Please note - Celotex has replaced TB4000 with TB3000 range. Orders placed for TB4000 may be switched to the new product.

Celotex TB4000 Insulation Board

From  £15.64  inc VAT
From  £13.03  ex VAT
In stock
Celotex TB4000 Insulation Board
From  £15.64  inc VAT
From  £13.03  ex VAT
measure: Board
size: 1200mm X 2400mm

Need to discusss your enquiry further? Please contact our customer services team on 0330 123 1761, who will be happy to help.

array(1) { [0]=> string(131) "" } array(2) { [0]=> string(131) "" [1]=> string(190) "" }

Celotex TB4000 is a multi-purpose insulation board developed to provide simple solutions for overcoming localised thermal bridges. With low emissivity foil facings, TB4000 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-150mm.



Sheet size



1200mm x 2400mm



1200mm x 2400mm



1200mm x 2400mm



1200mm x 2400mm

With Celotex TB4000 you are specifying an insulation board that:

  • Is specifically designed to eliminate thermal bridges
  • Comes in thicknesses ranging from 12-40mm, 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

Celotex TB4000 can be specified for use in a variety of applications including:
• Pitched Roofs
• Flat Roofs
• Solid Masonry Walls
• Timber Framed & Steel Framed Systems
• Floors


Need a different size?  

12mm - 40mm  Celotex TB4000

50mm - 100mm Celotex GA4000

110mm - 150mm Celotex XR4000

Orders and Delivery

Orders and Delivery

Free deliveries on orders over £250.00 Inc VAT. For orders under £250.00 Inc VAT, a £24.00 Inc VAT delivery fee applies.

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

Returns and Refunds

In the unlikely event that you need to return an item, please contact our team on 0330 123 1885 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 25% 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 0330 123 1885 prior to placing the order.

Free delivery on orders over £250! Free delivery on orders over £250 Terms and Conditions apply

Roof Stores

For all your roofing needs

Shop now >

Power Tools 2 U

Buy Power tools online

Shop now >