Celotex CW4050 Cavity Wall Insulation Board 50mm x 450mm x 1200mm 5.94m2

£72.16 £60.13
In stock
Product Description

Celotex CW4050 50mm is an easy-to-install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 40mm to 100mm, it can be considered for use in partial fill cavity wall applications.

Board size: Width 450mm, Length 1200mm

Pack: 11 boards

Other available thicknesses: 75mm & 100mm


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 CW4050 50mm? 
Celotex CW4050 Cavity Wall 50mm improves the energy efficiency of your building and reduces your energy bills. This insulation board is closed-cell, offering weather-tight protection as well as water-repellant properties that prevent moisture from affecting its performance.

This thermal insulation is used in the application of partial fill cavity wall insulation, offering low thermal conductivity of 0.022 W/mK. This product has been manufactured through a blend of blowing agents with low global warming potential (GWP) and zero ozone depletion potential (ODP). It has been awarded a BRE Green Guide Rating of A for sustainability.

Features and benefits of Celotex CW4050 50mm: 

  • 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 – the boards are light and rigid assisting with ease of transportation, handling, and fitting. They are sized to fit standard wall tie spacing for ease of installation.
  • BBA certified – it has been assessed by the BBA as fit for use in defined partial fill cavity wall applications if installed, used, and maintained as set out in the certificate.
  • BRE Green Guide Rating of A, which can assist in demonstrating environmental performance in your BREEAM assessments.
  • Board size: Width 450mm, Length 1200mm.
  • Thickness: 40-100mm.
  • Material: PIR.
  • Low global warming potential (GWP) and zero ozone depletion potential (ODP).

Applications for Celotex CW4050 cavity insulation boards 50mm: 

  • External Walls – partial fill cavity wall

Learn about the brand as well as other insulation products with our Celotex buyer’s guide

Data Sheet (613.82 kB)
Customer Questions
How much does the CW4000 50mm cover?
The Celotex CW4050 50mm boards are 1200mm x 450mm, 0.54m2. We sell these in a pack of 11 which covers 5.94m2.
What is the best way to cut the Celotex boards?
The Cavity Celotex insulation is easy to cut with a standard insulation saw or sharp knife.
Is the CW4050 intended for full fill cavity as well as partial fill cavity?
Celotex CW4050 has been assessed for partial fill masonry cavity wall applications only.
Did you find what you were looking for?
More Information
Supplier Part NumberCW4050
Pack Size11
Size1200mm x 450mm

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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