Minimum Order Quantity: 5 packs
Unilin CavityTherm is a built-in PIR insulation board for traditional full-fill cavity wall applications.
It is designed to achieve passive-level U-values as low as 0.13 W/m²K with excellent thermal bridging performance in cavities up to 150mm wide, supporting high-performance energy-efficient construction.
Unilin CavityTherm is a high-performance continuous insulation system, designed for full-fill cavity wall applications.
The composite PIR board has a thermal conductivity of 0.021 W/mK and provides built-in protection against wind-driven rain.
Key Features:
- Engineered HIPS outer facer for rain protection
- Moisture redirected to the outer surface
- Pre-positioned slots for sloping wall ties
- Fully engineered jointing system for continuity
- Bespoke accessories to insulate around services
- Excellent thermal bridging values
- Achieves passive-level U-values in suitable constructions
- Typical R-value of 6.90 for the 150mm version
- Range: CavityTherm
- Material: PIR / Polyisocyanurate insulation
- Fire Classification: Euroclass F
Each pack covers 2.16m² and contains four boards (1200mm x 450mm).
CavityTherm’s unique profiled facing directs moisture away from the insulation and back onto the external leaf, providing extra protection.
The rebated edges allow for tight interlocking, ensuring a continuous, effective insulation layer.
Thermal Conductivity: 0.021 W/mK (BS EN 13165)
R-value: 6.90 (150mm version)
Typical achievable U-value: 0.13 W/m²K (standard wall build-up, Inner Block 100mm)
For more information:
- See the Product Brochure and Installation Guide here
- See the Agrément Certificate here
- See the Specification Clause here
- See the Declaration of Performance here
Typical Physical Characteristics:
- Density: 30 kg/m³
- Compressive Strength: >100 kPa @ 10%
- Thermal Conductivity: 0.021 W/mK
- Service Temperature: -20°C to +100°C
- Manufactured to: EN 13165
Unilin CavityTherm has gas-tight facings, with one additional face bonded to provide a drainage plane, directing moisture onto the external leaf.
Unilin CavityTherm’s specially designed profile maintains a residual channel, helping protect the wall structure.
Installing Unilin CavityTherm helps achieve passive-level U-values suitable for modern low-energy building designs while maintaining a 150mm full-fill cavity wall construction.
Note:
Delivery of this bulky product is available nationwide but will be subject to a bulk delivery charge.
Delivery charges are calculated during checkout according to the delivery address provided.
Should you require very large volumes of this product then we may be able to improve your delivery charge.
To discuss this you can call us on 0818 888 000 for more information and confirm pricing.
Frequently asked questions:
What is CavityTherm?
A PIR core insulation board with a thermal conductivity of 0.021 W/mK designed for high-performance full-fill cavity wall construction.
It features gas-tight facings, a profiled HIPS skin for drainage, and rebated edges for tight interlocking.
What are the benefits?
CavityTherm ensures continuity of insulation, offering excellent U-values that support low-energy building designs without compromise.
What wall ties should be used?
Standard stainless steel wire wall ties are suitable for CavityTherm.
Low-conductivity wall ties may help further reduce thermal bridging.
What types of buildings can use CavityTherm?
Suitable for external masonry cavity walls in both domestic and non-domestic buildings, up to 25m high.
What are the accessories for?
Accessories are designed to improve airtightness and thermal bridging.
They include bespoke pieces for insulation around services and ensure continuity in the insulation layer.
What is the ‘Engineered Edge Detail’?
Ensures continuity and compliance with building regulations, reducing the risk of U-value penalties during calculations.
What tape should be used to seal board joins?
Waterproof tape or a self-adhesive jointing strip.
Ensure the surfaces are dry before application.
