Minimum Order Quantity: 5 packs
Unilin CavityTherm External Corner is a high-performance PIR insulation system component designed for use within the CavityTherm continuous insulation system, delivering excellent thermal performance and enhanced detailing at cavity wall junctions.
It features an enhanced PIR core with a lambda value of 0.021 W/mK, suitable for use within full-fill CavityTherm cavity wall systems as part of a complete engineered system.
The CavityTherm system is manufactured with gas-tight facings and a profiled HIPS outer skin, forming a drainage plane that helps manage wind-driven rain by directing moisture to the outer leaf.
Typical dimensions: 1200mm x 450mm (system dependent). Thermal performance varies by construction, with 125mm system builds achieving U-values as low as approximately 0.16 W/m²K (dependent on wall build-up).
The system is designed as part of a continuous insulation solution and works in conjunction with standard CavityTherm boards and accessory components.
Key Features:
- Engineered PIR insulation with lambda value of 0.021 W/mK
- Profiled HIPS outer skin forming a drainage plane
- Helps manage wind-driven rain by directing moisture to the outer leaf
- Engineered corner detailing to support thermal continuity
- Designed for use within a continuous insulation system
- Fully engineered jointing system for reduced thermal bridging
- Compatible with full CavityTherm accessory range
- Supports improved thermal performance and reduced heat loss
- Manufactured to EN 13165
Performance and Benefits
CavityTherm offers a continuous insulation layer that helps reduce heat loss and improve thermal efficiency in cavity wall construction.
The profiled outer facing creates a controlled drainage zone, helping manage moisture movement and improving resilience in exposed conditions.
The interlocking and engineered jointing system helps reduce thermal bridging at junctions and supports consistent insulation continuity across the wall build-up.
The system supports low-energy building standards where full system design and detailing allow.
Typical Physical Characteristics:
- Core material: Rigid Polyisocyanurate (PIR)
- Density: approx. 30 kg/m³
- Thermal Conductivity (λ): 0.021 W/mK
- Compressive Strength: >100 kPa @ 10% deformation
- Service Temperature: -20°C to +100°C
- Manufactured in accordance with EN 13165
The system incorporates a profiled drainage channel and engineered jointing detail designed to help maintain a residual cavity path for moisture management and improved wall performance.
Frequently Asked Questions:
What is CavityTherm?
CavityTherm is a high-performance PIR-based cavity wall insulation system with a lambda value of 0.021 W/mK. It combines insulation boards with a profiled HIPS outer skin to provide a drainage plane and improved thermal continuity.
What is the benefit of using CavityTherm?
It improves thermal performance by reducing heat loss through cavity walls while supporting continuous insulation and improved detailing at junctions to minimise thermal bridging.
What wall ties do I use with CavityTherm?
Standard stainless steel wall ties can be used in accordance with structural design requirements. Tie type and spacing should always follow structural engineer and project specification guidance.
Why are wall ties sloped?
Wall ties are typically sloped to the outer leaf to help prevent moisture tracking along the tie into the inner leaf of the wall construction.
What building types can use CavityTherm?
CavityTherm is suitable for new external masonry cavity wall construction, subject to design and regulatory approval, including both domestic and commercial applications.
What are accessory pieces for?
Accessory components are used to maintain insulation continuity and reduce thermal bridging around complex details such as corners, openings, and service penetrations.
How do you detail around cavities, vents, or meter boxes?
Unilin provides system-compatible accessory solutions to help maintain insulation continuity and reduce thermal bridging at detailed junctions.
What is the benefit of the engineered edge detail?
The engineered jointing system helps improve continuity of insulation and reduces the risk of thermal bridging at board junctions when installed correctly.
When a board is cut, what should be used at the joint?
Joint sealing should be carried out in accordance with manufacturer installation guidance using appropriate system-approved tapes or sealing methods depending on location and application.
What is a cavity board?
A cavity board is used during construction to protect insulation from mortar droppings and maintain a clean cavity during installation.
Delivery Information:
Note:
Delivery of this bulky product is available nationwide and may be subject to a bulk delivery charge.
Delivery charges are calculated at checkout based on delivery address.
For larger volume orders, improved delivery rates may be available.
For assistance, call 0818 888 000 to discuss pricing and delivery options.
