What strength class does Norway Spruce achieve?

Norway Spruce routinely achieves C24 strength class under machine stress grading, with characteristic bending strength of 24 N/mm² and mean modulus of elasticity of 11,000 N/mm². Slow-grown Scandinavian spruce can achieve C30 (30 N/mm² bending strength).

Norway Spruce routinely achieves C24 strength class under machine stress grading, with characteristic bending strength of 24 N/mm² and mean modulus of elasticity of 11,000 N/mm². Slow-grown Scandinavian spruce can achieve C30 (30 N/mm² bending strength). For glulam production, spruce achieves GL24h to GL32h homogeneous grades and GL24c to GL36c combined grades, enabling spans of 20 m+ in single members.

Why this matters

This question relates to Norway Spruce for Construction: Grade Properties & Specification, which covers the broader topic in detail. Understanding this specific aspect helps architects, builders, and timber dealers make informed specification decisions.

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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.