Celotex XR4150 Insulation Board 150mm x 1200mm x 2400mm

£52.91 £44.09
In stock
Product Description

Celotex XR4150 is an easy-to-install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. It can be considered for roof, wall and floor applications.

Size: 150mm x 1200mm x 2400mm

Other available thicknesses: 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 75mm, 80mm, 90mm, 100mm & 120mm



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 XR4150? 

Celotex XR4150 is a high-performance thermal insulation board featuring a low emissivity foil facing which can be used for roof, floor, wall and timber joists. With a low thermal conductivity of just 0.022 W/m.K, you can achieve low U-values with only a single layer of insulation. Celotex XR4150 is economical, easy to use, durable, and sturdy, meaning it won't lose potency after time and you can save on energy bills long-term.


These insulation boards are manufactured using a blowing agent with low global warming impact and zero ozone depletion potential. BBA (British Board of Agreement) has certificated the Celotex XR4150 as fit for use in solid roof, wall, and floor applications.

Features and benefits of Celotex XR4150: 

  • Excellent thermal performance with a thermal conductivity of 0.022 W/m.K, reducing the thickness of insulation required to hit the target U-value.
  • Low emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value.
  • Easy to install – Celotex boards are light and rigid assisting with ease of transportation, handling, and fitting.
  • BBA certified – Celotex XR4000 has been assessed by the BBA as fit for use in defined roof, wall, and floor applications if installed, used, and maintained as set out in the certificate.
  • Celotex XR4000 achieves a BRE Green Guide Rating of A, which can assist in demonstrating environmental performance in your BREEAM assessments.
  • Lightweight 2400 x 1200mm boards.
  • Low emissivity foil facing.

Applications for Celotex XR4150 insulation boards: 

  • Ground floor - concrete slab
  • Ground floor - suspended timber joist
  • Ground floor - beam and block
  • Upgrading existing concrete slab floor
  • External wall - timber frame sheathing
  • External wall - between timber frame studs
  • Pitched roof - over timber rafters
  • Pitched roof - sarking
  • Pitched roof - between timber rafters
  • Pitched roof - loft insulation - between and over timber joists
  • Flat roof - balconies and terraces over timber joists
  • Flat roof - between timber joists

Read more with our Celotex buyer’s guide

Data Sheet (200.50 kB)
Customer Questions
Is there any difference between other brands of boards and Celotex, my normal supplier has offered me Recticel as they dont have any Celotex in stock? I need 150mm boards
Recticel is the same material as Celotex (PIR - Polyisocyanurate). Ecotherm and Kingspan TP10 & TF70 are also made of this material. PIR has a higher thermal performance than mineral based insulation products, as you would require only half the thickness with PIR boards. These boards have the same performance as their alternative, and can be used in the same applications.
What's the best tool to cut Celotex XR4150 boards?
Celotex boards can be cut with a coarse handsaw. They have handy cutting squares on them to ensure a straight cut.
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More Information
Supplier Part NumberXR4150
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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