Celotex GA4000 Insulation Board

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Celotex GA4000 Insulation Board
Product Description

Celotex GA4000 is an easy-to-install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 50mm to 100mm, it can be considered for roofs, walls, and floor applications.

Size: 1200mm x 2400mm





size: 1200mm x 2400mm

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 GA4000? 

Celotex GA4000 insulation board has been designed for general purpose and delivers a wide range of thermal insulation solutions. The boards are polyisocyanurate meaning they are rigid and lightweight, making handling much easier. Celotex insulation products are effective in reducing heating and cooling costs and have been rated as having zero ozone depletion potential (OPD) and low global warming potential (GWP) – plus, the materials involved in the process are environmentally friendly.


Celotex GA4000 insulation boards have been scored with a class 1 fire rating, meaning they don’t catch fire easily.

Features and benefits of Celotex GA4000: 

  • 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 GA4000 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 GA4000 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 GA4000 insulation boards: 

  • Ground Floor - Concrete Slab
  • Ground Floor - Suspended Timber Joist
  • Ground Floor - Beam and Block
  • Ground Floor - Upgrading Existing Concrete Slab
  • External Wall - Timber Frame Internal Linings
  • External Wall - Timber Frame Sheathing
  • External Wall - Between Timber Frame Studs
  • External Wall - Solid Masonry Internal Linings
  • Pitched Roof - Over Timber Rafters
  • Pitched Roof - Sarking
  • Pitched Roof - Below Timber Rafters
  • Pitched Roof - Between Timber Rafters
  • Pitched Roof - Loft insulation - Between and Over Timber Joists
  • Flat Roof - Balconies & Terraces Over Joists
  • Flat Roof - Between Timber Joists
  • Flat Roof - Below Timber Joists

If you are considering using Celotex as part of your building and renovation works, please read our guide on the applications of Celotex insulation boards.

Data Sheet (213.70 kB)
Safety Data Sheet (619.33 kB)
Customer Questions
What’s the best glue to use for sticking the boards to wood?
It is best to mechanically fix the boards. This is because the adhesive will only be as strong as the foil facing. If you want to glue aswell as mechanically fix, a general purpose adhesice such as Stixall can be used.
Why is there foil on the Celotex GA4000 boards?
Celotex GA4000 boards along with TB400 and XR4000 are foil faced on both sides. These facings have a low emissivity and help reduce heat transfer, which improves thermal performance.
What sizes are available in the GA4000 range?
The Celotex GA4000 range are in sheet sizes of 2400mm by 1200mm. The GA4000 is available in 50mm, 60mm, 70mm, 75mm. 80mm, 90mm and 100mm. Other thicknesses are available in TB4000 (thinner) & XR4000 (thicker).
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More Information
SKUCelotex GA4000 Insulation Board
Supplier Part NumberGA4000

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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