Kingspan Kooltherm K5 external wall board is part of the Premium Kooltherm range and is a premium performance insulation board with a fibre-free rigid thermoset phenolic core. Each facing of the board is bonded to glass tissue. The blowing agent within this product has Zero Ozone Depletion Potential and Low Global Warming Potential. The board is also built without any use of CFCs and HCFCs.

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Kingspan Kooltherm Board
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Kingspan Kooltherm K5 50mm External Wall Board (1200 x 600) – 7.2m2 pack

£125.00 ex VAT
Kingspan Kooltherm Board
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Kingspan Kooltherm K5 70mm External Wall Board (1200 x 600) – 4.32m2 pack

£105.00 ex VAT
Kingspan Kooltherm Board
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Kingspan Kooltherm K5 60mm External Wall Board (1200 x 600) – 5.76m2 pack

£120.00 ex VAT

The Kingspan K5 Wall Board is 600mm by 1200mm with thicknesses between 20mm and 100mm. It provides a thermal conductivity of between 0.020W/mK and 0.023W/mK. K5 is a lightweight board which make installing, handling, and cutting he product easy. This product can be applied to new builds, extensions, and refurbishments. The K5 is extremely durable and long-lasting depending on the condition of the supporting structure.

Key Features:

  • Unaffected by air infiltration
  • Resistant to the passage of water vapour
  • Non–deleterious material
  • Square Edge
  • Resistance to Solvents, Fungi & Rodents
  • Water vapour resistant
  • Compressive strength exceeds 100kPa

By insulating your home, you can save money on your monthly energy bills. It also provides a more comfortable living or working environment with a more controlled temperature whilst keeping the heat out in the summer and the heat in during the winter. You will also be creating a more sustainable and energy efficient environment by stopping the hot air from escaping your home, this will contribute towards tackling climate change and global warming.

This board can be cut using a fine-toothed saw, this is accomplished by measuring the boards to size and making markings if necessary. Then placing the boards on a surface that allows the saw to go all the way through the board. A plank of wood or ruler can be used to hold the board in place and can also create a guide. A knife can also be used by making a cut in the board, then snapping the board, and then running the knife along the cut from the other side.

Protective clothing is recommended to prevent particles that are produced from cutting insulation boards, from being inhaled or irritating to the skin and eyes. Goggles, face masks, and gloves can also be worn to provide protection.

Kingspan Kooltherm K5 can be installed in a range of methods. These methods include:

Solid Brick Wall
102.5 mm Brick / 50 mm Cavity / 100 mm Block Wall
100 mm Dense Block* / 50 mm Cavity / 100 mm Dense Block* Wall (Original Render Removed)
100 mm Dense Block* Outer Leaf / 50 mm Cavity
100 mm Block Inner Leaf

Safety / Product Specifications:
Length: 1200mm
Width: 600mm
Thicknesses: 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm
Thermal Conductivity: Between 0.020W/mK and 0.023W/mK
Facing: Glass Tissue


  • ISO 9001: 2015
  • ISO 14001: 2015
  • ISO 45001: 2018
  • ISO 50001: 2018

How To Install External Wall Insulation

Before starting to fit the external wall insulation, a render test should be carried out to check how durable the existing render is and it is strong enough or will support the insulation materials. Providing the render is strong enough, it should then be smoothed out so that insulation can be fixed onto it. The render will need to be removed from the wall if it is not strong enough before the insulation process begins.

After the render has been smoothed out and has proved durable, pipework should be removed from the external property before installing insulation. Downpipes should also be installed temporarily to stop water running down the sides of the building. Soil pipes and waste pipes should be removed or extended away from walls to allow the building to function normally when installation takes place.

Install a layer of protective film over all window and doors to ensure they do not get damaged during the insulation application process.
Decide the height that you would like the insulation to begin. When the height has been decided a aluminium start track or carrier tray will be installed. This will provide a level starting point and can be applied to fitting beading. Please note insulation should begin a few inches or feet above ground.

After the starter track has been installed, the board can then be applied. A layer of adhesive should be applied to one side of each board and then the boards should be applied onto the wall in a staggered pattern. Insulation boards should be cut to fit around windows, doors, and other obstructions. A rasp can be used once the insulation is installed to fill of any edges of the board to ensure there is a completely flat surface.

Mechanical fixings should also be added to secure the boards to the walls. 10 fixings should be hammered in per square metre. This will secure the boards and stop them blowing off during bad weather.

Corner beads and stop beads should be installed around windows, doors, and other obstructions to ensure the insulation is fitted tightly and securely. Neat edges should be created to prevent the insulation materials meeting other materials.

Two layers of render with strengthening properties should be applied with a fibreglass mesh setting between each layer of render.

We do advise that you always consult professional EWI Installers for the best results.

Cheap Kingspan K5

At Trade Insulations, we believe that quality products do not have to come at a high cost. This is why we offer trade price Kingspan K5 to both the trade and public. We do not believe that trade pricing should be exclusive. We are a dedicated supplier of insulation, which means we can pass our bulk savings directly onto the customer – no matter the size of the order. This is the way it should be. We don't sell seconds or factory defects. At Trade Insulations, all of our products are brand new. Simply purchase online and get cheap Kingspan K5 insulation delivered directly on site or at your home.