80mm Unilin PIR Insulation Board
2.4m x 1.2m | 2.88m² per board
FREE delivery over £500 excluding VAT
80mm Unilin PIR Insulation Board
2.4m x 1.2m | 2.88m² per board
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Discount ends 30 September 2026.
FREE delivery over £500 excluding VAT
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Product Description
Product Description
Where thinner boards in the Unilin Thin-R range are often fitted between timbers, 80mm Unilin PIR Insulation Board is more commonly laid as a continuous layer: across a concrete floor slab with a screed on top, over rafters in a warm pitched roof, or as an unbroken plane over an existing roof deck or ceiling. That continuous approach eliminates the thermal bridging that occurs through timber when insulation is fitted between joists or studs, and at a thermal resistance of 3.60 m²K/W the 80mm board contributes enough to U-value calculations that it is frequently the primary (and sometimes the only) rigid insulation layer in the build-up.
The board is a rigid polyisocyanurate (PIR) sheet measuring 2400mm x 1200mm x 80mm, covering 2.88m² per board. Declared thermal conductivity is 0.022 W/mK. The square-edged profile allows boards to be laid tightly against one another across large areas with minimal gapping, and at 80mm the board has a noticeably solid, rigid feel that holds its position on a slab or deck during installation without flexing or shifting.
On both sides of the closed-cell PIR core, low-emissivity composite aluminium foil facings are autohesively bonded during manufacture. The gas-tight seal locks in the insulating gas within the foam cells, preserving the declared thermal performance over the full service life of the building. Vapour resistance exceeds 300 MNs/gm, which helps limit moisture vapour movement through the insulation layer, though the foil facings are thermal facings and not a substitute for a separate vapour control layer where the specification requires one.
80mm Unilin PIR handles a compressive load of 150 kPa at 10% compression (to BS EN 826), making it a natural choice for ground floor constructions where the board sits beneath a sand-and-cement or liquid screed, and for underfloor heating installations where it directs warmth upward into the living space. It is equally suited to pitched roof over-rafter systems, flat roofs, timber and steel framed walls, and internal wall linings. A damp-proof membrane should be provided beneath the board in ground floor constructions. The closed-cell core will not rot, take on moisture or lose performance over time, and the board is CFC and HCFC free with zero ozone depletion potential. Score and snap or cut with a fine-toothed insulation saw, stagger the joints, tape where the specification calls for it, and follow the latest Unilin technical guidance throughout. Perimeter insulation strips are available separately. For other thicknesses, browse the full Unilin PIR range from 15mm to 150mm.
Benefits
- Commonly specified as a continuous insulation layer over floor slabs, rafters and roof decks, reducing thermal bridging through the structure
- Thermal resistance of 3.60 m²K/W from a declared thermal conductivity of 0.022 W/mK
- Compressive strength of 150 kPa at 10% compression (BS EN 826): carries screed loading, underfloor heating systems and site traffic without deformation
- Full-size 2.4m x 1.2m rigid PIR sheet covering 2.88m² per board
- Square edge for tight, gap-free joints across large continuous areas
- Low-emissivity composite aluminium foil facings on both sides, gas-tight and autohesively bonded during manufacture
- Vapour resistance exceeding 300 MNs/gm
- Closed-cell polyisocyanurate core: dimensionally stable, rot-proof and moisture-resistant for the life of the building
- Rigid enough at 80mm to hold position on a slab or deck during installation without flexing
- CFC/HCFC free with zero Ozone Depletion Potential (ODP)
Good to know
- Thickness: 80mm; board size: 2400mm x 1200mm; coverage: 2.88m² per board
- Thermal resistance (R-value): 3.60 m²K/W (manufacturer-declared)
- Compressive strength: 150 kPa at 10% compression to BS EN 826
- Vapour resistance: >300 MNs/gm
- Reaction to fire: Euroclass F to BS EN 13501-1
- Foil facings are low-emissivity thermal facings, not a vapour control layer; specify a separate VCL where the build-up requires one
- Ground floor constructions normally require a damp-proof membrane (DPM) beneath the insulation
- Stagger board joints and tape with foil tape where the specification requires airtightness
- Not waterproof despite being moisture-resistant; store under cover, off the ground, protected from the elements
- The Unilin Thin-R range runs from 15mm to 150mm
- Refer to the latest Unilin datasheet, Declaration of Performance and BBA certificate before specifying or installing
Important Notice: Please be aware that during periods of high demand, we reserve the right to provide alternative brands that meet the same specifications and quality standards as the products you originally ordered.
Certifications & Standards
Certifications & Standards
Technical Datasheets
Technical Datasheets
Product FAQs
Product FAQs
Can you stick PIR boards straight to the wall?
Do you sell Xtratherm PIR insulation?
What is PIR?
It says the that PIR insulation is suitable for walls, can I use this as a cavity wall?
How do I know what thickness of PIR insulation I need?
Hi do I calculate a U value?
Is PIR better than expanded polystyrene insulation (EPS)?
Can you paint straight onto PIR boards?
Is cutting PIR insulation messy?
If the PIR board has a foil facing do I need DPM?
Does the PIR board have writing on?
I need to cut my PIR does it have any lines to ensure a straight cut?
Are PIR boards foil faced?
What is the thermal conductivity of PIR?
Customer Information
Customer Information
Free delivery on orders over £500 ex-VAT. All orders below £500 (ex-VAT) are subject to a £50 delivery charge.
Ordering & Delivery
How do I place an order with Insulation UK?
You can place an order for delivery anytime online. If you want to collect from our distribution centre in South Yorkshire then please email us your requirements at sales@insulationuk.co.uk
and we will send a payment link and collection instructions. If you can’t see what you are looking for or need more information, then call our team on 03003 034 578 and we can sort your order from there.
How do I know what’s happening with my order and when I will receive it?
When you have placed your order, you will then receive an email confirmation, giving you an order reference number and asking you to double check everything is correct on your order such as delivery address, quantities etc. If there are any amendments to be made, then please reply to your confirmation email with any details.
Once the team has processed the order you will receive an email with a BY delivery date, this is the latest date you will receive your delivery.
Your final email will be a 24/48hr notification, on the day of the delivery if you need a more accurate ETA then contact the office on 03003 034 578.
Do you offer next-day delivery?
Yes, we do on certain lines, you will see our next day delivery products marked as NEXT DAY. Order before 12pm for next day delivery (charges will apply)
How much does delivery cost and how long will it take?
Standard delivery is £50 + VAT for all orders below £500 excluding VAT, above £500 excluding VAT delivery is free. Bespoke deliveries can be made but will incur charges. Each product page gives you an estimate delivery by date. For more accurate information call the team on 03003 034 578
Can I choose a specific delivery date or time slot?
We will endeavour to try and accommodate a preferred date, if you need a delivery on a certain day, then please call us on 03003 034 578.
Do you deliver nationwide?
We deliver across most of the UK; however, some postcodes are restricted due to their location. Check out our delivery map for more information. If you find that you are in area we don’t deliver to, we have access to a wide range of haulage options, please call the team on 03003 034 578 to discuss your requirements further.
Will the driver help unload the insulation products?
Most of our deliveries are made with vehicles with mechanical off-load (known as a moffett or fork-lift), the driver will leave them in a safe place of your choice. They will help as much as they are allowed but are not insured to bring anything into a property.
What happens if my order arrives damaged or incomplete?
In the unlikely event your order arrives damaged, then please contact within 48 hours at sales@insulationuk.co.uk with any images of the damage and the team will be in touch. If there is anything missing, then notify the team within 48 hours on 03003 034 578
What if my order doesn’t arrive and I have paid for trades to be on site, can I claim anything towards the costs I have incurred?
We advise not to have trades booked in and around the day of your delivery. Things can happen beyond our control, and your delivery may be delayed or abandoned. We cannot be held liable for any consequential loss such as tradesman wages etc.
Product Advice & Support
How do I know which insulation product is right for my project?
With such a variety of insulation products, we fully understand making sure you have the right one can seem daunting. Our team have over 50 years of experience in the construction industry and there isn’t a question they haven’t been asked! Speak to our technical team on 03003 034 578 and they will be happy to offer some help and guidance.
Do you offer technical advice or support before I buy?
Yes we do! Just call 03003 034 578 and ask for our technical team and we will be happy to support you.
Product Information & Suitability
Product descriptions on this website are provided as general guidance only and are not a substitute for the manufacturer’s Technical Data Sheet (TDS), fire classification information, and the project’s design/specification requirements. Suitability depends on the full build-up and intended use (including any requirement for encapsulation, coverings, and compliance with Building Regulations and the project fire strategy).
It is the customer’s responsibility to confirm, before ordering, that the product specification and performance are suitable for the intended application by reviewing the relevant TDS and taking professional advice where required. If you are unsure, contact us before purchase and provide your intended build-up so we can confirm what information we can support.
Nothing in this notice limits or excludes your statutory rights
Can I speak to someone to confirm product specifications?
Of course you can! There is also a range of data sheets and guides available on the product pages under Technical Information.
Are your products suitable for both DIY and trade customers?
Yes, they are. If you are new to DIY projects involving insulation,
then we advise to always do your research. We have a handy guides section which may help.
Do you offer fire-rated or eco-friendly insulation options?
Yes, we do. Fire ratings are indicated in the specification table on the product page, and our sustainable range is continually growing.
Pricing & Payments
Do you offer trade or bulk-buy discounts?
We always aim to offer the best price online; however we do offer project pricing for larger orders, speak to our sales team with your requirements on 03003 034 578.
What payment methods do you accept?
We accept all major cards including American Express, as well as Apple Pay, Google Pay and PayPal
Can I set up a trade account with credit terms?
We do offer trade accounts, however there are certain criteria we ask for, and any credit account application is subject to credit checks. Call the team on 03003 034 578 to discuss any credit applications.
Do your prices include VAT?
The website has a toggle at the top right of the page so the prices can be displayed including and excluding VAT. VAT, where applicable, is charged at checkout.
Returns & Cancellations
Can I return unwanted insulation products?
Contact the team via email sales@insulationuk.co.uk with the items you wish to return and any other information. Please note if we you need us to collect any unwanted items,
a collection fee will apply.
How do I arrange a return or exchange?
Contact the team via email sales@insulationuk.co.uk or check out our refund policy.
Are there any restocking fees?
Restocking charges will apply in certain instances, please contact the team via email at sales@insulationuk.co.uk check out our refund policy.
What if I’ve ordered incorrectly or need to cancel my order?
Contact the team via email as soon as possible. The best way to get in contact is to reply to any of the emails we have sent you, they will come straight through to the team and will have any relevant order information already on there.
Installation & Compliance
Do you offer installation services or just supply materials?
We do not offer any installation services; we are a supplier of insulation and building materials.
Can I get a datasheet or certificate of performance for your products?
Yes, data sheets can be found in the Technical Information drop down on the product page.
How should I store insulation products before installation?
There are a variety of insulation products each with their own storage instructions. Generally, please keep them off the ground, in a dry area, away from the elements.
Sustainability & Quality
Are your insulation products environmentally friendly?
This depends on the individual products, data sheets are available,
and any environmental benefits are noted on the product pages.
Do your products help reduce energy bills?
The correct insulation properly installed can reduce heat loss from a building and therefore help reduce energy costs.
Are your products made in the UK or imported?
With such a wide variety of products some are made in the UK and some are imported.
Customer Service & Support
How can I contact your support team?
By phone on 03003 034 578, email sales@insulationuk.co.uk or via our
webchat online
What are your opening hours?
Monday to Friday 8am to 5pm for sales and technical support, orders can be placed on line 24/7
How quickly can I expect a reply to my enquiry?
We aim to respond to our customers as quickly as possible.
Customer Reviews
Customer Reviews
Technical Details
- Brand:
- Unilin Xtratherm
- Material:
- Polyisocyanurate
- Manufacturers Part Number:
- XT/PR_UF/080/BD
- Length:
- 2400 mm
- Width:
- 1200 mm
- Thickness:
- 80 mm
- Unit Coverage:
- 2.88 m²
- Weight Per Item:
- 7 kg
- Edge Type:
- Square
Thermal performance helps show how effectively the product reduces heat transfer.
Thermal conductivity measures how readily heat passes through the material, so lower figures generally indicate better insulating performance.
R Value shows the material’s thermal resistance at that thickness, so higher figures generally mean stronger insulation performance.
These figures relate to the insulation product itself and should be considered alongside the full wall, roof or floor build-up when checking project requirements.
- Thermal Conductivity:
- 0.022 W/mK
- R Value:
- 3.60 M²K/W
Compressive strength shows how well a product resists being squashed under pressure.
The figure is measured in kPa, which stands for kilopascals.
A higher kPa number means stronger resistance to compression. For example, 120 kPa offers more compression resistance than 70 kPa, but less than 150 kPa, 200 kPa or 300 kPa.
This does not mean the product can carry that load on its own. It should always be checked as part of the full floor, wall, roof or system build-up.
- Compressive Strength:
- 140 kPa
Euroclass reaction to fire is the European EN 13501-1 classification used to show how a construction product behaves when exposed to fire.
The main scale runs from A1 and A2 at the highest end, through B, C, D and E, down to F.
A1 is non-combustible and A2 is limited combustibility, while lower classes indicate a greater contribution to fire.
Euroclass F is the lowest rating on this scale and indicates the weakest reaction-to-fire performance.
This is different from fire resistance, which relates to how long a complete wall, floor or roof build-up can resist fire.
- Reaction to Fire:
- Euro F
