If you’re thinking about fitting PIR insulation, you probably want to find out which are the best insulation boards available on the market, right?
Great news – you’ve come to the right place!
At Insulation Superstore, we’ve put together a comprehensive PIR insulation comparison chart featuring the best offers from all the leading brands on the market.
Find out their respective R-values, sizes, applications and more!
Christopher t.
Verified Buyer
5.0 star rating
28/03/25
Great prices
Review by Christopher t. on 28 Mar 2025 review stating Great prices
Great prices and fast delivery. Good communication throughout. Products all as expected.
On EcoTherm Eco-Versal PIR Insulation Board - 2.4m x 1.2m x 25mm
Colin B.
Verified Buyer
5.0 star rating
06/03/25
Celotex GA4050
Review by Colin B. on 6 Mar 2025 review stating Celotex GA4050
Came undamaged. Easy to cut and fit and used as a second layer under roof rafters
On Celotex GA4050 General Purpose PIR Insulation Board - 2400 X 1200 X 50mm
Matt L.
Verified Buyer
5.0 star rating
22/12/24
50mm celotex
Review by Matt L. on 22 Dec 2024 review stating 50mm celotex
Best price on the internet and speedy delivery
On Celotex GA4050 General Purpose PIR Insulation Board - 2400 X 1200 X 50mm
Robert M.
Verified Buyer
4.0 star rating
12/12/24
We use these board on
Review by Robert M. on 12 Dec 2024 review stating We use these board on
We use these board on the all the Yurt Decks we build to help keep the yurt warm for occupants
On Celotex GA4050 General Purpose PIR Insulation Board - 2400 X 1200 X 50mm
Peter S.
Verified Buyer
5.0 star rating
29/11/24
warm roof insulation
Review by Peter S. on 29 Nov 2024 review stating warm roof insulation
Used this for warm roof insulation, easy to use/cut, would use again.
On EcoTherm Eco-Versal PIR Insulation Board - 2.4m x 1.2m x 75mm
Jackie C.
Verified Buyer
5.0 star rating
04/10/24
Great quality great price
Review by Jackie C. on 4 Oct 2024 review stating Great quality great price
Really pleased with my order and everything arrived perfect and quickly thank you
On Celotex GA4075 General Purpose PIR Insulation Board - 2400 X 1200 X 75mm
Clive M.
Verified Buyer
5.0 star rating
18/09/24
Stud wall infill.
Review by Clive M. on 18 Sep 2024 review stating Stud wall infill.
Good quality PRI products
On Celotex XR4120 General Purpose PIR Insulation Board - 2400 X 1200 X 120mm
Michael K.
Verified Buyer
5.0 star rating
15/08/24
Home extension floor insulation.
Review by Michael K. on 15 Aug 2024 review stating Home extension floor insulation.
Great product, fast delivery & very reasonably priced.
On Celotex XR4150 General Purpose PIR Insulation Board - 2400 X 1200 X 150mm
Mal D.
Verified Buyer
5.0 star rating
31/12/23
Ticked all the boxes and
Review by Mal D. on 31 Dec 2023 review stating Ticked all the boxes and
Ticked all the boxes and used product for 25 years plus.
On Celotex GA4075 General Purpose PIR Insulation Board - 2400 X 1200 X 75mm
Mal D.
Verified Buyer
5.0 star rating
31/12/23
Ticked all the boxes and
Review by Mal D. on 31 Dec 2023 review stating Ticked all the boxes and
Ticked all the boxes and used product for 25 years plus.
On Celotex GA4075 General Purpose PIR Insulation Board - 2400 X 1200 X 75mm
Mal D.
Verified Buyer
5.0 star rating
31/12/23
Ticked all the boxes and
Review by Mal D. on 31 Dec 2023 review stating Ticked all the boxes and
Ticked all the boxes and used product for 25 years plus.
On Celotex GA4075 General Purpose PIR Insulation Board - 2400 X 1200 X 75mm
Peter J.
Verified Buyer
5.0 star rating
17/11/23
Underfloor insulation
Review by Peter J. on 17 Nov 2023 review stating Underfloor insulation
I used this product to insulate between joists under a wooden floor, in a void area that is very cold! The boards were easy to cut; I used a sharp knife to score about 15-20mm deep into the board, then snapped apart by placing a batten under the scored line and pressing gently. Boards were also easy to trim to a perfect fit, using a chisel to chamfer the edges where necessary - slow but satisfying when the board fits tightly between joists! V happy with the result and the floor is a lot warmer, holding the heat in the room.
On Celotex GA4050 General Purpose PIR Insulation Board - 2400 X 1200 X 50mm
Peter J.
Verified Buyer
5.0 star rating
17/11/23
Underfloor insulation
Review by Peter J. on 17 Nov 2023 review stating Underfloor insulation
I used this product to insulate between joists under a wooden floor, in a void area that is very cold! The boards were easy to cut; I used a sharp knife to score about 15-20mm deep into the board, then snapped apart by placing a batten under the scored line and pressing gently. Boards were also easy to trim to a perfect fit, using a chisel to chamfer the edges where necessary - slow but satisfying when the board fits tightly between joists! V happy with the result and the floor is a lot warmer, holding the heat in the room.
On Celotex GA4050 General Purpose PIR Insulation Board - 2400 X 1200 X 50mm
Ian M.
Verified Buyer
5.0 star rating
23/09/23
Great For Passivhaus STD
Review by Ian M. on 23 Sep 2023 review stating Great For Passivhaus STD
SF40 although more expensive than SF19+ gives that extra thermal R to achieve really low U values in places you can't get enough PIR in. Little bit thicker to work with than SF19+ so good staple gun required and deeper staples.
Great U Value calculator on Supafoil web site serves all my needs 👍👍
Great U Value calculator on Supafoil web site serves all my needs 👍👍
On Multi-layer Foil Insulation SF40 by SuperFOIL - 1.5m x 10m Roll
Julia B.
Verified Buyer
5.0 star rating
12/09/23
Great product
Review by Julia B. on 12 Sep 2023 review stating Great product
Looking for an insulation that didn’t pinch the space in such a small room. This was perfect solution to the walls, roof and floor when converting our garage to a studio.
Many thanks for the advise and product.
Many thanks for the advise and product.
On Kingspan Thermafloor TF70 PIR Insulation Board - 2400 x 1200 x 60mm - Pack of 5 Sheets
Julia B.
Verified Buyer
5.0 star rating
12/09/23
Great product
Review by Julia B. on 12 Sep 2023 review stating Great product
Looking for an insulation that didn’t pinch the space in such a small room. This was perfect solution to the walls, roof and floor when converting our garage to a studio.
Many thanks for the advise and product.
Many thanks for the advise and product.
On Kingspan Thermafloor TF70 PIR Insulation Board - 2400 x 1200 x 60mm - Pack of 5 Sheets
Julia B.
Verified Buyer
5.0 star rating
12/09/23
Great product
Review by Julia B. on 12 Sep 2023 review stating Great product
Looking for an insulation that didn’t pinch the space in such a small room. This was perfect solution to the walls, roof and floor when converting our garage to a studio.
Many thanks for the advise and product.
Many thanks for the advise and product.
On Kingspan Thermafloor TF70 PIR Insulation Board - 2400 x 1200 x 60mm - Pack of 5 Sheets
Julia B.
Verified Buyer
5.0 star rating
12/09/23
Great product
Review by Julia B. on 12 Sep 2023 review stating Great product
Looking for an insulation that didn’t pinch the space in such a small room. This was perfect solution to the walls, roof and floor when converting our garage to a studio.
Many thanks for the advise and product.
Many thanks for the advise and product.
On Kingspan Thermafloor TF70 PIR Insulation Board - 2400 x 1200 x 60mm - Pack of 5 Sheets
shelagh L.
Verified Buyer
5.0 star rating
26/07/23
Great product
Review by shelagh L. on 26 Jul 2023 review stating Great product
I’m really happy with the product which I expect will reduce my heating costs this winter.
On Celotex TB4040 General Purpose PIR Insulation Board - 2400 X 1200 X 40mm
Colin M.
Verified Buyer
5.0 star rating
26/06/23
Very good insulation
Review by Colin M. on 26 Jun 2023 review stating Very good insulation
This is excellent insulation, i’ve had to use 100mm in walls, 75mm subfloor and 40mm over face of walls , and it’s all good stuff. But obviously messy when you trim a little to fit in a stud frame so wear correct PPE.
On Celotex TB4040 General Purpose PIR Insulation Board - 2400 X 1200 X 40mm
David N.
Verified Buyer
5.0 star rating
04/03/23
Wooden extension
Review by David N. on 4 Mar 2023 review stating Wooden extension
Very easy to work with and over whelmed building inspector.
On Actis Hybris Panel Reflective Multifoil Insulation 140mm - 2.74m2 Pack
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![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 70mm]()
![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 75mm]()
![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 25mm]()
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krmcarpentryltd
04/02/23
Single story extension underway. Roof complete now for the internals. #krmcarpentry #chippylife🔨 #cutandpitch #handcutroofs #insulation #celotex #kingspan #pirboard #blockwork #render #extensions #kitchenextension #familyroom #carpentryuk #medwaybuilder
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krmcarpentryltd
04/02/23
Single story extension underway. Roof complete now for the internals. #krmcarpentry #chippylife🔨 #cutandpitch #handcutroofs #insulation #celotex #kingspan #pirboard #blockwork #render #extensions #kitchenextension #familyroom #carpentryuk #medwaybuilder
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Other tagged products
![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 100mm]()
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![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 75mm]()
![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 25mm]()
![Product image of Recticel Eurowall Cavity Insulation 1.2m x 450mm x 30mm - 17.28m2 Pack]()
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krmcarpentryltd
04/02/23
Single story extension underway. Roof complete now for the internals. #krmcarpentry #chippylife🔨 #cutandpitch #handcutroofs #insulation #celotex #kingspan #pirboard #blockwork #render #extensions #kitchenextension #familyroom #carpentryuk #medwaybuilder
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![Product image of Recticel Eurothane General Purpose PIR Insulation Board - 2400 X 1200 X 90mm]()
![Product image of Recticel Eurowall Cavity Insulation 1.2m x 450mm x 40mm - 12.96m2 Pack]()
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krmcarpentryltd
04/02/23
Single story extension underway. Roof complete now for the internals. #krmcarpentry #chippylife🔨 #cutandpitch #handcutroofs #insulation #celotex #kingspan #pirboard #blockwork #render #extensions #kitchenextension #familyroom #carpentryuk #medwaybuilder
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Tetyana P.
Verified Buyer
5.0 star rating
31/01/23
As described
Review by Tetyana P. on 31 Jan 2023 review stating As described
Item is just as described, easy to handle. Delivery took ages but when arrived the driver was helpful and the boards were well protected.
On Celotex PL4025 Insulated Plasterboard 2400 x 1200 x 37.5mm
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thegardenstudiosyork
12/09/20
100mm insulation being cut for the floor and roof and 75mm insulation in all walls. Need a super tight fit in between the timber frame. Insulation from insulation_superstore
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Table of contents:
What is PIR insulation?
PIR, meaning polyisocyanurate insulation boards, are rigid boards made from PIR foam which are widely used in the industry. They have excellent thermal performance, preventing the passage of heat as well as moisture.
PIR boards are also thinner than insulation boards made from other materials. So, they take up less space.
You’re probably wondering:
Just how thick should PIR insulation be?
While most PIR insulation boards come in a variety of thicknesses, some are as thin as 12mm. That’s seriously thin! At the other end of the spectrum, some offerings are 200mm thick.
The key takeaway is:
There’s a huge range of options available on the market, and there’s always something for everyone.
But wait! There’s more:
PIR rigid board insulation is extremely durable, quick and easy to install. As a result, it’s one of the most popular types of insulation with both tradesmen and DIYers alike.
UK PIR insulation comparison chart
Some of the best PIR thermal insulation board solutions currently on the market come from the likes of Celotex, Recticel, EcoTherm, IKO, Xtratherm and Kingspan.
Let’s take a closer look at their respective performances. Keep in mind that the higher the R-value of insulation the better its thermal performance.
| Range | Thickness (mm) | R-values (m²K/W) | Size (mm) | Applications |
|---|---|---|---|---|
| Celotex GA4000 | 50-100 | 2.25-4.5 | 2400 x 1200 | Floor Pitched roof Framed wall |
| Celotex TB4000 | 20-40 | 0.5-1.8 | 2400 x 1200 | Floor Pitched roof Framed wall |
| Celotex XR4000 | 110-200 | 5-9.05 | 2400 x 1200 | Floor Pitched roof Framed wall |
| Celotex CW4000 | 40-100 | 1.8-4.5 | 1200 x 450 | Cavity wall |
| EcoTherm Eco-Versal | 25-150 | 1.136- 6.818 | 2400 x 1200 | Floor Pitched roof Framed wall |
| EcoTherm Eco-Liner | 37.5-82.5 | 1.13-3.15 | 2400 x 1200 | Framed wall Pitched roof |
| EcoTherm Eco-Cavity Partial Fill | 40-100 | 1.81-4.54 | 1200 x 450 | Cavity wall |
| EcoTherm Eco-Cavity Full Film | 90-140 | 4.09-6.36 | 1200 x 460 | Cavity wall |
| IKO Enertherm ALU | 25-150 | 1.35-9.05 | 2400 x 1200 | Flat roof Pitched roof Floor Cavity wall |
| Kingspan Kooltherm K103 | 25-150 | 1.3-7.85 | 2400 x 1200 | Floor |
| Kingspan Kooltherm K107 | 25-120 | 1.3-7.85 | 2400 x 1200 | Pitched roof |
| Kingspan Kooltherm K112 | 25-120 | 1.3-7.85 | 2400 x 1200 | Framed wall |
| Kingspan Thermaroof TR24 | 25-120 | 1.1-6.65 | 1200 x 600 | Flat roof (torch on felt) |
| Kingspan Thermaroof TR26 | 120-130 | 3.15-9.5 | 2400 x 1200 | Flat roof (single ply membrane - mechanical fix) |
| Kingspan Thermaroof TR27 | 25-150 | 3.2-7.25 | 1200 x 600 | Flat roof |
| Recticel Eurothane GP | 25-150 | 1.1-7.25 | 2400 x 1200 | Floor Pitched roof Framed wall |
| Xtratherm TR/BGM | 30/50-90/110 | 0.0.24-0.027 W/mK* | 1200 x 1200 | Bitumen based partially bonded built-up roof |
| Xtratherm TR/MG | 30/50-130/150 | 0.024-0.027 W/mK* | 1200 x 1200 | Single ply fully adhered/partially bonded built-up felt roof |
* Denotes thermal conductivity, not R-value
The bottom line
And there you have it:
Some of the most popular high-performance PIR insulation boards in the UK right now.
As we promised, there’s something for pretty much any application – from floors to different types of walls to pitched and flat roofs. You can find out more about PIR alternatives in our Insulation buyer’s guide.
In the meantime:
Make sure you keep our PIR insulation comparison chart handy when choosing the right brand, range and thickness size for your particular needs, and you’ve got this covered!
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Mentioned in this product guide:
