Home > Companies > Xtratherm UK Ltd > XtroLiner XO/CW (T&G)

XO/CW T&G is an innovative partial fill wall insulation system incorporating robust facings, engineered jointing details, performed corners and a certified lambda of 0.021 W/mK.

This lower lambda improves U-Values and meets Zero Carbon standards, proving an excellent choice for passive and low energy builds. XO/CW (T&G) partial fill can achieve a passive U-Value of 0.15 W/m2K in a traditional cavity wall. Using XO/CW allows the residual cavity to be maintained, offering excellent protection against wind driven rain.

Standard product features


To BS EN 13165.

Board size:

1200 x 450 mm.

Thermal conductivity (lambda value):

0.021 WmK.


Xtratherm PIR achieves an A+ rating under the BRE Green Guide.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-45/400 Polyurethane (PUR and PIR) spray foam insulation

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Xtratherm UK Ltd


+44 (0)371 2221033

Product reference

XtroLiner XO/CW (T&G)


[50 mm]
[60 mm]
[75 mm]
[80 mm]
[100 mm]

Manufacturer details

Park Road,
Holmewood Enterprise Park,
Derbyshire, S42 5UY
Tel +44 (0)371 2221033
Fax +44 (0)371 2221044
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NBS National BIM Library