What size glulam beam do I need for a 6 metre span?

For a 6-metre simply-supported span under typical domestic roof loading (1.5 kN/m² imposed + 1.0 kN/m² dead), a GL24h beam of approximately 120×300mm is sufficient. For floor loading or heavier roof loads, increase to 140×360mm.

For a 6-metre simply-supported span under typical domestic roof loading (1.5 kN/m² imposed + 1.0 kN/m² dead), a GL24h beam of approximately 120×300mm is sufficient. For floor loading or heavier roof loads, increase to 140×360mm. Always verify with structural calculations — these are indicative sizes only.

Why this matters

This question relates to BSH Glulam Beams: Span Tables, Load Capacity & Specification 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:

→ BSH Glulam Beams: Span Tables, Load Capacity & Specification Guide

Related questions

• How far can a glulam beam span?
• What is the difference between GL24h and GL28h?
• Is glulam stronger than solid timber?

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.