What is the difference between GL24h and GL28h for architectural applications?

GL24h and GL28h differ in strength class: GL24h has characteristic bending strength of 24 N/mm² and mean MOE of 11,500 N/mm², while GL28h has 28 N/mm² bending and 12,600 N/mm² MOE. For architectural applications, the choice affects beam depth — GL28h allows approximately 10–15% shallower sections for the same span and load.

GL24h and GL28h differ in strength class: GL24h has characteristic bending strength of 24 N/mm² and mean MOE of 11,500 N/mm², while GL28h has 28 N/mm² bending and 12,600 N/mm² MOE. For architectural applications, the choice affects beam depth — GL28h allows approximately 10–15% shallower sections for the same span and load. However, GL28h requires higher-grade laminations (C30 minimum vs C24 for GL24h), which may limit availability of premium visual-grade material. For most architectural applications, GL24h provides adequate performance with better visual-grade availability.

Why this matters

This question relates to Glulam Beam Design: Aesthetic & Structural Possibilities, 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:

→ Glulam Beam Design: Aesthetic & Structural Possibilities

Related questions

• What spans can glulam beams achieve?
• Can glulam beams be curved?
• What surface finish options are available for exposed glulam?

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.