Buy Celotex & Kingspan PIR Insulation Online
Insulation Warehouse Direct sells Celotex (now Sopratherm) and Kingspan insulation boards online at trade prices, delivered across England. This guide sets out which board in each range does which job, the thicknesses we stock and the manufacturer performance figures, so you can order the right board first time. Browse the full Celotex range, the Kingspan range or all PIR insulation boards.
Quick answer
- General-purpose PIR for roofs, floors and walls: Celotex GA4000 or Kingspan Thermapitch TP10.
- Thin board for reveals, overlays and dry lining: Celotex TB4000.
- Thick single-layer board: Celotex XR4000 (120mm and 150mm).
- Insulate and line a wall in one go: Celotex PL4000 insulated plasterboard.
- Partial-fill cavity walls: Kingspan Thermawall TW50.
- Flat roofs: Kingspan Thermaroof TR24, TR26 and TR27.
Celotex (Sopratherm) PIR boards
Soprema bought Celotex and the range is now sold as Sopratherm, with the same product codes. GA4000, TB4000 and XR4000 boards have a PIR core with low-emissivity composite foil facings on both sides, a declared thermal conductivity of 0.022 W/mK and come as 2400 × 1200mm sheets (2.88m²), according to Soprema's datasheets.
| Board | Use | Thicknesses we stock | Example R-value |
|---|---|---|---|
| Celotex GA4000 | Pitched roofs, floors, internal and external walls | 50, 60, 70, 75, 80, 90 and 100mm | 50mm: 2.25 m²K/W; 100mm: 4.50 m²K/W |
| Celotex TB4000 | Thermal bridging at reveals, dry lining, overlaying existing insulation | 20, 25, 30 and 40mm | 25mm: 1.10 m²K/W |
| Celotex XR4000 | Roofs, floors and walls needing a low U-value from one layer | 120 and 150mm | 150mm: 6.80 m²K/W |
Celotex PL4000 insulated plasterboard
PL4000 is PIR insulation bonded to 12.5mm tapered-edge plasterboard, for dry lining walls on dabs and mechanical fixings or on studs. We stock 37.5mm, 52.5mm, 62.5mm and 77.5mm total thicknesses. The 62.5mm board (50mm PIR + 12.5mm plasterboard) has an R-value of 2.30 m²K/W and is Euroclass B-s1,d0, according to Soprema. For fitting, see how to install insulated plasterboard.
Kingspan PIR boards
Kingspan Thermapitch TP10
TP10 is a PIR board with composite foil facings for pitched roofs, floors and walls, with a declared thermal conductivity of 0.022 W/mK, sold per 2400 × 1200mm sheet. At 50mm the R-value is 2.25 m²K/W and at 100mm it is 4.50 m²K/W, according to Kingspan. Thicknesses include 25mm, 50mm, 90mm, 100mm and 150mm.
Kingspan Thermawall TW50 cavity board
TW50 is a PIR board for partial-fill masonry cavity walls, in 1200 × 450mm boards. The 100mm TW50 has a declared thermal conductivity of 0.022 W/mK and an R-value of 4.50 m²K/W, according to Kingspan. See all cavity wall insulation.
Kingspan Thermaroof flat roof boards
For flat roofs we stock Kingspan Thermaroof TR24, TR26 and TR27 PIR boards, for example TR26 100mm and TR27 100mm. Check the Kingspan datasheet linked on each product page for the waterproofing system each board suits.
Kingspan Kooltherm (phenolic)
Where space is tight, Kingspan's Kooltherm range uses a phenolic core rather than PIR. The Kooltherm K106 90mm full-fill cavity board, for example, has a declared thermal conductivity of 0.019 W/mK and an R-value of 4.70 m²K/W, according to Kingspan.
Celotex GA4000 or Kingspan TP10?
On the manufacturers' figures the two general-purpose boards match: both are 2400 × 1200mm PIR sheets with foil facings, 0.022 W/mK, Euroclass F, and the same R-value at the same thickness (2.25 m²K/W at 50mm, 4.50 m²K/W at 100mm). The choice usually comes down to the thickness you need, the rest of your order and delivery. Read our Kingspan TP10 vs Celotex GA4000 comparison for the detail.
Delivery
We have a £400 ex VAT minimum, with free delivery in England. British Gypsum (including Gypframe), Celotex and Knauf can also go to mainland Wales and mainland Scotland (£400 ex VAT minimum plus £40 + VAT delivery). Access panels can also go to mainland Wales and mainland Scotland, with their own charges (£15 + VAT under £300 ex VAT, free from £300). Other ranges, including suspended ceiling tiles and grid, are delivered in England only. We do not deliver to Northern Ireland or the Scottish islands.
- Celotex (Sopratherm): minimum order £400 ex VAT, with free delivery in England.
- Kingspan and other PIR boards: free delivery, minimum order £400 ex VAT.
Need help choosing or working out quantities? Call us on 03330 908479.