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Celotex GA4000 PIR Insulation Board 2400 × 1200mm – 100mm (now Sopratherm GA4100, 2.88m² sheet)

Buy Celotex in Cardiff: PIR Boards Delivered Across the City and South Wales

By , Managing Director

Insulation Warehouse Direct delivers Celotex PIR insulation boards (now being rebranded as Sopratherm) to Cardiff and across south Wales. From Victorian terraces in Roath and Canton to new-build extensions in the Vale of Glamorgan, you can order Celotex online at trade prices and have it delivered to your site.

Delivery to Cardiff: the key facts

  • Minimum order: £400 ex VAT for Celotex (Sopratherm) orders.
  • Delivery charge: £40 + VAT (£48 inc VAT) on every order to mainland Wales. There is no free-delivery threshold for Wales orders.
  • Delivery date: we confirm the delivery date when your order is placed. We do not offer next-day delivery.
  • Coverage: We deliver to mainland Wales. If your site is on an island, call us before ordering to check. We do not deliver to the Scottish islands or Northern Ireland.
  • Prices: trade prices online, shown ex VAT, with VAT added at checkout.

Enter your postcode in the delivery postcode box at the top of our website, and the site will show you just the products we can deliver to you.

Where we deliver around Cardiff

We deliver to CF postcodes across the city, including Roath, Canton, Cathays, Llandaff and Cardiff Bay, and out across south Wales:

  • Penarth, Barry and the Vale of Glamorgan
  • Caerphilly, Pontypridd and the Rhondda
  • Bridgend, Merthyr Tydfil and the valleys
  • Newport and Monmouthshire to the east (see our Newport guide below)

Typical Cardiff projects and which Celotex boards to use

Terraced houses: loft conversions

Cardiff has a lot of Victorian and Edwardian terraced housing, and loft conversions are a popular way to add space. GA4000 boards between and under the rafters are a common choice, and the full-size boards are 2400 × 1200mm (2.88m²) with a declared thermal conductivity of 0.022 W/mK.

Rear and side-return extensions

Kitchen extensions on terraces usually need floor insulation and a warm flat roof:

See our warm flat roof PIR guide for typical build-ups.

Solid walls and rented-house refurbs

Older terraces may have solid walls, and landlords refurbishing student lets and rental homes often want to improve them from the inside. Insulated plasterboard does it in one board:

Read how to fit insulated plasterboard to a solid wall before you start.

Prices are the live website prices at the time of writing (10 November 2026), per sheet, ex VAT. Prices can change, so check the product page for the current price. Celotex boards are being rebranded as Sopratherm, so you will see both names on our product pages.

Getting your Cardiff delivery right

  • Tell us about parking and access. Terraced streets are often lined with parked cars and some have permit zones. Let us know when you order, and arrange any parking suspension you need with the council.
  • Plan storage. Terraces rarely have much space at the front, so think about where full-size boards will go and keep them flat and dry.
  • Someone must be there to receive the delivery, and we need a contact number for the driver.

Frequently asked questions

How much is delivery to Cardiff?

£40 + VAT (£48 inc VAT) on every Celotex order to mainland Wales, with a £400 ex VAT minimum. There is no free-delivery threshold for Wales orders.

Is delivery to Wales free over a certain amount?

No. Unlike orders in England, which get free delivery over the £400 ex VAT minimum, every mainland Wales order has the £40 + VAT delivery charge.

How quickly can you deliver in Cardiff?

We confirm the delivery date when your order is placed. We do not offer next-day delivery.

Do Welsh Building Regulations differ from England?

Wales sets its own Building Regulations, including the energy efficiency rules. Check your build-up with your local authority building control team or approved inspector.

How to order Celotex for Cardiff

  1. Enter your Cardiff postcode in the delivery postcode box at the top of the site.
  2. Add the Celotex (Sopratherm) boards you need from our Celotex range, making sure the order is at least £400 ex VAT.
  3. Enter your mainland Wales delivery address at checkout. Delivery of £40 + VAT is added, and we confirm your delivery date once the order is placed.

Need a quantity check or a quote for a bigger job? Call 03330 908479 (Mon–Thu 8am–5pm, Fri 8am–12pm), email sales@insulationwarehousedirect.co.uk or contact us.

Further east? See Celotex delivered to Newport. Further west? See Celotex delivered to Swansea.

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