered with tarpaulin (top and sides): 4–6 weeks; Covered top only (sides open): 2–4 weeks; Uncovered: 1–2 weeks maximum (weather-dependent). Beyond these periods, timber should be re-checked for moisture content, distortion, and surface condition before use. Prolonged storage increases risk of: moisture uptake, blue stain development, distortion, UV degradation of surface, and physical damage from site activities. Plan deliveries to minimise storage time — just-in-time delivery is ideal.

Why this matters

This question relates to Timber Storage on Construction Sites: Best Practice Guide, 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 Storage on Construction Sites: Best Practice Guide

Related questions

• How should structural timber be stored on a construction site?
• What happens if timber gets wet on site?
• Do I need to cover timber with the sides open or closed?

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.