Full Fill Built-in Insulation System Continuous wall insulation system that delivers ultimate thermal performance with the added assurance of protection from wind driven rain.

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The Xi products have been developed to deliver the U-value requirements to meet Passive standards. It’s no longer just about U-values: how the system builds, how it interconnects at junctions and how it is witnessed and confirmed on site, are all equally important facets.

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Xtratherm offer an extensive range of technically enhanced rigid insulation products for commercial and industrial projects

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Tapered Roofing System
The XtraFall system provides a high performance precision solution to thermal insulation and water drainage on at roofs.

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The Xtratherm range of high performance insulation boards provides the ideal technically advanced solution for flat roof projects.

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PLATINUM SERVICE for Developers

PLATINUM SERVICE for Developers

Developers and their design and certifcation team can rely on the expertise and professional support of the whole Xtratherm Team - it is not just about buying insulation products.

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PLATINUM SERVICE for Self Builders

PLATINUM SERVICE for Self Builders

Our Platinum Service offers full technical support and advice, helping you to achieve a cost effective, passive standard new home.

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Full Fill Built-in Insulation System

Continuous wall insulation system that delivers ultimate thermal performance with the added assurance of protection from wind driven rain.

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High Performance rigid extruded polystryrene

Xtratherm offers a cost effective solution for builders and specifiers for the closing of cavities around window and door openings, preventing cold bridging, damp penetration, air infiltration and condensation.

CavityTherm Accessories

Xi Academy Logo

At Xtratherm Xi Academy we understand the importance of giving our customers the best technical advice. The Xi Academy is open to everyone from Builders and Architects to Secondary Education Pupils to learn about advanced building methods, insulation and sustainability.

PIR Insulation

CT/PIR Flex

Applications: Wall / Full

CT/PIR Flex

CavityTherm Flex is the perfect solution when insulating fair faced inner block walls or when block is laid flat resulting in an uneven surface to accept the insulation. The 25mm fibre layer absorbs any variations due to block tolerances, providing a continuous unbroken bond between insulation layer and block. Passive level U-Values as low as 0.12 W/m²K with excellent thermal bridging detailing in cavities less than 150mm wide.

CavityTherm Flex (Inner block 215)

Block Type 120mm150mm
Light 0.150.140.12
Med 0.330.160.13
Dense 1.150.170.14

CavityTherm Flex (Inner Block 100)

Block Type120mm150mm
Light 0.150.160.13
Med 0.330.170.14
Dense 1.150.170.14

Property & Units

Water Vapour Resistivity>100 (MNs/gm)
Thermal Conductivity0.021 (W/mK)
Service Temperature -20 to +100 (°C)

CavityTherm Flex

Length (mm)1200
Width450
Thickness (mm)120150
Typical R-Value *5.196.62
*PIR+Fibre

Product Downloads

Product Range

CavityTherm provides a ‘system’ that delivers on U-values, is practical, and with a full range of innovative detailing accessories – it delivers on continuity.

Key Points

  • Engineered HIPs facer provides wind driven rain protection
  • Moisture redirected to outer surface
  • Flexible backing to eliminate indentations
  • Prepositioned slots for sloping wall ties
  • Fully engineered jointing
  • Full range of accessory pieces build continuous system
  • Excellent Thermal Bridging Values

Xtratherm reserves the right to change this information without notice.
Xtratherm accepts no responsibility for errors or omissions on the website.

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