Celotex PL4000 Insulated Plasterboard 2400 × 1200mm – 37.5mm (25mm + 12.5mm, now Sopratherm PL4025, 2.88m² sheet)
Celotex PL4000 Insulated Plasterboard 2400 × 1200mm – 37.5mm (25mm + 12.5mm, now Sopratherm PL4025, 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
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Bulk orders? Call 03330 908479 or contact us for a bulk quote.
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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 plasterboard 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
- 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 PL4025 is now made and sold as Sopratherm PL4025 (sometimes searched for as Sopretherm or Supertherm). It is an insulated plasterboard for dry lining walls: 25mm of PIR insulation bonded to 12.5mm tapered-edge plasterboard, 37.5mm in total. Fix it to masonry walls with dabs and mechanical fixings, or to timber or metal studs, then tape and joint or skim as normal. Declared thermal conductivity of the PIR core is 0.022 W/mK and the thermal resistance of the board is 1.20 m²K/W according to Soprema's datasheet. Priced per 2400 × 1200mm sheet (2.88m²).
Specifications
| Brand | Celotex (now Sopratherm, made by Soprema) |
|---|---|
| Range | Celotex PL4000 / Sopratherm PL4000 |
| Product code | PL4025 |
| Total thickness | 37.5mm |
| Make-up | 25mm PIR + 12.5mm plasterboard |
| Board size (L × W) | 2400 × 1200mm |
| Coverage per sheet | 2.88m² |
| Plasterboard edge | Tapered |
| Thermal conductivity (λ, PIR core) | 0.022 W/mK |
| Thermal resistance (R-value) | 1.20 m²K/W |
| Reaction to fire | Euroclass B-s1,d0 |
| BBA certificate | 25/7366 |
| 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 PL4000 technical datasheet (PDF)
- Sopratherm PL4000 Declaration of Performance (PDF)
- BBA certificate – Sopratherm PL4000 (PDF)
- Sopratherm PL4000 product page (manufacturer website)
See the full range of Celotex insulation boards (now Sopratherm).
FAQs
Is this the same as Celotex PL4000?
Yes. Celotex PL4000 has been renamed Sopratherm PL4000 following Soprema's purchase of Celotex. This board is code PL4025.
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 wall area (m²) by 2.88 and round up, allowing extra for openings and cutting.
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 certificate linked above, try our PIR U-value calculator, or call us on 03330 908479.
Quick answers
- What size is Celotex PL4000 Insulated Plasterboard 2400 × 1200mm – 37.5mm and how much does it cover?
- Size: 2400 × 1200mm; coverage: 2.88m²; sold as: Per sheet. Prices are shown ex VAT.
- What is Celotex PL4000 Insulated Plasterboard 2400 × 1200mm – 37.5mm used for?
- It is an insulated plasterboard for dry lining walls: 25mm of PIR insulation bonded to 12.5mm tapered-edge plasterboard, 37.5mm in total. Celotex boards are now made and sold under the Sopratherm name.
- What is the thermal and fire performance of Celotex PL4000 Insulated Plasterboard 2400 × 1200mm – 37.5mm?
- According to the manufacturer's data listed on this page: declared thermal conductivity (λ) 0.022 W/mK; thermal resistance (R-value) 1.20 m²K/W; reaction to fire Euroclass B-s1,d0.
- What does delivery cost and is there a minimum order?
- Celotex orders have a £400 ex VAT minimum with free delivery in England. Celotex is delivered separately, so other products don’t count towards the minimum. We can also deliver Celotex to mainland Wales and mainland Scotland for £40 ex VAT on every order. We do not deliver to Northern Ireland or the Scottish islands. Call 03330 908479 or email sales@insulationwarehousedirect.co.uk for help or bulk quotes.
Thickness & R-value table – this product: R 1.20 m²K/W
Thickness & R-value table – this product: R 1.20 m²K/W
Celotex PL4000 / Sopratherm PL4000 Insulated Plasterboard – all 4 thicknesses we stock.
| Thickness | λ (W/mK) | R-value (m²K/W) |
|---|---|---|
| 37.5mm (25 + 12.5) this product | 0.022 | 1.20 |
| 52.5mm (40 + 12.5) | 0.022 | 1.85 |
| 62.5mm (50 + 12.5) | 0.022 | 2.30 |
| 77.5mm (65 + 12.5) | 0.022 | 3.00 |
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.
