Celotex XR4000 PIR Insulation Board 2400 × 1200mm – 120mm (now Sopratherm XR4120, 2.88m² sheet)
Celotex XR4000 PIR Insulation Board 2400 × 1200mm – 120mm (now Sopratherm XR4120, 2.88m² sheet)
Couldn't load pickup availability
- Genuine manufacturer stock
- Trade pricing, shown ex VAT
- Call 03330 908479 for bulk quotes
Celotex XR4120 (120mm) is now made and sold as Sopratherm XR4120. Soprema bought Celotex from Saint-Gobain and rebranded the range, so the Celotex XR4000 boards you know are now Sopratherm XR4000 (sometimes searched for as Sopretherm or Supertherm). It is a thicker PIR board for pitched roofs, floors and walls where you need a low U-value from a single layer. The board has a PIR foam core with low-emissivity composite foil facings on both sides, a declared thermal conductivity of 0.022 W/mK and, at 120mm, a thermal resistance of 5.45 m²K/W according to Soprema's datasheet. Priced per 2400 × 1200mm sheet (2.88m²).
Specifications
| Brand | Celotex (now Sopratherm, made by Soprema) |
|---|---|
| Range | Celotex XR4000 / Sopratherm XR4000 |
| Product code | XR4120 |
| Thickness | 120mm |
| Board size (L × W) | 2400 × 1200mm |
| Coverage per sheet | 2.88m² |
| Material | PIR core, low-emissivity composite foil facings |
| Thermal conductivity (λ) | 0.022 W/mK |
| Thermal resistance (R-value) | 5.45 m²K/W |
| Compressive strength | CS(10\Y)140 (≥140 kPa) |
| Reaction to fire | Euroclass F |
| Product standard | BS EN 13165 |
| BBA certificates | 25/7318 and 25/7329 |
| Manufacturer pack | 2 boards |
| Sold as | Per sheet |
Delivery
Free delivery to England & Wales on every order; minimum order £400 + VAT. Delivered by Moffett lorry (forklift offload); someone must be present to receive it.
Downloads & technical information
- Sopratherm XR4000 technical datasheet (PDF)
- Sopratherm XR4000 Declaration of Performance (PDF)
- BBA certificate – Sopratherm TB4000, GA4000 and XR4000 for floor insulation (PDF)
- BBA certificate – Sopratherm TB4000, GA4000 and XR4000 for dry lining (PDF)
- BBA certificate – Sopratherm TB4000, GA4000 and XR4000 for pitched roof insulation (PDF)
- Sopratherm XR4000 product page (manufacturer website)
FAQs
Is this the same as Celotex XR4000?
Yes. Celotex XR4000 has been renamed Sopratherm XR4000 following Soprema's purchase of Celotex. The 120mm board is code XR4120, and the declared performance (λ 0.022 W/mK) is the same. You may receive boards printed with either name during the changeover.
What does the price cover?
The price shown is ex VAT and is for one 2400 × 1200mm sheet (2.88m²).
How many sheets do I need?
Use our insulation calculator, or divide the area (m²) by 2.88 and round up, allowing around 10% extra for cutting and waste.
What are the delivery charges?
Free delivery to England & Wales on every order; minimum order £400 + VAT. Delivered by Moffett lorry (forklift offload); someone must be present to receive it. We deliver to England and Wales only; we cannot deliver to Scotland, Northern Ireland or the islands.
Where can I find U-values and installation guidance?
See the Soprema datasheet and BBA certificates linked above, try our PIR U-value calculator, or call us on 03330 908479.
Thickness & R-value table – this product: R 5.45 m²K/W
Thickness & R-value table – this product: R 5.45 m²K/W
Celotex / Sopratherm PIR Insulation Board (TB4000, GA4000, XR4000) – all 13 thicknesses we stock.
| Thickness | λ (W/mK) | R-value (m²K/W) |
|---|---|---|
| 20mm | 0.022 | 0.90 |
| 25mm | 0.022 | 1.10 |
| 30mm | 0.022 | 1.35 |
| 40mm | 0.022 | 1.80 |
| 50mm | 0.022 | 2.25 |
| 60mm | 0.022 | 2.70 |
| 70mm | 0.022 | 3.15 |
| 75mm | 0.022 | 3.40 |
| 80mm | 0.022 | 3.60 |
| 90mm | 0.022 | 4.05 |
| 100mm | 0.022 | 4.50 |
| 120mm this product | 0.022 | 5.45 |
| 150mm | 0.022 | 6.80 |
R-value = thickness (m) ÷ thermal conductivity λ, using the λ declared for each product, rounded down to the nearest 0.05 m²K/W. Always check the manufacturer's declaration of performance and your U-value calculation for Building Regulations.
Delivery
Delivery
Free delivery on orders over £350 ex VAT.
Insulation and building materials: free delivery on every order, minimum order £400 ex VAT. Suspended ceilings (grid, tiles and wire): minimum order £150 ex VAT, £35 ex VAT delivery under £350 ex VAT, free from £350 ex VAT.
We deliver to England and Wales only (not Scotland or Northern Ireland). Delivery timing depends on stock and location; contact us before ordering if your project has a deadline.
Deliveries arrive on a Moffett lorry (truck-mounted forklift) and are offloaded at your site. Someone must be present to receive the delivery, and we need a contact phone number for the driver.
