How does oak compare to softwood for structural beams?

Oak offers approximately 2–3× the bending strength of C24 softwood (30–40 N/mm² vs 24 N/mm²) and significantly higher density (570–700 kg/m³ vs 350–420 kg/m³). This allows smaller cross-sections for equivalent spans, which is advantageous where headroom is limited.

Oak offers approximately 2–3× the bending strength of C24 softwood (30–40 N/mm² vs 24 N/mm²) and significantly higher density (570–700 kg/m³ vs 350–420 kg/m³). This allows smaller cross-sections for equivalent spans, which is advantageous where headroom is limited. However, oak is 4–8× more expensive per cubic metre than C24 spruce, heavier to handle, and harder to machine. Oak is therefore specified where its aesthetic quality, durability, or compact section size justifies the premium.

Why this matters

This question relates to European Oak for Structural & Architectural Applications, 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:

→ European Oak for Structural & Architectural Applications

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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. All technical content is reviewed by qualified timber technologists before publication.