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

Pitched roof board on sloped roofs (ventilated, hybrid or warm) providing efficient U-values with minimal intrusion into valuable living space.

The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using XT/PR will reduce heat loss while also delivering good thermal bridging details.

Warm roof construction is a particularly effective way of insulating complex roofs. Insulating above - or above and between - the roof timbers ensures that the structure is kept at or near the internal environmental conditions, reducing thermal stress and condensation risk.

Related literature

The following content references this product:

Standard product features


To BS EN 13165.

Thermal conductivity (lambda value):

0.022 W/m·K.

Board size:

2400 x 1200 mm.

Edge profile:

Square edge.

NBS Specification

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

Product specification

An important note about specifying



Xtratherm UK Ltd


+44 (0)371 2221033

Product reference

Thin-R XT/PR


[25 mm]
[30 mm]
[40 mm]
[50 mm]
[60 mm]
[70 mm]
[75 mm]
[80 mm]
[90 mm]
[100 mm]

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