Home > Companies > Celotex > Celotex XR4000

Celotex XR4000 is targeted at ‘cut-to-fit’ applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. Suitable for use in floors and walls.

Range features:

  • Is suitable for use in a number of applications including roof, wall and floor systems.
  • Provides the thickest PIR insulation available from stock within the market.
  • Is certified under BBA certificate numbers 17/5405 and 16/5352.
  • Includes low emissivity foil facings providing effective thermal insulation performance within cavity air spaces.
  • Can be used to provide reliable, long term energy savings for buildings.

Manufactured in accordance with Quality Management System ISO 9001 and Environmental Management System ISO 14001.

Standard product features

Board size:

1200 x 2400 mm.

Compressive strength to BS EN 826:

≥140 kPa.

Dimensional stability to BS EN 1604:

DS (70,90)4 - DS(-20,-)2.

Thermal conductivity to BS EN 12667:

0.022 W/mK.

Surface spread of flame (BS 476-7):

Class 1.

Reaction to fire to BS EN 13501-1:2007+A1:2009:

Euroclass E.


Foil faced both sides.

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





+44 (0)1473 822093

Product reference

Celotex XR4000


110 mm thick, R-value 5.00 m²K/W. Weight 4.54 kg/m².
120 mm thick, R-value 5.45 m²K/W. Weight 4.93 kg/m².
130 mm thick, R-value 5.90 m²K/W. Weight 5.32 kg/m².
140 mm thick, R-value 6.35 m²K/W. Weight 5.71 kg/m².
150 mm thick, R-value 6.80 m²K/W. Weight 6.10 kg/m².
165 mm thick, R-value 7.50 m²K/W. Weight 6.69 kg/m².
200 mm thick, R-value 9.05 m²K/W. Weight 8.06 kg/m².

Manufacturer details

Lady Lane Industrial Estate,
Suffolk, IP7 6BA
Tel +44 (0)1473 822093
Fax +44 (0)1473 820880
NBS Plus
Other content by this manufacturer:
Company Overview Products (5)