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.

> Find out more
right image

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.

> Find out more
right image

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

> Find out more
right image

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

> Find out more
right image

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

> Find out more
right image

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.

> Find out more
right image

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.

> Find out more
right image
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.

> Visit cavitytherm.ie

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

XT/CW (T&G)

Applications: Wall / Partial

XT/CW (T&G)

Thin-R Partial Fill Cavity Wall XT/CW (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/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.

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

Block Lambda40mm50mm60mm70mm80mm100mm
0.110.280.250.220.200.190.16
0.15-0.260.230.210.190.16
0.46-0.280.250.220.200.17
1.13--0.260.230.210.18

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

ThicknessBlock LambdaOriginal U-Value Table 1Improved U-Value with XT/TL
60mm0.110.220.16
70mm0.150.210.15
80mm0.460.200.15
100mm1.130.180.13

*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.

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.

Request a callback

All the members of our technical team are individually BBA accredited to help you reach your low energy goals. Fill out your details below to request a call back: