Discover 75mm Unilin CavityTherm CT/PIR Full Fill Cavity Insulation, an advanced thermal solution engineered for conventional cavity walls, achieving passive-level U-Values as low as 0.12 W/m2K. This system delivers superior thermal bridging performance even in cavities narrower than 75mm.
Brand: Unilin
Model: 75mm CT/PIR Full Fill Insulation
Thickness: 75mm
Length: 1200mm
Width: 450mm
Size: 1200mm x 450mm
Pack Weight: 4.90kg
Pack Coverage: 2.16m2
Dimensions: 1,200mm x 450mm x 75mm
Density: 30Kg/m3
Compressive Strength: 100kPa
Material: Polyisocyanurate (PIR insulation Board)
Profile: Unique engineered profiled facing
Inner facing: Foil facing
Outer facing: HIP facer
R-Value: 3.57m2K/W
Thermal Conductivity: 0.021 W/mk
Vapour Resistivity: 100 MNs/gm
Applications: Cavities ǀ External Walls
BBA Certified: Yes (No. 10/4786)
Features: Excellent U-Values ǀ Passive House
The 75mm CavityTherm CT/PIR wall insulation board is a sophisticated composite panel incorporating a high-performance PIR core with a thermal conductivity of 0.021W/mK. These boards feature gas-tight facings with a profiled HIPS skin bonded during manufacturing to create an effective drainage plane. The engineered profiled facing of 75mm CavityTherm directs moisture infiltration from the external wall downwards along the protective surface, channelling it to the outer leaf. This design provides robust protection against wind-driven rain exposure.
Additionally, the 75mm Unilin Full Fill Insulation Board incorporates specially engineered rebated edge details on all four sides, creating a secure interlocking system during installation. This precision-engineered interlock maintains continuous insulation coverage, delivering outstanding thermal bridging performance.
When installed in a conventional 100-150mm cavity using standard construction methods and materials, 75mm CavityTherm achieves U-values as low as 0.12W/m2K. This represents an effective and economical approach to low-energy building standards whilst preserving the character of period and traditional properties.
The 75mm Unilin CT/PIR engineered profiled facing effectively manages moisture that may penetrate the external wall insulation by directing it downwards along the protective surface. This design redirects moisture back to the outer leaf, delivering enhanced protection against wind-driven rain, particularly important given increasing weather exposure from climate variability.
Browse our Unilin range and refine by thickness or coverage using the left-hand filters. For product suitability advice tailored to your project or to request a volume discount quotation, contact us by phone on +4402038839057, email sales@insulationbee.co.uk or via Live Chat - Competitive UK Insulation Pricing.








