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Celotex is an industry-leading brand of insulation in the UK. They have over 90 years of experience in providing high-performance insulation. Celotex products are used in new builds, refurbishments and also as replacements for existing insulation. Saint Gobain own the rights to the brand Celotex as well as Isover. The products are manufactured in the UK across various different production sites. These sites are located in Hadleigh, Suffolk, Eggborough and Yorkshire. This allows Celotex to offer a nationwide distribution service. Get the best price on Celotex Insulation when you shop online at Trade Insulations. We are the home of top brands at trade prices.

25% OFF
Celotex PIR Insulation Board

Celotex 100mm PIR Insulation Board – GA4100 (2400mm x 1200mm x 100mm) 2.88m2

£29.99 ex VAT
14% OFF
Celotex Insulated Plasterboard

Celotex 37.5mm Insulated Plasterboard (2400mm x 1200mm x 37.5mm) – PL4025

£34.99 ex VAT
Celotex Cavity Wall Insulation Boards

Celotex CW4100 100mm Cavity Wall Board (1200mm x 450mm) – 3.24m2 pack

£46.64 ex VAT
26% OFF
Celotex PIR Insulation Board

120mm Celotex Insulation Board – XR4120 (2400mm x 1200mm x 120mm) 2.88m2

£38.39 ex VAT
29% OFF
Celotex PIR Insulation Board

50mm Celotex Insulation Board – GA4050 (2400mm x 1200mm x 50mm) 2.88m2

£17.75 ex VAT

75mm Celotex Insulation Board – GA4075 (2400mm X 1200mm X 75mm) 2.88m2

£25.80 ex VAT
15% OFF
Celotex Insulated Plasterboard

Celotex 52.5mm Insulated Plasterboard (2400mm x 1200mm x 52.5mm) – PL4040

£41.69 ex VAT
26% OFF
Celotex Insulation Board

150mm Celotex Insulation Board – XR4150 (2400mm x 1200mm x 150mm) 2.88m2

£45.75 ex VAT

70mm Celotex Insulation Board – GA4070 (2400mm x 1200mm x 70mm) 2.88m2

£25.69 ex VAT

80mm Celotex Insulation Board – GA4080 (2400mm X 1200mm X 80mm) 2.88m2

£28.99 ex VAT
10% OFF
Celotex Insulated Plasterboard

Celotex 62.5mm Insulated Plasterboard (2400mm x 1200mm x 62.5mm) – PL4050

£47.49 ex VAT

Celotex 72.5mm Insulated Plasterboard (2400mm x 1200mm x 72.5mm) – PL4060

£52.99 ex VAT

Celotex 77.5mm Insulated Plasterboard (2400mm x 1200mm x 77.5mm) – PL4065

£76.99 ex VAT
Celotex Cavity Wall Insulation Boards

Celotex CW4075 75mm Cavity Wall Insulation Board (1200mm x 450mm) – 4.32m2 pack

£47.25 ex VAT

140mm Celotex Insulation Board – XR4140 (2400mm x 1200mm x 140mm) 2.88m2

£45.99 ex VAT

Celotex 25mm PIR Insulation Board – TB4025 (2400mm x 1200mm x 25mm) 2.88m2

£12.19 ex VAT

Celotex Insulation

Celotex provides a range of safe, reliable and high-quality insulation materials that are used to insulate countless homes and buildings all over the UK. Thousands of professionals choose Celotex to create environments that save energy every day. Insulation can help buildings reduce heat loss, which minimises the need for heating the building and therefore has less strain on the planet. In addition to this, Celotex manufactures its products with zero Ozone Depletion Potential. This is because they are environmentally conscious and provide innovative ways to help prevent global warming. As an approved supplier of insulation, we can offer our best possible prices. Why pay more when you can use Trade Insulations?

Builders love using Celotex as it is easy to install and cheap without sacrificing performance. Celotex saw its first big boost in popularity after WW2 when building materials were scarce. Since then, the products have improved and the brand has grown into the powerhouse that it is today. There are not many (if any) builders or property developers who have not heard of Celotex.

Most Celotex Insulation products are easy to cut to suit the application. In addition to this, Celotex installation is simple and can be achieved in multiple ways. The method of installation depends on the product or application. The insulation board may be mechanically fixed or installed using the dot and dab method. Insulation should be installed by a professional, however, Saint Gobain do provide handy installation guides. We suggest that you wear appropriate PPE and conduct risk assessments in order to minimise any potential health and safety risks.

Celotex by Saint Gobain

Celotex is an insulation brand by Saint Gobain. They manufacture a wide range of insulation products, which are suitable for a variety of applications. You may hear people refer to “Celotex” as a product rather than a brand. More often than not, when people ask for “Celotex”, they are requesting the general purpose PIR board range. This range consists of GA4000, XR4000 and TB4000 products. GA4000 boards are multi-purpose and therefore very popular. The 100mm variation of GA4000, which has the product code GA4100 is the most sold Celotex product. In addition to this, Celotex also manufactures cavity wall boards and insulated plasterboard.

The brand constantly provides new and innovative ways to insulate homes. They are constantly adapting to provide safer and more environmentally focused products. Every product has a handy product code assigned to it, which can help you to identify or search for the product you need. Celotex is affordable and provides excellent thermal performance. In addition to this, it is easy to install and can be used in many applications.

At Trade Insulations, we believe in offering trade prices to everybody. We started the company to help make insulation more accessible to all. Get our best possible price on all Saint Gobain insulation when you shop online with us. For more details about individual products, we recommend that you visit the individual product pages. Here you can view product specifications as well as datasheets. Every product on our website already has a trade discount applied, so you can rest assured that you never pay too much for insulation again.

Who Are Saint-Gobain?

Celotex Insulation is a brand of the company Saint-Gobain. Saint-Gobain is a company that designs and creates materials and distributes products. With Saint-Gobain dating back to over 350 years, it now has 180,000 employees in over 100 countries. Saint-Gobain is everywhere when it comes to our living spaces, transportation, and buildings. It can be found in many industrial applications and provides safe and reliable products meanwhile addressing climate change and supporting sustainable construction and resource efficiency.

Saint Gobain has partnered with Volvo, a leading automotive manufacturer. This partnership ensured a fleet of Saint-Gobain's delivery vehicles that deliver Celotex products throughout the UK were updated to help save up to 1,300 tonnes of carbon emission each year.

The new vehicles use a system called high-pressure direct ignition (HPDI), which allows them to reduce carbon emissions whilst maintaining performance. Volvo’s HPDI technology uses less fuel than a gas-only spark ignition system by creating an ignition cycle. This creates up to 20% fewer emissions than a standard diesel system. LNG engines emit significantly less CO2 per mile than the diesel equivalent. The vehicles are fuelled with bio-methane-based LNG from renewable sources making.

Celotex Insulated Plasterboard


PL4000 is an innovative product, which merges PIR insulation with plasterboard. This can cut down install times as plasterboard and insulation is available in a single board. The polyisocyanurate (PIR) insulated board has a paper facing, and is laminated to a piece of 12.5mm tapered edge plasterboard. Sizes range from 25mm to 65mm. The PL4000 insulated plasterboard can be used for use in roofs as well as internal wall lining applications.

ThicknessLambda Value (W/mK)R-Value m2K/WLength (mm)Width (mm)Weight (kg/m2)
37.5mm0.022 W/mK1.20 m2K/W2400mm1200mm9.99kg/m2
52.5mm0.022 W/mK1.85 m2K/W2400mm1200mm10.46kg/m2
62.5mm0.022 W/mK2.30 m2K/W2400mm1200mm10.96kg/m2
72.5mm0.022 W/mK2.75 m2K/W2400mm1200mm11.31kg/m2
77.5mm0.022 W/mK3.00 m2K/W2400mm1200mm11.48kg/m2

The thickness shown above includes the 12.5mm plasterboard. The calculated R-Value is also including the plasterboard.

Celotex Cavity Wall Boards


CW4000 is a polyisocyanurate (PIR) insulation board with exceptional thermal performance with a low emissivity foil facing. The purpose of this cavity board is for cavity wall applications. It is one of the most popular cavity wall boards on the market. CW4000 sizes range from 40mm up to 100mm. These cavity wall boards can also be used for use in partial fill cavity wall applications. Further details such as R Value can be seen below:

ThicknessLambda Value (W/mK)R-Value m2K/WLength (mm)Width (mm)Weight (kg/m2)
50mm0.022 W/mK2.25 m2K/W1200mm450mm1.92kg/m2
60mm0.022 W/mK2.70 m2K/W1200mm450mm2.26kg/m2
75mm0.022 W/mK3.40 m2K/W1200mm450mm2.78kg/m2
85mm0.022 W/mK3.85 m2K/W1200mm450mm3.13kg/m2
100mm0.022 W/mK4.50 m2K/W1200mm450mm3.65kg/m2

Celotex Thermaclass 21

The Celotex Thermaclass Cavity Wall Board 21 is one of the newest additions to the family of Celotex products. It is designed for full fill masonry cavity wall applications. The core of the board features PIR with a low emissivity foil facing. This facing is featured on each side to improve thermal performance. This popular new product is available in different thicknesses. These are Thermaclass 90mm, 115mm and 140mm. Further details can be found below:

ThicknessLambda Value (W/mK)R-Value m2K/WLength (mm)Width (mm)Weight (kg/m2)
90mm0.021 W/mK4.25 m2K/W1190mm450mm2.80kg/m2
115mm0.021 W/mK5.45 m2K/W1190mm450mm3.55kg/m2
140mm0.021 W/mK6.65 m2K/W1190mm450mm4.30kg/m2

Celotex Multi Purpose PIR Boards


GA4000 is a multi purpose insulation board, which is made from polyisocyanurate (PIR). It boasts exceptional thermal performance and features a low emissivity foil facing. Sizes range from 50mm up to 100mm. The GA4000 range is multi-purpose, which means it can be used in walls, floors and roofs. GA4000 is the most popular Celotex PIR board range. These boards are 2400mm x 1200mm. Further details can be found in the table below:

ThicknessLambda Value (W/mK)R-Value m2K/WLength (mm)Width (mm)Weight (kg/m2)
50mm0.022 W/mK2.25 m2K/W2400mm1200mm1.92kg/m2
60mm0.022 W/mK2.25 m2K/W2400mm1200mm1.92kg/m2
70mm0.022 W/mK3.15 m2K/W2400mm1200mm2.61kg/m2
75mm0.022 W/mK3.40 m2K/W2400mm1200mm2.78kg/m2
80mm0.022 W/mK3.60 m2K/W2400mm1200mm2.96kg/m2
90mm0.022 W/mK4.05 m2K/W2400mm1200mm3.31kg/m2
100mm0.022 W/mK4.50 m2K/W2400mm1200mm4.15kg/m2


The TB4000 is a thinner variation of the GA4000 general purpose board. The major difference is that this board is a lot thinner to suit the application. Just like the GA4000, the TB4000 is made from polyisocyanurate (PIR). It also has a low emissivity foil facing. Sizes range from 20mm to 40mm. TB4000 can be used in a variety of applications. Further details can be found in the table below:

ThicknessLambda Value (W/mK)R-Value m2K/WLength (mm)Width (mm)Weight (kg/m2)
20mm0.022 W/mK0.90 m2K/W2400mm1200mm0.79kg/m2
25mm0.022 W/mK1.10 m2K/W2400mm1200mm0.95kg/m2
30mm0.022 W/mK1.35 m2K/W2400mm1200mm1.10kg/m2
40mm0.022 W/mK1.80 m2K/W2400mm1200mm1.41kg/m2

Celotex XR4000

XR4000 is a thicker variation of the TB4000 and GA4000 insulation boards. This PIR board features a low emissivity foil facing. XR4000 has excellent thermal performance and is ideal for applications that require a greater thickness. Sizes range from 110mm to 200mm. It can also be used for roof, wall, and floor applications.

ThicknessLambda Value (W/mK)R-Value m2K/WLength (mm)Width (mm)Weight (kg/m2)
110mm0.022 W/mK5.0 m2K/W2400mm1200mm4.54kg/m2
120mm0.022 W/mK5.45 m2K/W2400mm1200mm4.93kg/m2
130mm0.022 W/mK5.90 m2K/W2400mm1200mm5.32kg/m2
140mm0.022 W/mK6.35 m2K/W2400mm1200mm5.71kg/m2
150mm0.022 W/mK6.80 m2K/W2400mm1200mm6.10kg/m2
165mm0.022 W/mK7.50 m2K/W2400mm1200mm6.69kg/m2
200mm0.022 W/mK9.02 m2K/W2400mm1200mm8.06kg/m2

Insulation & The Environment

Celotex is committed to making continuous improvements with a focus on innovations to make the world a better home for us all. Below are key features regarding Celotex and its impact on the environment.

  • The UK’s built environment and the natural environment is protected by developing insulation solutions.
  • Meeting all accreditation requirements.
  • Use 0% CO2 electricity.
  • Maximise our contribution to sustainable development whilst reducing our impact on the environment.
  • Saint Gobain monitors all waste levels from all activities and drives and puts procedures in place to reduce the amount of waste produced.
  • Parts of packaging and materials used to protect products during transportation are recyclable and use recycled content. This includes a stretch wrap, cardboard banding, chipboard/wood bearers, and plastic strapping.

Celotex Accreditations & Datasheets

  • ISO 9001:2015 – quality management system criteria. All Celotex and ISOVER products are to 9001 standards.
  • ISO 14001:2015 – environmental management system criteria. All products are to ISO 14001 standard.
  • ISO 50001 – quality and environmental management standards. All products are to ISO 50001 standard.
  • The British Board of Agreement (BBA) – verify that products are compliant with the relevant Building Regulations.
  • The CE marking – is a confirmation that products are sold in the European Economic Area and meet the criteria. All products have CE approvals.
  • The European Certification Board – provides information related to their non-classification under the European regulation. The EUCEB certificate shows that mineral wool is bio-soluble and meets the standard.
  • Indoor Air Comfort Gold certification – ensures that low product emission requirements are met. The manufactured ISOVER UK structural building meet achieves Eurofins ‘Gold’ standard for indoor air quality.
  • BES – organisational governance, supply chain management, environmental and social aspects that must be met in order to ensure the responsible sourcing of construction products. Isover UK manufactured glass mineral wool insulation achieves BES 6001.

Please see below a full list of all Celotex datasheets. These datasheets feature useful information on Celotex products. We ensure that all datasheets are updated when possible. This is so we can provide the most up-to-date datasheet to reflect the Celotex products listed on our website. The Celotex datasheets have come directly from Saint Gobain, who own the rights to the Celotex brand.

Celotex TB4000 Datasheet
Celotex GA4000 Datasheet
Celotex XR4000 Datasheet
BBA Certfication – Timber Frame (Celotex PIR)
BBA Certfication – Floors (TB4000, GA4000, XR4000)
BBA Certfication – Pitched Roofs (Celotex PIR)
BBA Certfication – Dry Lining (TB4000, GA4000, XR4000)

At Trade Insulations, you will find all Celotex Insulation on our website. We always offer our best price and always go above and beyond for our customers. When you place an order, we get in contact with you to confirm your delivery on a suitable date. As an approved supplier, we are able to offer trade prices to the public.