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A multi-purpose insulation board developed to provide simple solutions for overcoming localized thermal bridges as well as providing the ideal second layer solution for two-layer installations such as between and under rafter and joists and between and over studs.

Range features:

  • Is suitable for use in a number of applications including roof, wall and floor systems.
  • Is specifically designed to help eliminate thermal bridges.
  • Is certified under BBA certificate numbers 17/5405 and 16/5352.
  • Includes low emissivity foil facings giving effective thermal insulation performance within cavity air spaces.

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:

≥ 120 kPa.

Dimensional stability to BS EN 1604:

DS (70,90)3 - DS(-20,-)1.

Surface spread of flame to BS 476-7:

Class 1.

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

Euroclass E.

Thermal conductivity to BS EN 12667:

0.022 W/mK.


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

Product specification

An important note about specifying





+44 (0)1473 822093

Product reference

Celotex TB4000


12 mm thick, R-value 0.50 m²K/W. Weight 0.55 kg/m².
20 mm thick, R-value 0.90 m²K/W. Weight 0.79 kg/m².
25 mm thick, R-value 1.10 m²K/W. Weight 0.95 kg/m².
30 mm thick, R-value 1.35 m²K/W. Weight 1.10 kg/m².
40 mm thick, R-value 1.80 m²K/W. Weight 1.41 kg/m².

Manufacturer details

Lady Lane Industrial Estate,
Suffolk, IP7 6BA
Tel +44 (0)1473 822093
Fax +44 (0)1473 820880
NBS Plus
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