Celotex TB4025 Insulation Board 25mm x 1200mm x 2400mm

£13.50 £11.25
In stock
Product Description

Celotex TB4025 is a high-performance polyisocyanurate (PIR) insulation board that can be used for multiple applications, including roofs, walls and floors. This insulation board is durable, lightweight and easy to transport and install.

Size: 25mm x 1200mm x 2400mm

Other available thicknesses: 30mm, 40mm, 50mm, 60mm, 70mm, 75mm, 80mm, 90mm, 100mm, 120mm & 150mm



We are happy to help with enquiries, stock availability or any technical help you require, however for security reasons we cannot take orders over the phone. So if you need to chat give us a call on 03301231761 or email us at [email protected].

What is Celotex TB4025? 

Featuring low emissivity foil facing, this PIR insulation board is designed to be used across multiple applications. They are durable and sustainable, available in thickness level 25mm, all the way up to 150mm. 


The PIR boards are lightweight and rigid, making transportation easy, as well as handling and fitting. 

What type of insulation is 25mm Celotex used for?

Celotex TB4025 offers a range of applications. They can be used for floor insulation, pitched and flat roof insulation, as well as external wall insulation

How effective is 25mm Celotex insulation?

These PIR boards are extremely effective when used in floor, wall and roof insulation. They have a thermal conductivity of 0.022 W/m.K, which means they have excellent thermal performance. 


Additionally, the boards also boast a BRE Green Guide Rating of A, so you can rest assured they are sustainable. 

Features and benefits of Celotex TB4025: 

  • Low emissivity foil facing, providing high thermal performance in sealed cavity air spaces. 
  • Lightweight, durable improving transportation and installation. 
  • BBA certified meaning high-quality manufacturing. 
  • Environmentally friendly with a BRE Green Guide Rating of A. 

Applications for TB4025 insulation boards: 

  • Ground Floor - Concrete Slab (perimeter upstand)
  • Ground Floor - Beam and Block (perimeter upstand)
  • Ground Floor - Suspended Timber Joists (perimeter upstand)
  • Ground Floor - Upgrading Existing Concrete Slab (perimeter upstand)
  • External Wall - Timber Frame Internal Linings
  • External Wall - Masonry Cavity Internal Linings
  • External Wall - Solid Masonry Internal Linings
  • Pitched Roof - Below Timber Rafters
  • Pitched Roof - Above Timber Rafters
  • Flat Roof - Below Timber Joists
  • Flat Roof - Balconies and Terraces

The Celotex insulation boards are Euroclass E Reaction to Fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.


For more information, please read our guide on how to use Celotex

Data Sheet (205.83 kB)
Customer Questions
Are TB4025 boards foiled on both sides?
Yes all of the TB, GA and XR4000 boards are foiled on both sides.
What is the coverage of 1 board of Celotex TB4025?
Celotex TB4025 boards are 1.2m x 2.4m, giving you a coverage of 2.88m2 per board.
Can this be laid directly on a concrete floor which will be finished with self leveling concrete for LVT panels on top?
Celotex products when used in ground floors will require the following- 1. There must always be a damp proof membrane somewhere below the Celotex within the construction                   2. There must always be a polythene separating layer directly on top of the Celotex before any floor finishes go down. If you require more information, please call Celotex on 01473 820850
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More Information
Supplier Part NumberTB4025
Size1200mm x 2400mm

Orders and Delivery

Free delivery if your order is over £300 ex VAT. Orders between £100 - £300 ex VAT will be subject to a delivery charge of £50 ex VAT. Please note, we are unable to accept orders less than £100 ex VAT

When ordering on line you can specify the date of delivery, however we would not be able to specify the time of delivery on that day.

• Please note that we have a number of large vehicles, including articulated vehicles that may be used for delivery. Please advise us in the comments on your order if access to the delivery address is limited.

• Due to insurance guidelines, delivery personnel are unable to enter private residences. Delivery will be as far as possible to the kerbside of the delivery address. The recipient of the products is responsible for any additional lifting once the delivery has been made. Please bear in mind that Insulation products can be bulky and / or heavy.

• The delivery driver will require a signature to confirm the goods have been received.

 † Unfortunately we, Insulation Express, cannot deliver to the Highlands & Islands of the UK. However we will be happy to deliver to a freight forwarding company on your behalf.


Returns and Refunds

In the unlikely event that you need to return an item, please contact our team on [email protected] within 14 days of accepting delivery of the item.

Restocking charges may apply. We will discuss this with you upon receipt of the cancellation request. Restocking charges will be applied where the products are no longer required AND NOT for goods returned because either defective or damaged.

We usually charge 30% of value (minimum £25.00).

Please note that we cannot accept returns on special orders. Special orders may consist of items sent via third party shipping companies or made to measure products. If you are unsure on whether or not your item is a special order, please contact us on [email protected] prior to placing the order.

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