Mass Timber: CLT, Glulam, and Connections
Mass timber refers to engineered wood products used in construction, notably cross-laminated timber (CLT) and glued laminated timber (glulam). CLT consists of layers of wood panels stacked crosswise and glued, providing strength and stability for floors, walls, and roofs. Glulam is made by bonding layers of lumber with strong adhesives, enabling long spans and curved shapes. Critical to mass timber construction are specialized connections, ensuring structural integrity, fire resistance, and efficient assembly.
Mass Timber: CLT, Glulam, and Connections
Mass timber refers to engineered wood products used in construction, notably cross-laminated timber (CLT) and glued laminated timber (glulam). CLT consists of layers of wood panels stacked crosswise and glued, providing strength and stability for floors, walls, and roofs. Glulam is made by bonding layers of lumber with strong adhesives, enabling long spans and curved shapes. Critical to mass timber construction are specialized connections, ensuring structural integrity, fire resistance, and efficient assembly.
💡 Key Takeaways
- Distinguish CLT and glulam and identify their typical structural uses in mass timber.
- Identify common mass timber connections (screws, bolts, and plates) and how they influence strength, stiffness, and fire performance.
- Explain key design and fabrication considerations for mass timber assemblies, including panel sizes, spacing, and alignment.
- Understand the benefits and limitations of mass timber, plus basic code and sustainability considerations.
❓ Frequently Asked Questions
What is mass timber?
Mass timber refers to engineered wood products designed for structural use, created by layering or laminating wood to form strong panels and members for floors, walls, and frames (e.g., CLT, glulam).
What is CLT (Cross-Laminated Timber)?
CLT is made from layers of lumber laid in alternating directions and glued to form thick, stiff panels used for walls, floors, and roofs.
What is Glulam?
Glulam stands for glued laminated timber. It combines multiple lumber laminations glued together to create long, strong beams and columns.
What are common mass timber connections?
Common connections include bolts, screws, timber-to-timber connectors, steel brackets/plates, and specialized fasteners designed for shear and tension, all chosen to meet fire and structural requirements.