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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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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Developers and their design and certification 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

detailing accessories

PIR Insulation


Partial Fill Cavity Wall

Applications:Wall / Partial


XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain.

Xtratherm also supply cavity closers suitable for use for Cavity Wall. Click here for more information.

XTCW Block

U-Value calculations to EN ISO:6946
XT/CW (T&G) Cavity Wall Partial Fill

Block Lambda 40mm 50mm 60mm 70mm 80mm 100mm
0.11 0.28 0.25 0.22 0.20 0.19 0.16
0.15 - 0.26 0.23 0.21 0.19 0.16
0.46 - 0.28 0.25 0.22 0.20 0.17
1.13 - - 0.26 0.23 0.21 0.18

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 0.22 0.16
70mm 0.15 0.21 0.15
80mm 0.46 0.20 0.15
100mm 1.13 0.18 0.13

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

Product Downloads

Product Range

Xtratherm Thin-R range is a high performance foil faced Polyisocyanurate (PIR) insulation with a certified thermal conductivity as Low as 0.022 W/mK. Thin-R is also available with engineered jointing to provide improved continuity and thermal bridging performance.

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Key Points

  • Robust Tongue & Groove Jointing
  • Corner Panels & Cavity Closers: Reduced Thermal Bridging
  • Clear Cavity Maintained
  • No Exposure Restrictions
  • Low Emissivity Foil Facings

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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