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Roof Insulation

Roof Insulation

Ensuring that your roof is well insulated can help you avoid extortionate utility bills. Insulation is also at the heart of many government initiatives and building regulations, meaning that ensuring you have the correct loft insulation is vital. This is particularly the case on new build properties, but also impacts old properties too.

Our loft insulation includes a wide variety of options, ranging from boards to rolls to slabs. We also stock a growing range of innovative multifoil insulation, which is ideal for roofing applications where maximum control over air flow is essential. This wide selection of insultation helps towards ensuring that you can find the perfect roof insulation for your project.

Whether you require insulation at 50mm, 75mm, 100mm or 200mm, we'll have an option for you. We also stock a growing list of major roof insulation brands. These include Rockwool, Celotex, Superglass, Kingspan and many more. Each of these manufacturers are widely recognised for crafting high quality and versatile loft insulation.

Thicknesses between 50mm and 200mm
Boards, Rolls, Slabs and Multifoil options
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Roof Insulation

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4,264 Reviews

Gold Trusted Service Award 2019


Rockwool - RWA45 Acoustic Insulation Slab

Rockwool - RWA45 Acoustic Insulation Slab

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Delivery 4-6 Weeks

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Price From: £21.60 PRICE PER ITEM INC VAT £3.80PER M² View
Kay Metzeler - Kay-Cel EPS 70 Polystyrene Insulation

Kay Metzeler - Kay-Cel EPS 70 Polystyrene Insulation

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Price From: £60.00 PRICE PER ITEM INC VAT £20.83PER M² View
Superglass - Superwall 32 Cavity Wall Batt

Superglass - Superwall 32 Cavity Wall Batt

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Price From: £30.00 PRICE PER ITEM INC VAT £6.86PER M² View
Celotex - XR4000 - High Performance Thick Insulation Board

Celotex - XR4000 - High Performance Thick Insulation Board

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Price From: £53.74 PRICE PER ITEM INC VAT £16.66PER M² View
Knauf Insulation - Earthwool DriTherm Cavity Slab - 32 Ultimate

Knauf Insulation - Earthwool DriTherm Cavity Slab - 32 Ultimate

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Price From: £27.60 PRICE PER ITEM INC VAT £50.18PER M² View
Celotex - TB4000 - High Performance Thermal Bridging Insulation Board

Celotex - TB4000 - High Performance Thermal Bridging Insulation Board

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Price From: £14.58 PRICE PER ITEM INC VAT £4.52PER M² View
Rockwool - Flexi Slab Insulation

Rockwool - Flexi Slab Insulation

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Price From: £37.80 PRICE PER ITEM INC VAT £4.58PER M² View
Knauf - Earthwool Acoustic Roll - Ready-cut

Knauf - Earthwool Acoustic Roll - Ready-cut

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Price From: £39.60 PRICE PER ITEM INC VAT £1.65PER M² View
Knauf Earthwool Loft Roll 44 - Combi-Cut Shorter Length

Knauf Earthwool Loft Roll 44 - Combi-Cut Shorter Length

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£24.00 PRICE PER ITEM INC VAT £2.89PER M² View
Celotex PL4000 PIR Insulation Board - Bonded to Plasterboard

Celotex PL4000 PIR Insulation Board - Bonded to Plasterboard

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Price From: £45.02 PRICE PER ITEM INC VAT £13.96PER M² View
Superglass - Superwall 36 Cavity Wall Batt

Superglass - Superwall 36 Cavity Wall Batt

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Price From: £21.60 PRICE PER ITEM INC VAT £2.75PER M² View
Celotex - GA4000 - High Performance Insulation Board For Floors, Walls & Roofs

Celotex - GA4000 - High Performance Insulation Board For Floors, Walls & Roofs

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Price From: £24.22 PRICE PER ITEM INC VAT £7.51PER M² View
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Common Questions

Why Do You Need Insulation? 

Insulation is one of the most effective ways to keep your home warm throughout the winter. It will also help create a more comfortable living space during the summer. 

This is achieved by reducing the amount of heat that transfers from the inside to the outside. Up to 85% of which occurs through the walls, floors, and roof of a building. 

Besides creating a more comfortable living space for your family, this helps to reduce your energy bills by up to £310 per year according to the Energy Saving Trust. 

Insulation is also required under law, with there being minimum levels of thermal insulation when carrying out construction. This includes both new builds and refurbishments. 

The requirements vary between England, Wales, and Scotland. They can also be different for domestic and non-domestic properties. So, you should always check with your local authority. 

How Does Insulation Work? 

Before you can understand how insulation keeps your home warm, you must understand how heat travels through materials, liquids, and gasses. 

There are three fundamental ways heat transfers. These include heat conduction, convection, and radiation. 

Conduction

The way in which heat travels through a material. For example, when heat travels through a ceramic mug containing a hot beverage.  

Convection

This occurs when heat flows through a liquid or gas. This is how a kettle boils water at the bottom, which rises before being replaced by cooler water.

Radiation

When heat travels in a straight line and warms anything in its path that can absorb energy. For example, on a summer's day the sun will heat the bonnet of a car.

Whatever way heat is transferred, warm air will always be attracted to cooler air. That is until there is no difference in the ambient temperature. 

This is why warm air escapes from warm living spaces to adjacent unheated areas. This could be through the loft space, exterior walls or elsewhere. 

To combat this, most insulation uses polyisocyanurate, fibreglass, wool, and other materials to reduce conductive heat flow. 

Although, some other types of insulation also prevent radiant heat flow through the use of foils, films, and papers. 

How Often Should You Replace Insulation? 

Throughout the years, insulation can begin to degrade. This hinders its ability to prevent heat from escaping and, in some circumstances, can result in dampness. 

It is, therefore, important to regularly check your insulation for signs of degradation. This includes your wall, floor, and loft insulation. 

Compression 

Insulation may compress throughout its lifespan. This is particularly common with roof insulation, where heavy items may be placed on top of the boards or rolls. 

The air trapped between the fibres of your insulation plays a crucial role in preventing heat transfer. Compressed insulation typically has fewer air pockets and becomes less effective.

Therefore, you should replace any insulation that has been significantly compressed. This will ensure it meets recommended thicknesses and stops warm air from escaping. 

Dampness 

If you experience severe condensation or have suffered from a leak, your loft insulation may have become damp or wet. 

This moisture will replace the air pockets found within your insulation, impeding its ability to stop heat transfer. It may also result in the release of dangerous mycotoxins.

You’ll need to replace any damp or wet insulation as soon as possible. If it's been caused by condensation, you should also improve ventilation in the area. 

Infestation 

Insulation is an ideal home for rats, mice, bats, and insects. You may, therefore, find that some unwanted visitors have infested your boards or rolls. 

Whilst this won’t necessarily impact its ability to prevent heat loss, it can become dirty and smelly. In some cases, it may also become damp from urine.

You should replace any infested insulation as quickly as possible to prevent it from worsening. The surrounding timber may also need treatment in some circumstances.

What is the Best Insulation Material? 

Insulation is typically produced from one of five materials. These include polyisocyanurate, fiberglass, mineral wool, cellulose, and polystyrene.

Whilst each is designed to prevent heat from escaping, they each offer their own advantages. This includes acoustic insulation, overall durability, and more. 

Polyisocyanurate Insulation

Polyisocyanurate insulation is often referred to as PIR insulation. It is one of the most common types of insulation and seen as an improvement on older PUR insulation.

The core of these boards is incredibly rigid, making it perfect for insulating walls and floors. The core is usually placed between two high-performance aluminum foil facings. 

The unique build-up of PIR insulation makes it a superb thermal insulator that combats thermal bridging. It also has a long lifespan and is resistant to moisture. 

Fiberglass Insulation

Fiberglass insulation is also referred to as glass wool or glass fiber insulation. It is produced by heating glass fibres and bonding them together. 

Due to the way it's manufactured, it contains millions of air pockets. This increases its thermal insulation and helps to maintain its structure. 

Besides being a superb thermal insulator, fibreglass insulation is also a great acoustic insulator. Making it ideal for walls and roofs in particular. 

Lastly, this type of insulation is fireproof and therefore a safe solution for both residential homes and commercial premises. 

Mineral Wool Insulation 

Mineral wool insulation is manufactured from glass that's spun together to create a dense roll or slab. Making it a truly unique and highly versatile solution. 

Despite being lightweight, this insulation is dense enough to hold in place between timber and metal frames. All without the need for additional fixings being required.

Once in place, mineral wool is a superb thermal insulator. But due to its porous and elastic structure, it also offers high acoustic performance. 

As you would expect, this type of insulation is also safe with it being able to withstand temperatures up to 400°C. 

Cellulose Insulation

Cellulose insulation is produced from paper, card, and denim. Unlike insulation rolls or boards, this type of insulation is blown into loft, wall and floor cavities. 

It is perfectly suited for enclosed spaces with obstructions such as pipes and wires. It can also be injected into finished walls, unlike most other forms of insulation.

The feather-like consistency of cellulose insulation makes it a brilliant thermal insulator. All whilst being inexpensive when compared to solutions. 

Despite being manufactured from paper and card, this insulation is treated with fire-retardant chemicals. Making it safe for domestic and non-domestic properties.

Polystyrene Insulation

Polystyrene insulation is manufactured from plastic and amongst the most durable, long-lasting solutions available. It also is also highly resistant to water and damp. 

Due to its rigidity, this type of insulation is easy to install between the metal frame of a wall or timber structure of a roof. Plus, it is a relatively lightweight insulation. 

As polystyrene insulation can be over 95% air, it is a brilliant thermal insulator. However, it is also great for keeping the sound of a busy city or bustling town out. 

Containing a fire-retardant additive, this insulation is a safe solution for both residential properties and commercial premises. 

What is a U-Value? 

Different parts of a property are awarded a U-value, including the walls, floors, and roof. This U-value assesses the rate of heat loss or gain.  

The materials used in your walls, floors or roof do not have their own U-value. Instead, the U-value takes into account the combination of materials. 

For example, when calculating the U-value of a roof you may take account of the roof tiles, roof insulation, and timber materials used. 

U-values are measured in watts per square meter per kelvin (W/(m²K)). The lower the U-value, the more slowly heat is able to transmit through it. 

A building with lower U-values is, therefore, typically able to maintain its heat more effectively. Reducing its carbon footprint and cutting energy bills. 

There are strict requirements throughout the UK that require different parts of a property to achieve particular U-values. 

The U-value required can range from 0.16 W/(m²K) to 0.36 W/(m²K). But these are subject to change and should be confirmed with a local authority. 

What is a R-Value? 

Different materials are awarded an R-value, such as roof insulation and masonry materials. This R-value measures a material's ability to resist heat transfer. 

For materials available in various thicknesses, an R-value will be calculated for each. If a material contains multiple layers, you would combine each layer’s R-value. 

R-values are measured in meters square kelvin per watt (m²K/W). The higher the R-value, the more effective a material is at preventing heat transfer. 

Whilst R-value and U-value are entirely different, the R-value of your materials will influence the U-value awarded to parts of your building. 

The recommended R-value is dependent upon the material. The application can also influence the required R-value for each material. 

For example, homes in the UK should have at least 270mm of insulation and any insulation used in a loft should have an R-value of between 6.1 and 7. 

 

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