EN 16351

EN 16351:2021 is the European standard that defines the requirements for cross-laminated timber (CLT) used in structural applications such as buildings and bridges. It’s a key reference for manufacturers, designers, and engineers working with CLT across Europe.

🪵 What EN 16351 Covers

This standard sets out provisions for:

• Material composition:
  
  

  • CLT panels made of coniferous species or poplar

  • At least three orthogonally bonded layers

  • Layer thickness between 6 mm and 60 mm

  • Optional inclusion of wood-based panels (up to 45 mm thick)

• Panel types:
  
  

  • Type 1: Solid wood layers without large finger joints

  • Type 2: Solid wood layers with large finger joints

  • Type 3: Combination of wood and wood-based panels

• Performance requirements:
  
  

  • Structural integrity

  • Moisture resistance (Service Class 1 or 2 per EN 1995-1-1)

  • Biological durability

  • Fire resistance (fire-retardant treatments not covered)

• Manufacturing and quality control:
  
  

  • Adhesive specifications

  • Finger joint dimensions (≥45 mm)

  • Assessment and Verification of Constancy of Performance (AVCP)

🔗 Full standard description – BS EN 16351:2021