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Check out our range of insulation boards from brands such as Celotex, Kingspan, Ecotherm, and Mannok. We provide expert advice on XPS, Polystyrene, and rigid foam boards. An insulation board can be used almost anywhere in a building, whether it’s on the roof, walls, or floors. Insulation is not compromised because it is thin. Foil-backed insulation (boards faced with aluminium foil) is more likely to be found than paper or bitumen-backed insulation. Other materials, such as plasterboard, bitumen, or glass fleece may also be applied to the boards. Use the filters on our website to find the ideal board for your job. If you need assistance, feel free to get in touch with us. We are happy to help find insulation boards.

25% OFF
Celotex PIR Insulation Board

Celotex 100mm PIR Insulation Board – GA4100 (2400mm x 1200mm x 100mm) 2.88m2

£29.99 ex VAT
25% OFF
Recticel Insulation Board

100mm Recticel GP Insulation Boards (1200x2400mm) – 2.88m2

£29.99 ex VAT
Celotex Cavity Wall Insulation Boards

Celotex CW4100 100mm Cavity Wall Board (1200mm x 450mm) – 3.24m2 pack

£46.64 ex VAT
25% OFF
Kingspan TW50 Insulation Boards

100mm Kingspan TP10 Thermapitch PIR Insulation Board (2400 x 1200mm) – 2.88m2

£38.90 ex VAT
26% OFF
Celotex PIR Insulation Board

120mm Celotex Insulation Board – XR4120 (2400mm x 1200mm x 120mm) 2.88m2

£38.39 ex VAT

25mm Kingspan TP10 Thermapitch PIR Insulation Board (2400 x 1200mm) – 2.88m2

£14.99 ex VAT

25mm Recticel GP Insulation Boards (1200x2400mm) – 2.88m2

£12.19 ex VAT
29% OFF
Celotex PIR Insulation Board

50mm Celotex Insulation Board – GA4050 (2400mm x 1200mm x 50mm) 2.88m2

£17.75 ex VAT
29% OFF
Sale On Recticel Insulation

50mm Recticel GP Insulation Boards (1200x2400mm) – 2.88m2

£17.75 ex VAT
26% OFF
Recticel Insulation Board

70mm Recticel GP Insulation Boards (1200x2400mm) – 2.88m2

£25.69 ex VAT

75mm Celotex Insulation Board – GA4075 (2400mm X 1200mm X 75mm) 2.88m2

£25.80 ex VAT
22% OFF
Kingspan TW50 Insulation Boards

75mm Kingspan TP10 Thermapitch PIR Insulation Board (2400 x 1200mm) – 2.88m2

£31.90 ex VAT

Kingspan K107 50mm Pitched Roof Insulation Board (2400 x 1200mm) – 17.28m2 pack

£314.99 ex VAT
Kingspan Kooltherm

Kingspan Kooltherm K103 100mm Insulation Floorboard (2400mm x 1200mm) – 8.64m2 pack

£313.95 ex VAT

Kingspan Thermafloor Insulation Board TF70 – 100mm – 2400x1200mm – 2.88m2

£38.90 ex VAT
Eurowall By Recticel

Recticel Eurowall 100mm Cavity Wall Board (1200mm x 450mm) – 5.4m2 pack

£89.00 ex VAT

A popular type of insulation board is a rigid board of compact material (mainly polystyrene) with insulation properties that comes in sheets in a variety of thicknesses. One of our most popular rigid insulation boards is the 100mm Celotex. 100mm is a popular thickness and Celotex is a leading supplier of PIR insulation boards.

These boards are made by mixing chemicals using a blowing agent, which forms bubbles. This method creates a rigid block with low density, closed-cell insulation sheets. Gas is trapped in the cells and has a low thermal conductivity which means the insulation will provide better performance.
This product is an essential part of any construction taking place and is a very popular product. It is generally installed on roofs, walls, ceilings, and floors. When sheets of insulation are used in new builds or extensions it can be installed into the cavities or stud work when construction takes place. The boards can also be installed on the internal side of external walls and on the outside of the property. Cavity slabs can also be fitted into cold spots to stop draughts and reduce heat loss by reducing heat transfer.

Applying insulated plasterboard to a property helps to improve the energy efficiency and thermal conductivity which will save money on the energy bills of the house or commercial property.

Cheap Insulation Boards

We are the home to cheap insulation boards. Our insulation boards are priced at almost 40% off the RRP. We believe in bringing trade price to the public. We even offer express delivery.

Boards with insulation on them (boards) are called insulation boards. Polyurethane (PUR), polyisocyanurate (PIR), and polystyrene are foam plastics commonly used as rigid panel insulation, as are fibrous materials like fiberglass, or rock wool.

A foam board used for insulation, also known as rigid foam board, loft board or insulation foam board. Easy to install, foam boards provide you with extra insulation inside your home.

You can find insulation boards in a variety of different materials, sizes, and thicknesses depending on the project you're working on.

Rigid boards are compact materials with insulation properties that can be used to add energy efficiency to your roof, walls, ceilings, or floors. Celotex are known for their rigid insulation boards.

Insulation boards offer a variety of edges ensuring the best fit including:

  • Tongue and groove insulation board, Tongue and groove is a series of cut slots to provide insulation boards that have no gaps fit tightly together.
  • Tapered Edge insulation Board, the edges of these boards are thinner at the sides.
  • Shiplap Insulation Board is found on several types of insulation board and involves small grooves which allows each board to interlock securely.
  • Square Edge Insulation Board, they consist of insulation boards cut square and have no special joints or grooves.

Where can you use insulation boards?

General purpose insulation boards such as Celotex PIR Boards can be used in a variety of applications. This includes roofs, floors, ceilings and walls, which also includes inside cavities. A lot of the insulation brands we sell have their own PIR board, which can have multiple uses. Below we have provided a breakdown of every application type as well as its effectiveness.


Insulation boards are often used for insulating walls. This includes both interior walls as well as exterior walls and cavity walls. For interior walls, we recommend the use of insulated plasterboards. This will allow for a smooth finish whilst retaining thermal qualities. When it comes to exterior walls, external wall insulation boards such as the Kingspan Kooltherm K5 would be appropriate. Cavity wall insulation boards are purposely designed for the use inside walls with cavities.

A lot of modern buildings in the UK feature an inner and exterior wall. This reveals an opening that separates two walls. This is called the cavity. The cavity is where cavity wall insulation boards can be easily fitted. This type of insulation acts as a heat barrier. The cavity can be either partially filled or fully filled with insulation.

The use of insulation boards will allow you to achieve high U-values whilst making the most of the interior space. U-value measures the rate of heat transfer through a material, and lower U-values indicate better insulation performance. Using insulation boards can help maintain a comfortable interior temperature while reducing heating and cooling costs.

Insulation boards can help fill gaps in walls, providing a continuous thermal barrier. This can be especially useful in older buildings where gaps and voids may exist in the wall structure.

Insulation boards are also easy to maintain. If a board gets damage then it can often be covered or repaired to improve their thermal and air-tightness performance. This ensures that the insulation continues to function effectively.


It is common practice to install insulation boards in floor applications. When used in floors, people tend to use insulation boards with good compression strength. The use of floor insulation board can help lower energy usage and therefore reduce bills. When a floor is not insulated, the outer edges is a culprit for heat loss. This is where a large amount of heat can escape. By insulating your floor, you can help prevent this heat escaping. Floor insulation is typically installed in between the wooden joists and under the floors.

For suspended floors, the easiest way to install insulation is by applying the boards between the joists.

Pitched Roofs

According to the Energy Saving Trust, nearly 25% of all heat is lost through a roof. By installing insulation boards you can dramatically reduce this heat loss. Insulation boards can be attached to the interior side of pitched roofs as well as above the roof rafters or even between them. This insulates the loft and can help regulate temperatures. You may also hear people refer to roof insulation as cold roof or warm roof insulation. The difference between the two is that cold roof has insulation between the rafters. This makes the roof buildup thinner. Warm roof differs as it has the insulation above the substrate, which allows for a deeper construction.

Flat Roofs

Flat roof insulation boards are specialised for the application of flat roofs. This is because they tend to have better compression strength. This means they can tolerate being walked over. The use of insulation in flat roofs can help improve the thermal efficiency of a building.

How to cut insulation boards

Insulation Boards can be cut to size using a sharp knife or hand saw. They are a lightweight product which means delivery, handling, and installing insulation boards is simple and easy.
Before cutting your insulation board protective goggles and a mask is recommended as foam dust and other irritable particles can be distributed when the product is being cut. Using protective wear will prevent dust from going into your eyes or being breathed in.
Measure the space that the insulation board will be fitted into. Be aware that the measurements in older buildings may differ and not be consistent from top to bottom.
Measure the length and width against the insulation board using a ruler and make sure any inconsistent measurements are matched against the board.
Use your ruler as a guide and mark your cutting line with a marker and then double-check the lines marked using a ruler. Note that is it better to go bigger than smaller as you can always cut more away at a later stage.
Then lay the board onto a flat surface to get a more precise cut. Be careful not to scratch the flat surface with your blade.
If using a knife place a ruler along your marker line and use it to guide the knife in a straight line. Then slice along the line.
If using a fine-toothed saw place the board on the edge of a table so the excess hangs over and the saw has room to go through the board. Use your rules as a guide and hold the board in place and cut along the line.
Once the insulation is fitted a saw or knife can be run down the side of each sheet to ensure the fit is not too tight.

Do Insulation Boards affect the Environment?

The method used when making insulation boards acquires zero Ozone Depletion Potential (zero ODP) and a low global warming impact which means it is good for the environment and has no negative impacts.

Are Insulation Boards Flammable?

While some insulation board can be fire resistant, polystyrene can be highly flammable and let of thick black smoke in the event of a fire so the boards should always be properly installed and covered by plasterboards, sheet metal, bricks, or concrete to ensure your house is protected.

Are Insulation Boards Soundproof?

General Insulation can help to slightly reduce noise, but they are not soundproof however insulation with acoustic and soundproofing qualities can be found in the below links:

Knauf Insulation Acoustic Roll (2x600mm)

Isowave 23 Acoustic Wall System

Isover Acoustic Partition Roll (25mm – 100mm)

Are Insulation Boards Waterproof?

Foam boards generally do not absorb water meaning they will prevent moisture build-up in your house or commercial building however when storing Insulation Boards, they should be kept in a dry place where can’t be damaged by weather conditions.

How should Insulation Boards be stored?

Insulation boards should be stored on a flat surface, in a dry place where they can be protected by all weather conditions. If the boards do get affected by rain, ensure the product is wiped down and completely dry before installing.

Installing Insulation Boards

Insulation boards can be used in a variety of applications. We have named just a few below:

Installing Insulation Boards in Walls

Insulation board can be used to insulate inside walls. Exterior-facing rendered insulation boards are ideal for external walls.
While making the best possible use of space, you're still getting high u-values. In addition, smaller fasteners and timber studs can help reduce construction costs.

Due to the fact that insulation boards do not slump or sag over time like glass type insulation, they are more likely to perform well over the entire life of the building. A sealed board further enhances airtightness and thermal performance by eliminating the possibility of gaps appearing.

Insulating solid walls involves a lot of work since they cover brickwork. In the same way, it is advised to have a professional install the internal wall insulation.

Installing Insulation Boards in External Walls

EPS (expanded polystyrene insulation foam board) and Phenolic are two types of insulation boards that can be fitted on external walls.

Installing Insulation Boards in Pitched roofs

Pitch roofs are commonly insulated with boards. Depending on the application, it can be positioned between, over, or under the rafters. The rigid board installed on the joist level is right above the ceiling. The rigid board below the rafters is installed.
A careful analysis of the roof layout (warm or cold) is necessary to choose the most suitable installation method.
You will need to cover the boards, which are at joist level, with chipboard if you are going to walk on the boards. Weight will be evenly distributed between the boards and joists by this method.

Using boards with a foil coating on one or both sides will help reflect the heat back into the room. When you look at the rafters, the foil should point towards you to ensure that heat is reflected back into the house.

Cutting tools like a fine-toothed saw, a rigid board cutter, or even a Stanley knife will suffice. To ensure that there is no waste, verify the measurements and cut as soon as possible.

Installing Insulation Boards in Flat roofs

Due to the great compressive strength of insulation boards, they can withstand foot traffic on flat roofs. This is an important consideration for modern roofs with single-ply construction. Compression of other materials can result in water pools and leaks on the roof.

As an alternative to other forms of insulation, they can meet or exceed current requirements without taking up as much space. Easy to work with is rigid insulation. Roof applications benefit from its lightweight, easy cutting capabilities, and ease of handling. Because insulation of a flat roof is a complex process, it is recommended that you hire a professional.

Installing Insulation Boards in Floors

Energy consumption can be significantly reduced by the use of floor insulation, an area that is often overlooked. Usually, an uninsulated domestic floor does not perform well in terms of thermal efficiency. An uninsulated floor loses the most heat at its edges.
For timber floors with suspended joists, installing insulation between them is a good option. Fibrous materials are not ideal for covering the netting. The board would deteriorate, there would be a risk of sagging and the performance would suffer.
The insulation is placed below and between the floorboards and between the timber joists of the suspended timber floor. If the space below is tight and it's difficult to remove floorboards to get in, this may be more difficult than it sounds.

A few floorboards removed from the side of the room may be sufficient to allow insulation to be installed under the void underneath. A void space could be accessed this way. Newer floors may have tongue-and-groove boards. This, of course, will take more time and is not very economical if that is the case. As a result, unless you need to remove the floor for additional work, we do not recommend this method.

Installing Insulation Boards in Cavity walls

A modern building usually has two walls. With an inner and outer wall with a gap between them, the wind and rain are stopped. It is imperative to insulate cavity walls in order to prevent heat from escaping. Today, all newly constructed properties include cavity wall insulation as part of the construction process.
The vast majority of homes weren't built with adequate insulation when cavity walls were first designed because heat retention wasn't a priority. When you have an existing cavity wall, blow-in insulation is the most common method to insulate it.
If you are insulating cavity walls in a new house you have two options:

Insulating cavity walls partially

A partially filled cavity wall can effectively stop rain from penetrating. Insulation is fixed to the inner leaf to create a clear cavity.

Insulating cavity walls completely

With new technologies in insulation boards, it is now possible to insulate the full cavity with rigid insulation. A rebated edge prevents moisture from passing through. In this way, the cavity is not widened in order to maximize thermal performance.

different types of insulation boards

There are many types of cheap insulation boards available. Here are just a few types that are popular:

PIR insulation foam board

In most cases, PIR insulation foam boards can be used to insulate floors, walls, and roofs.

Polyisocyanurate Insulation Board

The thermal efficiency of Polyisocyanurate (also called Polyiso) is 50% higher than Polystyrene. It tends to be more affordable as well as more readily available.

Rigid phenolic insulation

When space is at a premium, rigid phenolic insulation is a great option.

What is Rigid phenolic Insulation?

In Phenolic insulation, there are two flexible layers sandwiching a rigid foam board. When the same thickness is used as the PIR boards, this board is more efficient and has a lower U value.
As a result of its low thickness and compliance with the Building Regulations, it is popular in low energy systems such as passive houses.
A similar size PIR board is typically more expensive.

Polystyrene boards

Boards made of polystyrene are also known as Styrofoam or Aeroboard. Nowadays they are rarely used because they are extremely flammable, which means most applications do not require them.

Extruded polystyrene (XPS)

Plastics extruded through a die are strong when compressed and can withstand heavy loads.
It is primarily used in car parks and on commercial floors, but can also be used in other areas. For example, you can find XPS on a plywood frame.

Expanded Polystyrene(EPS) Foam Insulation

Basement walls and other areas with plenty of space often have EPS insulation boards.

Order now with Trade Insulations for a stress-free process, quick delivery, and excellent customer service.