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25mm Single Board Kingspan Kooltherm® K5 Insulation

25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
  • Single Board 25mm Kingspan Kooltherm K5 External Wall Insulation
  • 600mm x 1200mm Kooltherm K5 Thermal conductivity 0.022W/mK
  • Used for external wall thermal insulation systems, thin coat rendering
  • Perfect solution for buildings that can’t be insulated on the inside
  • The thinnest commonly used External Wall Insulation (EWI) Board
Estimated delivery:
In Stock
£ 21.44
Ex VAT: £ 17.87
  • Brand: Kingspan®
  • Model: 25mm K5 Single Board
  • Weight: 0.57kg
  • Dimensions: 1,200mm x 600mm x 25mm
  • SKU: 25mm K5 Kingspan
  • Product code: P1-2579
  • MPN: 25mm K5 Single Board

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25mm Single Board Kingspan Kooltherm® K5 Insulation is an advanced external wall insulation board for masonry walls, with a fibre-free rigid thermoset phenolic core, used for external wall insulation systems and thin coat rendering.

The K5 boards are suitable for use behind traditional and lightweight polymer modified renders and can be retrofitted externally to existing properties without disturbing the occupants as all work is done from the outside.

The thinnest commonly used External Wall Insulation (EWI), an ideal solution for retaining internal space within buildings - perfect for buildings that can’t be insulated on the inside.

Kingspan Kooltherm K5 25mm EWB is an insulating sheet faced on both sides with mineral glass coatings bonded to the insulation core during the manufacturing process and certified thermal conductivity (lambda) of 0.022W/mK.

The core of Kingspan Kooltherm K5 Board is a highly efficient thermal phenolic insulation manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Kingspan Kooltherm K5 Board for external wall insulation is compliant with Building Regulations reducing insulation thickness while delivering outstanding thermal performance.

Using Kooltherm Kingspan K5 a higher insulation value is achieved with a thinner board thickness than with other insulation materials (such as EPS, XPS and mineral wool).

Kingspan K5 Insulation Board is an easy to handle and install 1200mm x 600mm x 25mm phenolic insulation sheet.




Thickness: 25mm 

Width: 600mm

Length: 1200mm

Board Coverage: 0.72m2

Density: 35kg/m3

Weight: 0.57kg/board

Thermal Conductivity: 0.022W/mK

R-Value: 1.17m2K/W

Compressive Strength: 100kPa

Water vapour resistivity: 300MN.s/g.m

Fire Rating (Reaction to Fire): C(Class 1)


Kingspan Kooltherm K5 Features:

 · Thermal conductivity (lambda value) of 0.022 W/mK.

 · Suitable for use behind polymer modified renders.

 · Unaffected by air infiltration.

 · Resistant to the passage of water vapour.

 · Easy to handle and install.

 · Suitable for new build and renovation.

 · Non-deleterious material.

 · Manufactured with a blowing agent that has zero ODP and low GWP.

 · High resistance to mold growth.



 · External wall insulation systems:

 · Solid brick and block walls.

 · Cavity block and brick walls.

 · Thin coat rendering.

 · Cavity brick walls.

 · Cavity dense block walls.

 · Insulated render systems.

 · Steel-framed walls

 · Timber-framed walls.


Kingspan Kooltherm K5 Installation:

We recommend:

Adhesive and Base-Coat Render: EWI-225 Premium Basecoat Render Adhesive 25kg,

Rendering Mesh: Orange Fibreglass Rendering Mesh Roll,

Peiming Paint: EWI-333 Top Coat Primer,

Top Coat Thin Coat Render: EWI-075 Silicone Render.

Plastic Fixings: 70mm Insulation Panel Fixings Plastic Pin,

Metal Fixings: 70mm Insulation Panel Fixings LMX10 Metal Pin Hammer Fix,

Base Track: 25mm Aluminium Base Track | 2500mm length profile,

Render Beads and Profiles


Standards & Certification:

 · ISO 9001: 2015 (Quality management systems. Requirements).

 · ISO 14001 : 2015 (Environmental Management Systems. Requirements).

 · BS / I.S OHSAS 18001: 2007 (Occupational Health and Safety Management System Requirements) .

 · ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use).

 · Kingspan Kooltherm K5 is BBA / NSAI Agrément Certified rendered external wall insulation systems.

 · Kingspan Kooltherm K5 achieves European Classification (Euroclass) C-s2,d0 when classified to EN 13501-1: 2018.

 · Kingspan Kooltherm K5 when subjected to EN ISO 5659-2: 2012 (Plastics. Smoke generation. Part 2)


*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 0.72 m2
Colour Light shade of red
Compressive Strength 100kPa
Density 35kg/m3
Length 1200mm
Material Rigid thermoset phenolic insulation
Profile Square edge
R-Value 1.17m2K/W
Size 25mm x 600mm x 1200mm
Thermal Conductivity 0.022 W/mK
Thickness 25mm
Weight 0.57kg
Width 600mm
Fire Classification Euroclass C-s2,d0
Coverage 0.72m2 per board
Finish Mineral glass coatings
Application Temperature from +5 °C to +25 °C
Shipping method Articulated Vehicle ǀ Courier
Applications External insulation for masonry walls
BBA Certified Yes
ETA Notification Yes
Features Thinnest commonly used External Wall Insulation Board
Manufacturer Kingspan Kooltherm® K5

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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.
25mm Single Board Kingspan Kooltherm® K5 Insulation
25mm Single Board Kingspan Kooltherm® K5 Insulation
£ 21.44