Home > Companies > Xtratherm UK Ltd > Thin-R XT/Walk-R

Loft decking board, composite of high performance polyisocyanurate (PIR) insulation with tough oriented-strand board (OSB) board that provides safe access into insulated roof spaces.

XT/Walk-R maintains very high insulation values and complies with health and safety guidelines.

Whether building new or upgrading, due consideration towards the energy efficiency of a home can have many benefits, including reduced energy costs and improved living conditions. But how do you allow safe access to this space, water tanks, services and fittings? XT/Walk-R allows safe access to the roof space, water tanks, services and fittings as well as improved insulation of the attic space.

Related literature

The following content references this product:

Standard product features


Insulation to BS EN 13165.

Board size:

1200 x 600 mm.


  • PIR insulation: 75 mm.
  • Oriented strand board (OSB): 11 mm.

Thermal conductivity (lambda value):

Insulation: 0.022 W/m·K.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/430 Polyisocyanurate (PIR) foam board

NBS Specification

NBS Buliding logo
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

Thin-R XT/Walk-R

Edge profile

[Straight edge]
[Tongue and groove]

Manufacturer details

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