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

URN: 3001022 In Stock
£57.85ex. VAT £20.09 per m2
£57.85ex. VAT
£20.09 per m2
Bulk Discount
10+ boards 20+ boards 30+ boards
£57.27ex. VAT £56.69ex. VAT £56.11ex. VAT

Celotex XR4150 is a high-performance thermal insulation PIR board with composite foil facings. It can be used for roof, floor, wall and timber joist applications.

Express Delivery

Mon 3 Apr

Standard Delivery

Tue 4 Apr

Product Overview

Celotex XR4150 is a high-performance thermal insulation PIR board with composite foil facings. It can be used for roof, floor, wall and timber joist applications.

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

URN: 3001022
£57.85ex. VAT

Delivery & Returns Information

All delivery charges are shown in your basket and are dependent on the total value of items in your basket based on product category.

Standard (Nationwide) Delivery

Insulation, Plasterboard and Drylining
Under £150 ex. VAT £75 ex. VAT
Between £150 - £300 ex. VAT £50 ex. VAT
Between £300 - £500 ex. VAT £25 ex. VAT
Over £500 ex. VAT FREE
Building Material Products
Under £300 ex. VAT £50 ex. VAT
Between £300 – £500 ex. VAT £25 ex. VAT
Over £500 ex. VAT FREE
Under £100 ex. VAT £7.50 ex. VAT
Over £100 ex. VAT FREE
SuperFOIL and YBS products
Each item £10 ex. VAT
Over £350 ex. VAT of 1 brand FREE

Express Delivery

Under £300 ex. VAT £75 ex. VAT
Over £300 ex. VAT £50 ex. VAT

This charge is based on delivery to mainland UK excluding the Scottish Highlands. If your delivery address is in the Scottish Highlands a member of our customer service team will contact you prior to processing your order should an additional delivery charge apply. We do not offer deliveries outside the UK mainland.

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We offer a 30 day returns policy on any faulty products.

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Key Features

  • Use in floors, framed walls and pitched roofs
  • Aluminium composite facing on both sides
  • 0.022 W/mK thermal conductivity
  • Easy to handle and install
  • Zero Ozone Depletion Potential (ODP)
  • BBA certified

Technical Specification

Technical Specification
Material Type:PIR
Sales Unit:Board
Sales Unit Coverage:2.88m2
Manufacturer's Reference:XR4150
Thermal Conductivity:0.022W/mK

Reduce annual heating bills whilst cutting your carbon footprint with Celotex XR4150 boards; the 'XR' of which means 'Extra Resistance'. XR4150 Celotex boards are made from an expanded Polyisocyanurate (PIR) insulation foam with a foil facing on either side, using a blend of blowing agents that have zero ozone depletion potential (zero ODP) and low global warming potential (GWP).

With a low thermal conductivity of just 0.022 W/m.K, Celotex XR4150 delivers optimum thermal performance, preventing heat loss with minimal thickness whilst meeting the current and future requirements of Building Regulations. What's more, Celotex XR4150 is certified by the BBA for use in a number of applications including roof, wall and floor systems. 

150mm Celotex XR4150 PIR Insulation Board Applications

150mm Celotex XR4150 is suitable for ‘cut-to-fit- applications between joists and rafters. This enables you to achieve lower U-values with just a single layer of insulation. Celotex XR4150 is a highly versatile multi-purpose insulation board ideal for various applications including pitched roofs, solid floors, solid masonry walls, timber frames and steel frames. The XR4150 is produced to the highest manufacturing standards and has a BBA (British Board of Agrement) certificate as fit for use in defined solid roof, wall and floor applications.

Celotex XR4150 insulation board is suitable for use in the following applications:

  • Solid concrete floors
  • Block and beam floors
  • Suspended timber joist floors
  • Pitched roofs
  • Partition wall and solid masonry wall
  • Timber framed & steel framed systems

Celotex XR4150 PIR Insulation Board Specifications

Celotex XR4150 is a polyisocyanurate PIR insulation board with an impressive thermal conductivity of just 0.022 W/mK. 150mm Celotex boards are the go-to thermal insulation solution for the eco-conscious who want to improve heat retention in their homes whilst making long term energy savings. They are manufactured with eco-friendly concepts in mind, manufactured using a blowing agent with low global warming impact and zero ODP (zero ozone depletion potential). 

Let's take a look at the specs: 

  • Thermal conductivity of 0.022 W/mK
  • Achieves U-values with minimum thickness
  • Moisture-resistant
  • Low Global Warming Potential (GWP) and Zero Ozone Depleting Potential (ODP)
  • Features low emissivity foil facings giving improved thermal insulation performance within cavity air spaces
  • Easy to cut and shape
  • Provides reliable long-term energy savings for buildings

Celotex XR4150 PIR Insulation Board Certifications

BS EN is British and European Standard Specifications. With over 100 years of experience, the British Standards Institute is recognised as the UK’s National standards body. BS EN considers Celotex XR4150:

  • Spread of flame: Euroclass E Reaction to Fire classification, according to BS EN 13501-1
  • Thermal conductivity of 0.022 W/m.K, reducing the thickness of insulation required to hit the target U-value - BS EN 12667
  • BRE Green Guide Rating of A for sustainability - which can assist in demonstrating environmental performance in your BREEAM assessments
  • BBA certified

150mm Celotex XR4150 Storage & Handling

Celotex XR4000 PIR insulation boards are lightweight and easy to handle. If you need to store 150mm Celotex boards for a while before installation, you should choose a cool, dry space. 2.4m x 1.2m insulation boards are not for external use, and therefore they should not be left outside for extended periods of time or allowed to get wet.

About Celotex

Celotex is a leading British manufacturer of 150mm PIR insulation. It was founded decades ago and has since evolved from a fibreboard insulation company to one that focuses on PIR boards. The XR4150 insulation board is just one of many popular thermal insulation solutions from Celotex XR4000 product range, with thicknesses ranging from 110mm to 150mm.

They are manufactured in accordance of quality management systems and are water vapour resistant. Celotex XR450 helps to achieve lower U-Values, energy use and carbon dioxide emissions targets set by the national building regulations.


5/5 based on 4 reviews

I used this in my roof. Easy to cut and install

Amad A on

Fantastic service. Board came on it's agreed delivery date

Hugh F on

Great PIR insulation board. Used in cavity air spaces and house is now noticeably warmer.

Stanley Cooper on

Very good at insulating

Tom Richards on

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