What is the maximum span for a timber roof truss?

Standard fink (W-pattern) timber trusses in C24 softwood can span up to 12–13 m for domestic pitched roofs. For larger spans, parallel chord trusses reach 18–20 m, and bowstring trusses can achieve 25–30 m.

Standard fink (W-pattern) timber trusses in C24 softwood can span up to 12–13 m for domestic pitched roofs. For larger spans, parallel chord trusses reach 18–20 m, and bowstring trusses can achieve 25–30 m. Beyond 15 m, glulam or LVL members are typically specified for the chords to manage deflection and provide adequate section properties. The practical limit depends on transport constraints (maximum 12 m for standard road delivery) and crane access for installation.

Why this matters

This question relates to Timber Roof Structures: Trusses, Rafters & Engineered Solutions, 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 Roof Structures: Trusses, Rafters & Engineered Solutions

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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.