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Celotex

Celotex

(4 products)

Insulate any building with Celotex insulation boards. 

Celotex insulation boards are multi-purpose insulation boards in varying thicknesses from 20mm to 200mm; they are lightweight, robust, and incredibly easy to install for many applications including floors, walls, and roofs. 

Explore the complete range of Celotex products, GA4000, TB4000, XR4000, PL4000, and CW4000, and receive your order within 3-5 day lead time anywhere in the country. 

Browse below and receive free delivery on your order when you spend over £500.

Keep your home warm with Celotex Insulation Boards

Celotex is a leading UK insulation manufacturer and offers a variety of insulation products including high-performing PIR insulation boards used in both commercial and residential applications, including floors, walls, ceilings and roofs.

All Celotex insulation boards are high performing in overcoming heat loss and thermal bridging; most boards feature a low-emissivity foil facing, apart from PL4000, which is made by combining plasterboard and PIR insulation

They achieve the required U-value, meet all UK building regulations, are BBA-certified and have achieved at least an ‘A’ rating on the BRE Green Guide, which means they’re an eco-friendly solution.

Like most insulation boards, Celotex is fairly easy to install providing you have some DIY experience. If you're unfamiliar with the Celotex range, please see our size and application breakdown below:

CW4000 Cavity Wall Insulation Board (40mm-100mm) - Used for partially filling cavity walls in external walls

CW4000 insulation is a square-edged PIR (polyisocyanurate) insulation board specifically designed for partially filling cavity walls in external walls. 

  • Applications: External wall insulation - partial fill masonry cavity walls. BBA Approved - certificate 16/5343 (Partial Fill Cavity Walls).
  • Size: 1200mm x 450mm 
  • Thickness: 40mm - 100mm
  • R-Value: 1.8m².K/W - 4.50m².K/W
  • Thermal conductivity: 0.022W/m.K

Thermaclass Cavity Wall 21 (90mm - 140mm) - Used for full-fill cavity walls

Celotex Thermaclass Cavity Wall 21 offers better thermal performance compared to other Celotex products (0.021W/m.K). It features a tongue and groove edge profile and accommodates up to a 10mm residual cavity for convenient installation and adjustment. 

  • Applications: Used in full fill cavity walls; BBA certified – BBA approved – certificate 16/5343
  • Size: 1190mm x 450mm
  • Thickness: 90mm, 115mm, 140mm
  • R-Value: 4.25m².K/W - 6.65m².K/W
  • Thermal conductivity: 0.021W/m.K

PL4000 (37.5mm - 77.5mm) - Used for internal wall lining applications

PL4000 insulation, also known as Celotex insulated plasterboard, is a 2-in-1 time-saving solution combining a PIR insulation board with a paper-faced 12.5mm laminate tapered edge plasterboard into one sheet, ideal for internal wall lining use.

  • Applications: Internal wall lining; BBA approved – certificate 16/5357 (Plasterboard Thermal Laminate)
  • Size: 1200mm x 2400mm
  • Thickness (including 12.5mm plasterboard): 37.5mm, 52.5mm, 62.5mm, 72.5mm, 77.5mm
  • R-Value: 1.2m².K/W - 3.00m².K/W
  • Thermal conductivity: 0.022W/m.K

TB4000 (20mm - 40mm) - Used for floor, wall & pitched roof applications

Celotex TB4000 thermal break boards are designed to minimise thermal bridging. They are the thinnest in the Celotex range, with thicknesses ranging from 20mm to 40mm. In pitched roof installations, 25mm TB4000 boards are sometimes used over the top of wooden trusses to further reduce heat loss.

  • Applications: Floor, wall and roof applications; BBA certified – certificate 17/5405 (Pitched Roof, Dry Lining, Floor Insulation)
  • Size: 2400mm x 1200mm
  • Thickness: 20mm, 25mm, 30mm, 40mm
  • R-Value: 0.90m².K/W - 1.80m².K/W
  • Thermal conductivity: 0.022W/m.K

GA4000 (50mm-100mm) - General purpose PIR insulation board

Celotex GA4000 is a general-purpose PIR insulation board suitable for pitched roof, walls, dry lining and floor insulation applications. They’re the most popular Celotex board, ranging in thickness from 50mm to 100mm. For pitched roofs, GA4000 can be used in the middle of the roof floor, complementing TB4000 boards placed around the perimeter.

  • Applications: Pitched roof, dry lining and floor insulation. BBA certified – certificate 17/5405 (Pitched Roof, Dry Lining, Floor Insulation).
  • Size: 2400mm x 1200mm
  • Thickness: 50mm - 100mm
  • R-Value: 2.25m².K/W - 4.50m².K/W
  • Thermal conductivity: 0.022W/m.K

XR4000 (110mm- 165mm) - Used for floor, wall & roof applications

Celotex XR4000 is the thickest insulation from Celotex, ranging from 110mm to 165mm. They’re suitable for applications requiring a high level of insulation. For pitched roofs, GA4000 can be installed in the middle of the roof, complementing the TB4000 boards used across the face.

  • Applications: Floor, wall and roof applications; BBA certified – certificate 17/5405 (Pitched Roof, Dry Lining, Floor Insulation)
  • Size: 2400 x 1200mm
  • Thickness: 110mm, 120mm, 130mm, 140mm, 150mm, 165mm
  • R-Value: 5.00m².K/W - 9.00m².K/W
  • Thermal conductivity: 0.022W/m.K

Buy Celotex PIR Insulation Online at Affordable Prices

At National Insulation Supplies, we offer a wide range of high-quality insulation available at bulk discount rates to customers all across the UK. 

We provide bulk discount rates and free delivery on orders above £500, and with an excellent trust pilot rating, plus a secure online payment system, you can shop with confidence when ordering today. 

Need any help with your order or looking to collect? Get in touch with us now at 02030 045 451

Frequently Asked Questions

Is Celotex the best insulation?

Celotex is a top choice for insulation due to its excellent thermal efficiency, with products reflecting over 90% of radiant energy. It excels in managing heat loss, especially in high moisture environments. While it is highly effective, the best insulation depends on your specific needs, building type, and budget. For many applications, its combination of performance and durability makes it a leading option.

What is the difference between Celotex and Kingspan?

Celotex and Kingspan are leading insulation brands, but they differ in their offerings. Celotex specialises in PIR (polyisocyanurate) insulation boards, known for excellent thermal performance and moisture resistance. Kingspan, on the other hand, offers both PIR and phenolic insulation. Their Kooltherm range, made from phenolic foam, provides superior thermal performance and fire resistance, while their Therma range is similar to Celotex's PIR boards. The choice between them depends on your specific needs, such as thermal efficiency, fire safety, and budget.

Are Celotex insulation boards easy to install?

Celotex boards are lightweight and rigid, which makes it very easy to install them. Due to the size and thickness of the range, you should be able to find a Celotex board made to fit your specific measurements; if you can’t, they can be cut down using an insulation saw.

Is Celotex insulation eco-friendly?

Celotex is an eco-friendly insulation choice which has achieved at least an ‘A’ BRE Green Guide energy rating, with the PL4000 line achieving an A+ rating. It’s also made by mixing blowing agents which acquire zero ozone depletion potential (zero ODP) and a low global warming potential.

Can I order Celotex insulation in bulk?

You can! At Nationational Insulation Supplies, we offer Celotex bulk deals across the entire range so can you save money on a big project. To order in bulk, simply fill out our bulk order form and we'll take care of the rest! Alternatively, feel free to call us at 020 3004 5451 and our sales team will be happy to assist. 

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