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Celotex TB4025 General Purpose PIR Insulation Board - 2400 X 1200 X 25mm

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Product Description

Celotex TB4000 is a multi-purpose insulation board which can be specified for use in a variety of applications such as pitched roofs, flat roofs, solid masonry walls, floors, timber framed & steel framed systems. These 25mm insulation boards have been developed to provide simple solutions for overcoming localised thermal bridges.

With low emissivity foil facings, TB4000 celotex high performance insulation board (1200 x 2400mm) is manufactured from rigid polyisocyanurate (PIR) using a blend of blowing agents that have zero ozone depletion potential (zero ODP) and low global warming potential (GWP). Our 12mm product positions Celotex as the manufacturer of the broadest range of product thicknesses, from 12mm to 200mm.


Length: 2.4m.
Width: 1.2m.
Coverage: 2.88m2.
Thickness: 25mm.
rValue: 1.10m2K/W.
Weight: 0.85kg/m2.
Thermal conductivity: 0.022 W/mk - BS EN 12667.
Compressive strength: ≥120kPa - BS EN 826.
Water vapour resistance: >150MNs/g - BS EN 12086: Method B.
Spread of flame: Class 1 - BS 476-7.


The insulation shall be Celotex TB4000 comprising a polyisocyanurate rigid foam insulation core, with a thermal conductivity of 0.022W/mK and low emissivity aluminium foil facings on both sides. TB4000 is A+ rated when compared to the BRE Green Guide 2008 and is CFC/HCFC free with zero ODP and low GWP.

Celotex TB4000 can be specifed for use in a variety of applications such as pitched roofs, flat roofs, solid masonry walls, floors, timber framed & steel framed systems.

CE marking compliance to BS EN 13165:2001 and manufactured in accordance with quality management systems BS EN ISO 9001:2000 by Celotex Limited. All products must be installed in accordance with instructions issued by Celotex Limited.

TB4000 Specifications

  • Is specifically designed to eliminate thermal bridges.
  • Comes in thicknesses ranging from 12 - 45mm, making it the thinnest PIR insulation available, in a standard board size of 1200mm x 2400mm.
  • Is suitable for use in a number of applications including roof, wall and floor systems.
  • Is easy to cut and shape.
  • Includes low emissivity foil facings giving improved thermal insulation performance within cavity air spaces.
  • Provides reliable long-term energy savings for buildings.


WIDTH 1200mm LENGTH 2400mm THICKNESS 25mm


Thermal Conductivity 0.022 W/mK Facing Foil Material PIR Product Type Board
Edging Square Edge

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Questions & Answers


Hi please could you tell me if this would be suitable for a downstairs toilet and can it be fixed to the brick wall using dab adhesive? Thanks.


We wouldn't recommend foil facing boards such as Celotex to be bonded using an adhesive.


The reason why is to do with the foil facing on the boards. The foil isn't a particularly porous surface for the adhesive to bond/stick to, and as such the boards would not bond properly, and wouldn't give you a secure fit. 

If you are looking to secure Celotex boards to brick walls, we would recommend the use of mechanical fixings to secure them. 


Hi would this be suitable for insulating my shed? Thanks


This would be suitable for insulating a shed.

Not only is this product thermally efficient, it is also foil reflective - the foil layers can help retain heat during the colder months, and help reflect heat out of the shed in the warmer months, and plus the sheets are easy to cut and fit between the stud frame, or they can be fixed with screws direct to the shed wall (depending on your planned build up etc)


Can I use this product to insulate my garage ceiling


You can use this to insulate your Garage ceiling. It is perfect to go between both joists and battens, and it can even be fixed mechanically (with screws) directly to the wall if needed, or direct to joists if required.

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Product Reviews

4.5 / 5 17 reviews
Paul Wheeler
5th April 2021
Arrived in good condition and friendly driver who unloaded with no moaning which is nice for a change.
25th January 2021
Perfect for what I needed to do
Alister Fleming
8th December 2020
Great product to work with.
Robin Martin
11th October 2020
Would like to give a balanced review but only half the order arrived and after chasing the remainder for over a week I eventually cancelled the order.
Gabriel Vint
7th October 2020
does what it says on the tin.
4th October 2020
Out it in my shed what difference cool in summer warm in winter.perfect than you.
Mr Michael Scanlon
19th August 2020
Wonderful stuff. Great insulator.
30th July 2020
First class service.
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Celotex TB4025 General Purpose PIR Insulation Board - 2400 X 1200 X 25mm

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