Discover the 125mm Unilin CavityTherm CT/PIR Full Fill Cavity Insulation, an engineered composite solution engineered for conventional wall construction. This advanced system delivers exceptional thermal performance with U-Values as low as 0.12 W/m2K, whilst managing moisture effectively through intelligent design features.
Brand: Unilin
Model: 125mm CT/PIR Full Fill Insulation
Thickness: 125mm
Length: 1200mm
Width: 450mm
Size: 1200mm x 450mm
Pack Weight: 6.70kg
Pack Coverage: 2.16m2
Dimensions: 1,200mm x 450mm x 125mm
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: 5.71m2K/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 125mm CavityTherm CT/PIR wall insulation board is a sophisticated composite panel incorporating an enhanced PIR core with an exceptional lambda value of 0.021W/mK. These boards feature gas-tight facings, with one surface bonded to a profiled HIPS skin during manufacture to create an effective drainage plane. The profiled facing of 125mm CavityTherm directs any moisture that may penetrate the external wall downwards along the protective surface, redirecting it onto the outer leaf. This construction provides superior resistance against wind-driven rain.
Additionally, the 125mm 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 ensures continuous insulation coverage, delivering exceptional thermal bridging performance.
When installed in a conventional 100-150mm cavity using standard construction practices and materials, 125mm CavityTherm achieves impressive U-values of 0.12W/m2K or better. This represents an effective and economical approach to meeting low-energy design requirements, whilst preserving the aesthetic appeal of traditional properties.
The 125mm Unilin CT/PIR profiled facing skilfully directs any moisture that could infiltrate the external wall insulation downwards along the protective surface. This design redirects moisture back onto the external leaf, delivering enhanced protection against wind-driven rain, particularly important in today's climate conditions.
Browse our Unilin range and refine by thickness or coverage using the left-hand filters. For project-specific advice, suitability assessment, or bulk pricing enquiries, contact us on +4402038839057, email sales@insulationbee, or use Live Chat - Lowest UK Insulation Prices.








