Celotex GA4000 PIR Insulation For Floors, Walls & Roof Applications 50mm / 75mm / 80mm / 100mm

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(£19.37 Incl. VAT)
Availability: In stock
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Pricing & Availability:

Due to the nature of this product range we are unfortunately unable to routinely deliver these products to sites that are not within the locality of our branches (which is broadly Surrey, West Sussex and parts of South & West London, Kent & East Sussex). 

For pricing and availability on these products to sites that are outside of our local area please contact us directly so that we can explore the most cost effective delivery options for you.

We also stock and supply a large range of roofing materials, with thousands more being available to order directly from all the leading manufacturers. If you don't see the roofing products that you need on this site please contact us and we will try to source them for you or offer you an alternative.

We are able to offer prices tailored to your exact requirements & project: Please call us on 01737 763008 or email us for a free quotation.


Celotex GA4000 PIR Insulation For Floors, Walls & Roof Applications 50mm / 75mm / 80mm / 100mm

Designed for use throughout your building project, Celotex GA4000 is a versatile, high performance, rigid polyisocyanurate (PIR) insulation board that’s easy to handle and install.

As well as being CE-marked, Celotex GA4000 is certified by the British Board of Agrément for floors, framed walls and pitched roofs.

Manufactured in the UK, Celotex GA4000 provides reliable, long-term energy savings.

How does GA4000 perform?

The entire thickness range offers a low thermal conductivity (lambda value) of 0.022 W/mK, putting GA4000 among the best-performing widely-available insulation materials on the market.

In any of its intended applications, GA4000 can help to provide most of the thermal insulation performance - but the overall heat loss from a building element depends on all of the materials used and the way they’re installed.

Product benefits:

Celotex GA4000’s low emissivity aluminium foil facing can help achieve lower U-values when installed facing a clear air space within a construction.

GA4000 is a thermal insulation solution that can help to meet energy use and carbon dioxide emissions targets set by national building regulations. 



  • Board size: 1200mm x 2400mm
  • Thickness : 50mm /75mm / 80mm / 100mm
  • Lambda: 0.022 W/mK
  • Facer: Low emissivity composite aluminium foil
  • Manufactured using a blowing agent with zero ozone depletion potential (ODP) and low global warming potential (GWP)


  • Suitable applications include:
  • Ground floors - whether solid concrete, block and beam, or suspended timber joist & including where underfloor heating is used
  • Timber and steel framed walls - between and across the face of studs
  • Pitched roofs - between and across the face of rafters
  • Flat roofs - in ventilated cold roof constructions, installed from inside the building
  • Other retrofit and refurbishment projects - lining existing timber and masonry structures to make them more thermally efficient.