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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PIR Insulation
High-performance, energy efficient, structural building system

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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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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


PIR Insulation
Xtratherm UniSIPS is the ideal product when considering structural insulation solutions for wall, floor and roof panels. Technically advanced and thermally efficient, the load bearing panels provide a lightweight and economical solution to facilitate modern methods of construction.


PIR Insulation


Partial Fill Cavity Wall

Applications:Wall / Partial


Thin-R Partial Fill Cavity Wall Plus XT/CWP (T&G) builds to a system thanks to it's engineered tongue and grooved joints and pre-formed corners, ensuring insulation continuity and minimisation of thermal bridging.

XT/CWP (T&G) is the best solution when building traditional masonry walls to the highest thermal standards whilst maintaining a residual cavity, offering excellent protection from wind driven rain. The lower Lambda of 0.021 W/mK improves U-values and meets Zero Carbon standards, proving an excellent choice for passive and low energy builds

XTCWP Corner

U-Value calculations to EN ISO:6946
XT/CWP Cavity Wall Partial Fill

Block Lambda 40mm 50mm 60mm 70mm 80mm 100 mm
0.11 0.27 0.24 0.21 0.20 0.18 0.15
0.15 0.28 0.25 0.22 0.20 0.18 0.16
0.46 - 0.27 0.24 0.22 0.20 0.17
1.13 - 0.28 0.25 0.22 0.20 0.17

U-Values achieved with additional Xtratherm XT/TL Thermal Liner

Thickness Block Lambda Original U-Value Table 1 Improved U-Value with XT/TL
60mm 0.11 0.21 0.16
70mm 0.15 0.20 0.15
80mm 0.46 0.20 0.15
100mm 1.13 0.17 0.13

* XT/TL 50mm Thermal Liner consisting of 38mm PIR and 12.5mm plasterboard on adhesive dabs

Product Downloads

Product Range

Thin-R Plus is an enhanced PIR Insulation with a Lambda Value as Low as 0.021 W/mK. It is available with engineered Jointing to provide continuity and reduce Thermal Bridging.

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Key Points

  • Improved Lambda Value of 0.021 W/mK
  • Robust Tongue & Groove Jointing
  • Corner Panels & Cavity Closers: Reduced Thermal Bridging
  • Clear Cavity Maintained
  • No Exposure Restrictions

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

Do you have any questions?

Talk to the team who can help you with your project

Our Technical Team provides technical services throughout our customer bases in Ireland & UK. Their experience and expertise has been built through our engagement and participation with the Irish construction industry for over 30 years.

Certified Technical Knowledge.

Solutions you can trust.

Call The Technical Team:
Tel +44 (0) 371 222 1055
Tel +353 (0) 46 906 6050

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