How do I calculate the carbon benefit of specifying timber?

Calculate using EN 15978 methodology: (1) Determine timber volume in the design (m³); (2) Apply sequestration factor: timber volume × 210 kg CO₂/m³ stored; (3) Subtract production emissions: timber volume × 50–80 kg CO₂/m³; (4) Calculate substitution benefit: compare against the alternative material's embodied carbon for the same structural function; (5) Sum for net carbon benefit. Tools like OneClick LCA, eTool, and the IStructE Carbon Calculator automate this process.

Calculate using EN 15978 methodology: (1) Determine timber volume in the design (m³); (2) Apply sequestration factor: timber volume × 210 kg CO₂/m³ stored; (3) Subtract production emissions: timber volume × 50–80 kg CO₂/m³; (4) Calculate substitution benefit: compare against the alternative material's embodied carbon for the same structural function; (5) Sum for net carbon benefit. Tools like OneClick LCA, eTool, and the IStructE Carbon Calculator automate this process. For a typical house, switching from masonry to timber frame saves 20–40 tonnes CO₂ in embodied carbon.

Why this matters

This question relates to Net Zero Buildings: The Role of Timber in Decarbonisation, 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:

→ Net Zero Buildings: The Role of Timber in Decarbonisation

Related questions

• How does timber help achieve net zero buildings?
• What is the difference between operational and embodied carbon?
• How much carbon does a timber building store?

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.