When should I specify CLT instead of timber frame?

Specify CLT when: the building exceeds 4–6 storeys (CLT's mass and stiffness suit taller structures), acoustic performance is critical (CLT's mass provides better sound insulation), fire resistance requirements exceed 60 minutes (CLT panels achieve REI 90+ without additional protection), the design features exposed timber soffits (CLT provides a finished surface), or when speed of erection is paramount (large panels reduce piece count and crane lifts).

Specify CLT when: the building exceeds 4–6 storeys (CLT's mass and stiffness suit taller structures), acoustic performance is critical (CLT's mass provides better sound insulation), fire resistance requirements exceed 60 minutes (CLT panels achieve REI 90+ without additional protection), the design features exposed timber soffits (CLT provides a finished surface), or when speed of erection is paramount (large panels reduce piece count and crane lifts).

Why this matters

This question relates to Timber Frame vs CLT vs Glulam: Structural Comparison for Architects, 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 Frame vs CLT vs Glulam: Structural Comparison for Architects

Related questions

• What is the difference between timber frame and CLT?
• What spans can glulam achieve compared to CLT and timber frame?
• Is CLT more expensive than timber frame?

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.