What is Thermal Conductivity?

Definition

Thermal conductivity measures a material’s ability to transfer heat, expressed as a lambda (λ) value in W/mK. Lower values indicate better insulation.

Benefits

• Determines the efficiency of walls, roofs, and floors.
  
• Guides material choice for achieving U-value targets.
  
• Helps compare insulation performance across product ranges.
  

Applications

• PIR boards with low λ-values, such as ECO/CT, ECO/CW, ECO/MA, XtroLiner, Safe-R, Thin-R, FR/ALU, FR/MG, offer excellent performance with minimal thickness.
  
• Used in cavity walls, warm roofs, cold roofs, drylining, soffits, and flat roofs.
  

Best Practice Tips

• Pair low λ-value boards with airtight installation.
  
• Avoid gaps to prevent thermal bridging.
  
• Consider building regulations for roof, wall, and floor assemblies.