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50mm XO/UF Floor Insulation Board Xtratherm Xtroliner ǀ pack of 6

50mm Xtratherm XO/UF Premium PIR Insulation - Underfloor Heating
50mm XO/UF Floor Insulation Board Xtratherm Xtroliner ǀ pack of 6
  • Suitable for Underfloor Heating - UFH
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Xtratherm XO/UF equivalent to Celotex FI5000 and FF4000
Estimated delivery:
In Stock
£ 600.86
Ex VAT: £ 500.72
  • Brand: Xtratherm®
  • Model: 50mm XO/UF Underfloor
  • Dimensions: 2,400mm x 1,200mm x 50mm
  • SKU: 50mm
  • Product code: P1-1270
  • MPN: 50mm XO/UF Xtratherm Xtroliner UFH

Options available

50mm XO/UF Underfloor Heating Insulation Board Xtratherm Xtroliner is an improved performance PIR (polyisocyanurate) rigid foam floor insulation board with robust textured foil facings designed for ground supported floors, suspended floors and underfloor heating.

Xtratherm Xtroliner XO/UF is a BBA certified, enhanced performance 2400mm x 1200mm x 50mm square edge insulation board with an approved thermal conductivity (lambda value) as low as 0.021W/mK.

This lightweight and easy to install board combines high compressive strength with low thermal conductivity, providing a high performance solution for floor insulation.

The robust textured foil facings on both sides of the XO/UF board incorporate an integral vapour barrier, which helps to reduce the risk of condensation.

XO/UF has the strength and thermal properties required to reach top-level U-Values asked for in the Building Regulations of new build and refurbishment floors.

Xtratherm Xtroliner products are stable, rot proof and will remain effective for the life span of the building (depending on specification and installation).

The polyisocyanurate foam insulation boards can be readily cut using a sharp knife or fine toothed saw.

The floor in any building is an area of considerable downward heat loss when not properly insulated.

When it comes to health and safety, Xtratherm boards are chemically inert and safe to use.




Width: 1200mm

Length: 2400mm

Board Coverage: 2.88m2

Pack Coverage: 17.28m2

Profile: Square Edge

R-Value: 2.35m2K/W

Thermal Conductivity: 0.021W/mK

Reaction to Fire: Euroclass C-s2, d0

Compressive Strength: >150 (kPa)


Key points:

 · Robust textured foil.

 · BBA Certified.

 · High compressive strength >150 (kPa).

 · Perimeter strips for robust detailing.

 · Superior performance rigid PIR insulation.

 · Euroclass C-s2, d0 enhanced fire classification.

 · Suitable for underfloor heating (UFH).

 · Suitable for newbuild, retrofit and refurbishment.

 · Thermal conductivity of 0.021 W/mK.

 · Reduced thermal bridging details.

 · Reduced risk of condensation.

 · Lightweight and easy to install.

 · Integral vapour control layer.

 · Reduced insulation thickness.

 · Standard size 2400mm x 1200mm (8 x 4) boards.

 · Lower lambda values for improved U-values.


Handling, Cutting and Storage:

 · Xtratherm insulation should be stored off the ground, on a clean flat surface and must be stored under cover. 

 · The polythene wrapping is not considered adequate protection for outside exposure. 

 · Care should be taken to protect the insulation in storage and during the build process.

 · Appropriate PPE should be worn when handling insulation.


Certification and standards:

 · BBA Certification No.12/4956.

 · BS EN ISO 9001 Quality Management System.

 · BS EN ISO 14001 Environmental Management System.

 · BS EN 13165.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 


*Special Product - Non returnable cancelable.

Board covarage 17.28 m2
Compressive Strength 150 (kPa)
Length 2400mm
Material PIR (polyisocyanurate)
Pack Coverage 17.28m2
Profile Square Edge
R-Value 2.35m2K/W
Thermal Conductivity 0.021W/mK
Thickness 50mm
Width 1200mm
Fire Classification Euroclass C-s2, d0
Building Regulations Compatible
Coverage 17.28m2
Finish Robust textured foil
Shipping method Articulated Vehicle ǀ Courier
Applications Floors ǀ Underfloor Heating
BBA Certified Yes (no. 12/4956)
Vapour Control Layer Yes
Foil faced Both sides
ETA Notification Yes
Features Improved Performance ǀ Durable
Manufacturer Xtratherm Xtroliner®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
50mm Xtratherm XO/UF Premium PIR Insulation - Underfloor Heating
50mm XO/UF Floor Insulation Board Xtratherm Xtroliner ǀ pack of 6
£ 600.86