Celotex TB4000 PIR Insulation Board 2400 × 1200mm – 40mm (now Sopratherm TB4040, 2.88m² sheet)
Celotex TB4000 PIR Insulation Board 2400 × 1200mm – 40mm (now Sopratherm TB4040, 2.88m² sheet)In stock
Minimum order £400 ex VAT, free delivery in England · Mainland Wales & Scotland: minimum order £400 ex VAT + £40 + VAT delivery
Delivery timing depends on stock and location; contact us before ordering if your project has a deadline. Full delivery rules
Spread the cost: pay in 3 with Klarna, PayPal or Shop Pay at checkout Subject to status.
Bulk orders? Call 03330 908479 or contact us for a bulk quote.
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Other thicknesses (same range, each thickness is its own product)
Compare other PIR brands at 40mm
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How many do I need?
This product covers 2.88m² per sheet, as shown in the product title. Enter the area you need to cover.
For a full take-off, try the insulation calculator, or check a build-up with the PIR U-value calculator.
Delivery
Minimum Celotex order £400 ex VAT, free delivery in England · Mainland Wales & Scotland: minimum order £400 ex VAT + £40 + VAT delivery · Full delivery rules
- Free delivery in England
- Minimum Celotex order £400 ex VAT. Celotex is delivered separately, so other items don’t count towards it.
- Mainland Wales & Scotland: £400 ex VAT minimum plus £40 + VAT delivery (Scottish islands not covered).
Minimum order applies: add £400.00 ex VAT of these items to reach the £400 ex VAT minimum order.
Delivery timing depends on stock and location; contact us before ordering if your project has a deadline. Full delivery details · Urgent courier quote (extra charge) · 03330 908479
Technical datasheet (PDF) – opens the manufacturer's document in a new tab
BBA certificate (PDF) – 25/7318 – opens the BBA Agrément Certificate in a new tab
Safety data sheet (PDF) – opens the manufacturer's safety data sheet in a new tab
- Genuine manufacturer stock
- Trade pricing, shown ex VAT
- Call 03330 908479 for bulk quotes
Need a quote for a bigger job?
For larger quantities or a full project list, call us, send a message or chat on WhatsApp. We will come back with a quote.
Celotex TB4040 (40mm) is now made and sold as Sopratherm TB4040. Soprema bought Celotex from Saint-Gobain and rebranded the range, so the Celotex TB4000 boards you know are now Sopratherm TB4000 (sometimes searched for as Sopretherm or Supertherm). It is a thin PIR board for tackling thermal bridging at window and door reveals, for insulated dry lining and for overlaying existing insulation. 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 40mm, a thermal resistance of 1.80 m²K/W according to Soprema's datasheet. Priced per 2400 × 1200mm sheet (2.88m²).
Specifications
| Brand | Celotex (now Sopratherm, made by Soprema) |
|---|---|
| Range | Celotex TB4000 / Sopratherm TB4000 |
| Product code | TB4040 |
| Thickness | 40mm |
| 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) | 1.80 m²K/W |
| Compressive strength | CS(10\Y)120 (≥120 kPa) |
| Reaction to fire | Euroclass F |
| Product standard | BS EN 13165 |
| BBA certificates | 25/7318 and 25/7329 |
| Manufacturer pack | 10 boards |
| Sold as | Per sheet |
Delivery
£400 ex VAT minimum with free delivery in England. Also available to mainland Wales and mainland Scotland for £40 ex VAT on every order.
Downloads & technical information
- Sopratherm TB4000 technical datasheet (PDF)
- Sopratherm TB4000 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 TB4000 product page (manufacturer website)
See the full range of Celotex insulation boards (now Sopratherm).
FAQs
Is this the same as Celotex TB4000?
Yes. Celotex TB4000 has been renamed Sopratherm TB4000 following Soprema's purchase of Celotex. The 40mm board is code TB4040, 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?
Celotex orders: minimum order £400 ex VAT, with free delivery in England. Celotex is delivered separately from our other products, so other items don’t count towards these amounts. We deliver this product in England under our usual England delivery rules. We can also deliver it to mainland Wales and mainland Scotland for £40 ex VAT on every order. We do not deliver to Northern Ireland or the Scottish 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.
| BBA Agrément Certificate | 25/7318 |
|---|
Thickness & R-value table – this product: R 1.80 m²K/W
Thickness & R-value table – this product: R 1.80 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 this product | 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 | 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 information
Delivery information
Minimum order £400 ex VAT. Free delivery in England. Mainland Wales and Scotland: £400 ex VAT minimum plus £40 + VAT delivery.
Insulation, plasterboard, drylining, ceilings, timber, aggregates and cement. Separately delivered ranges have separate minimums. Access panels and Evolution fixings have their own delivery rules.
Delivery timing depends on stock and location; contact us before ordering if your project has a deadline.
