Unilin CavityTherm Internal Corner 150mm PIR Insulation

Key features:

  • High-performance PIR insulation
  • Internal corner solution – 150mm thickness with 2.16 m² total coverage per pack
  • Suitable for tradespeople and DIY installation
  • Designed for use in full-fill cavity wall construction

Minimum Order Quantity: 5 packs

€84.76 €68.91
Bulky Product
Delivery in
3-5 Days
SKU
IFFCCORNINT
Brand
Unilin

Minimum Order Quantity: 5 packs

CavityTherm is a full-fill built-in cavity wall insulation system designed to deliver strong U-values, excellent thermal continuity, and practical on-site installation performance.

It is a high-performance PIR composite board with a lambda value of 0.021 W/mK, designed for full-fill cavity wall applications.

The gas-tight facings and profiled HIPS skin create a drainage plane to manage moisture within the cavity system.

Key Features
  • Engineered HIPS facer for enhanced rain and moisture management
  • Redirects moisture safely to the outer leaf
  • Prepositioned slots for sloping wall ties—improves installation accuracy
  • Fully engineered jointing for a tight, continuous insulation layer
  • Full accessory system including corners and detailing pieces
  • Reduced thermal bridging through continuous insulation design
  • High-performance PIR core for excellent thermal efficiency
  • Optimised cavity wall solution for modern masonry construction
  • Designed to help achieve very low U-values in cavity wall systems
Thermal Performance (150mm System)
  • Thermal Conductivity (λ): 0.021 W/mK (BS EN 13165)
  • Typical R-Value (150mm): 6.90
  • Coverage: Based on 1200mm × 450mm boards (0.54m² per board / 2.16m² per typical pack)
  • Indicative U-values: Can contribute to wall U-values down to approx. 0.13 W/m²K depending on build-up
Board Dimensions
  • Length: 1200mm
  • Width: 450mm
  • Thickness: 150mm
  • Material: PIR (Polyisocyanurate) rigid insulation
  • Density: 30 kg/m³
  • Compressive Strength: >100 kPa @ 10%
  • Service Temperature: -20°C to +100°C
Advanced Moisture Protection

CavityTherm’s profiled facing helps manage moisture that penetrates the external leaf by directing it back towards the outer wall surface.

The rebated edge detailing on all four sides ensures a tight interlocking fit, helping maintain thermal continuity and reducing heat loss through gaps.

Smart Design for Easy Installation

The profiled edge assists correct wall tie placement and supports consistent mortar bedding on the inner leaf.

The gas-tight facings and integrated drainage plane provide added protection against wind-driven rain within the cavity.

Energy Efficiency & Sustainability

CavityTherm is designed for high-performance cavity wall construction and can help achieve passive-level U-values when correctly specified.

Performance will vary depending on wall build-up, installation method, and site conditions.

More Information
Note:

Delivery of this bulky product is available nationwide but will be subject to a bulk delivery charge.

Delivery charges are calculated during checkout based on delivery address.

For large volume orders, better delivery rates may be available—call 0818 888 000 to discuss pricing.

Frequently Asked Questions
What is CavityTherm?

CavityTherm is a PIR insulation board system (λ = 0.021 W/mK) with gas-tight facings and a profiled HIPS outer skin to assist moisture drainage and thermal performance.

What are the benefits of using CavityTherm?

It provides high levels of thermal efficiency, reduced thermal bridging, and helps achieve very low U-values in cavity wall construction when correctly designed and installed.

What wall ties should be used?

Standard stainless steel wire wall ties are generally suitable when installed in accordance with manufacturer and structural guidance.

Why should wall ties slope downward?

Downward sloping wall ties help prevent moisture tracking across the cavity towards the inner leaf.

What thickness is this product?

This listing refers to 150mm CavityTherm boards, designed for high-performance full-fill cavity wall insulation applications.

What buildings is it suitable for?

Suitable for masonry cavity wall construction in both domestic and non-domestic buildings, subject to design and building regulations.

What accessories are available?

The system includes purpose-designed components such as corner boards and detailing pieces to maintain insulation continuity and reduce thermal bridging.

How do I seal cut boards?
  • Remove profiled edges where required and butt boards tightly together.
  • Use appropriate sealing/taping methods on clean, dry surfaces.
  • Ensure correct installation around openings and services to maintain continuity.
What is a cavity board and why is it used?

A cavity board is used during construction to prevent mortar droppings from bridging the cavity and affecting insulation performance.

The HIPS facing also allows for easy cleaning with a damp cloth.

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