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75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)

75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
  • 75mm CavityTherm Unilin Insulation for full fill cavity wall applications
  • CavityTherm is an innovative built-in insulation for traditional walls
  • CavityTherm achieves passive level U-Values as low as 0.12 W/m2K
  • Made of an enhanced PIR core with thermal conductivity of 0.021W/mK
  • CavityTherm Unilin is a continuous insulation system for full fill cavities
Estimated delivery:
In Stock
£ 103.34
Ex VAT: £ 86.12
  • Brand: Unilin Insulation (UK) known as Xtratherm
  • Model: 75mm CavityTherm Unilin
  • Weight: 4.90kg
  • Dimensions: 1,200mm x 450mm x 75mm
  • SKU: 75mm CavityTherm Unilin
  • Product code: P1-3242
  • MPN: 75mm CavityTherm Unilin

Options available

75mm Unilin CavityTherm CT/PIR Insulation Board is a high performance composite board of enhanced PIR with a lambda value of 0.021 W/mK, for full fill cavity wall applications.

CavityTherm is proven to provide the most cost effective answer, not only reaching Future Homes Standard fabric U-Values but also achieving Thermal Bridging targets.

Unilin CT/PIR built into a traditional 100-150mm cavity using standard foundation widths, building skills and local materials achieves U-Values down to 0.12 W/m2K.

CavityTherm’s unique engineered profiled facing directs any moisture that might penetrate the external wall down the protective facing and back onto the external leaf.

Unilin CavityTherm CT/PIR is giving added protection from the ever increasing occurrence of wind driven rain as a result of climate change.

The board includes specifically designed rebated edge detailing on all four edges to allow the system to tightly interlock when installed.

Unilin CT/PIR CavityTherm is manufactured for 100mm, 110mm, 125mm and 150mm cavities, and achieves U-values down to 0.12 W/m²K.

By properly insulating cavity walls using cavitytherm, you will save energy and cut costs off your heating bills.




Thickness: 75mm

Size: 75mm x 450mm x 1200mm

Length: 1200mm

Width: 450mm

Board coverage: 0.54m2

Pack coverage: 2.16m2

Density (Foam Core): 30Kg/m3

Thermal Conductivity: 0.021 W/mk

R-Value: 3.57m2K/W

Commpressive Strength: >100 (kPa)

Water Vapour Resistivity: >100 MNs/gm

Surface spread of flame: Class 1

Service Temperature: -20 to +100 (°C)


What is the real benefit using Unilin CavityTherm?

 · U-Values achieved by placing CavityTherm into your standard 150mm cavity meets the Passive House standards. 

 · It’s a very practical, affordable solution to low energy design.

 · It builds as a ‘system to ensure continuity.


What thicknesses of Unilin CavityTherm are available?

 · CavityTherm is manufactured for 100mm,125mm and 150mm cavities, and achieves U-Values as low as to 0.12 W/m2K.


Unilin CavityTherm Features:

 · Engineered HIPs facer provides wind driven rain protection

 · Moisture redirected to outer surface

 · Prepositioned slots for sloping wall ties - no creep

 · Fully engineered jointing

 · Full range of accessory pieces build continuous system

 · Excellent Thermal Bridging Values



 · BBA Certification No. 10/4786.

 · BS EN ISO 9001 Quality Management System

 · BS EN ISO 14001 Environmental Management System


*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 2.16 m2
Commpressive Strength 100 (kPa)
Density 30-32 Kg/m3
Length 1200mm
Material Polyisocyanurate Rigid Foam
Profile Unique engineered profiled facing
R-Value 3.57 m2K/W
Size 75mm x 450mm x 1200mm
Surface spread of flame Class 1
Thermal Conductivity 0.021 W/mk
Thickness 75mm
Water Vapour Resistivity 100 MNs/gm
Width 450mm
Vapour Resistivity 100 MNs/gm
Finish Rebated edge detailing on all four edges
Shipping method Articulated Vehicle ǀ Courier
Applications For full fill cavity wall applications
BBA Certified Yes (No. 10/4786)
Foil faced One side (gas tight)
ETA Notification Yes
Features Continuous cavity insulation system
Manufacturer Unilin Insulation®

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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.
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
75mm CavityTherm Unilin CT/PIR Full Fill Cavity (pack of 4)
£ 103.34