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Loft Insulation

Installing loft insulation is one of the most effective ways to reduce utility bills and make your home energy efficient. Proper roof insulation is at the heart of many government schemes and initiati...

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Recticel Eurowall - PIR Cavity Wall Insulation Board

Recticel Eurowall - PIR Cavity Wall Insulation Board

2-5 Days

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Isover CWS 36 - Glass Mineral Wool Cavity Wall Insulation Slab

Isover CWS 36 - Glass Mineral Wool Cavity Wall Insulation Slab

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Thermafleece CosyWool - Sheep's Wool Insulation Roll

Thermafleece CosyWool - Sheep's Wool Insulation Roll

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Jablite EPS 70 - Polystyrene Floor Insulation Slab

Jablite EPS 70 - Polystyrene Floor Insulation Slab

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Recticel Eurothane PL - PIR Insulated Plasterboard

Recticel Eurothane PL - PIR Insulated Plasterboard

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Isover Spacesaver - Glass Mineral Wool Loft Insulation Roll

Isover Spacesaver - Glass Mineral Wool Loft Insulation Roll

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Thermafleece SupaSoft - Recycled Plastic Insulation Roll

Thermafleece SupaSoft - Recycled Plastic Insulation Roll

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Isover CWS 32 - Glass Mineral Wool Cavity Wall insulation Slab

Isover CWS 32 - Glass Mineral Wool Cavity Wall insulation Slab

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Recticel Eurothane GP - High Performance PIR Insulation Board

Recticel Eurothane GP - High Performance PIR Insulation Board

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British Gypsum Gyproc Thermaline - PIR Insulated Plasterboard

British Gypsum Gyproc Thermaline - PIR Insulated Plasterboard

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Rockwool - Mineral Rock Fibre Fire Barrier System (4m x 1m x 60mm - 3.5m2)

Rockwool - Mineral Rock Fibre Fire Barrier System (4m x 1m x 60mm - 3.5m2)

4-6 Weeks

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Knauf Earthwool DriTherm 37 - Glass Mineral Wool Cavity Wall Insulation Slab - (1200mm x 455mm x 75mm - 4.37m2)

Knauf Earthwool DriTherm 37 - Glass Mineral Wool Cavity Wall Insulation Slab - (1200mm x 455mm x 75mm - 4.37m2)

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WHAT'S IN YOUR BUDGET?

How to Calculate Your m²/ft²?

How to Calculate Your m²/ft²?

It’s actually very easy to calculate how many square meters or foot an area is, whether it is a simple rectangle or more complex shape. When dealing with a simple rectangle, just multiply the length by the width for your total square meterage or footage. If you’re dealing with a more complex shape, treat each area as a rectangle and perform the same calculation. Then combine the square meterage or footage of each area for to get the total area.

calculate m2 illustration

Common Questions About Loft Insulation 

How Does Insulation Work? 

To help you understand how loft insulation helps to keep your home at a comfortable temperature, it’s useful to understand the ways in which heat travels through materials, liquids and gases. There are three fundamental ways that heat transfers. These are heat conduction, convection and radiation. 

Conduction

This is the way heat travels through solid material. For example, when heat travels through a ceramic mug containing a hot drink.

Convection

Convection occurs when heat travels through liquid or gas. This is how a kettle works, by boiling water at the bottom which then rises as cooler water replaces it.

Radiation

Radiation is when heat travels in a straight line, warming anything in its path that can absorb energy. For example, a car bonnet being heated by the sun on a hot summer’s day. 

Whichever way heat is transferred, warm air will always be attracted to cooler air. This will occur until there is no difference in ambient temperature. This is why warmth is lost from your home, as the warm air from heated living spaces in your home travel to adjacent unheated areas. This can be the loft space, exterior walls or elsewhere. 

To combat this heat loss, loft insulation materials such as PIR, fibreglass, wool and others are designed to greatly reduce conductive heat flow. Although some forms of insulation also prevent radiant heat flow via the use of foils, films and papers.

How Often Should You Replace Loft Insulation?

Over time, insulation can begin to degrade due to a number of factors. This diminishes its ability to prevent heat escaping and in certain circumstances, can result in damp. Therefore, it’s very important for you to regularly check insulation for signs of wear. This goes for roof insulation as well as the insulation in your walls and floors.

Compression 

Insulation may become compressed over its lifespan. This is particularly common with roof insulation, where heavy items may be placed on top of the loft insulation boards or rolls and weigh them down. One factor that allows insulation to work is the way in which air is trapped in small pockets within the material. If the insulation becomes compressed, there’ll be fewer air pockets and therefore your insulation will be less effective. 

Therefore, any insulation that has suffered significant compression should be replaced. This will ensure that it meets recommended thicknesses and will perform at its best. In some circumstances, you can simply place new insulation on top of your existing insulation. But ensure you follow the manufacturers recommendations.

Dampness

If you’re experiencing severe condensation or have suffered a leak in your home, your loft insulation may have become damp or wet. This excess moisture fills the air pockets within your roof insulation, impeding its ability to prevent heat transfer. Depending on the insulation material used it may also result in the release of dangerous mycotoxins.

Any damp or wet insulation should be replaced as soon as possible. If the damp has been caused by condensation, you’ll also need to improve ventilation in the area. It is important that you never place new insulation on top of damp insulation, as this moisture will quickly spread and render the new insulation useless.

Infestation

Unfortunately, insulation can also be an ideal home for pests such as rats, mice, bats and insects. You may therefore find that unwanted visitors have infested your loft insulation boards. While this won’t necessarily affect the ability of your roof insulation to prevent heat loss, it can become dirty and smelly; or even damp from urine. Any infested roof insulation should be replaced as quickly as possible to prevent the problem from becoming more severe. In certain circumstances the surrounding timber may also need treatment.

What is the Best Loft Insulation Material?

Insulation is typically made of one of six materials. These include polyisocyanurate, fibreglass, mineral wool, cellulose, polystyrene, or sheeps wool. While they will all have been designed to prevent heat loss, each material also has its own advantages, including acoustic insulation, durability and more.

Polyisocyanurate Insulation

Polyisocyanurate or PIR insulation is one of the most common types of insulation and is widely seen as an improvement on the more outdated PUR insulation. The core of PIR insulation 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.

Fibreglass Insulation

Fibreglass insulation is also known as glass fiber or glass wool insulation. It’s produced by heating glass fibres to a very high temperature and bonding them together. Due to the way it’s manufactured, fibreglass insulation contains millions of air pockets, making it a highly efficient thermal insulator and helping to maintain its robust structure. Fibreglass insulation is also a fantastic acoustic insulator, making it the ideal choice for wall insulation and roof insulation. Finally, this form 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 fibres spun together to create a very dense roll or slab. Mineral wool insulation is a truly unique and highly versatile loft insulation solution. Despite its light weight, mineral wool is very dense and able to hold in place between both timber and metal frames, all without the need for additional fixings. Once installed, mineral wool is a superb thermal and acoustic insulator thanks to its porous, elastic structure. This type of insulation is also very safe and able to withstand temperatures of up to 400C.

Cellulose Insulation

Cellulose insulation is produced from a mix of paper, card and denim. Unlike standard insulation rolls or boards, this kind of insulation is blown into loft, wall and floor cavities. It’s 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. This makes 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. 

Sheep’s Wool Insulation

Sheep’s wool insulation is becoming increasingly popular as loft insulation thanks to its strong performance as a thermal and acoustic insulator. What’s more, it’s far more eco-friendly than traditional manmade roof insulation. Not only is it much easier to work with as it’s non-toxic and non-irritating, but it’s also much more simple to dispose of, able to be recycled or even composted.

What is a U-Value?

Different parts of your property will be awarded a U-value, including the walls, floors and roof. The U-value denotes thermal transmittance, or the rate of heat transfer through a structure. A U-value isn’t attributed to the materials in your walls, floor or roof, but rather the full combination of materials.

For example, when calculating the U-value of a roof you may take the roof tiles, roof insulation, and timber materials used into account. U-values are measured in watts per square meter per kelvin (W/(m²K)). The lower the U-value, the more slowly heat transfers 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 certain 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 your local authority. 

What is an R-Value?

An R-value is the measure of how well a two-dimensional barrier resists heat transfer. As loft insulation materials come in a variety of thicknesses, a unique R-value will be calculated for each. If a material is made up of 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 loft insulation should have an R-value of between 6.1 and 7.

Can Landlords Get Free Loft Insulation?

No, it was previously the case that landlords were able to get free cavity wall and loft insulation through the Cocoon scheme, run by the United Sustainable Energy Agency. However, this scheme was ended in 2012.

Landlords do have to be aware however that thanks to the Energy Act 2011, any tenant requesting reasonable improvements to the energy efficiency of the property they rent must receive them. In addition to this, it is also unlawful to rent out a property that does not meet an Energy Performance Certificate Rating of ‘E’.

Can I Get Free Loft Insulation?

Yes, depending on your circumstances. Energy firms are offering free cavity wall and loft insulation worth up to £1,100 for free if you own your own home and meet certain criteria. If your home is inadequately insulated, then installing proper loft insulation is a very wise investment. You could potentially save hundreds of pounds every year on your energy bills.

Can You Top Up Loft Insulation?

Yes, it’s possible for you to top up existing loft insulation. Typically, old insulation will not need to be removed and replaced completely as it will still retain its thermal properties. A full removal and replacement are usually only required if the roof insulation has severely degraded. This could be due to factors such as damp or infestation.

What Loft Insulation Grants are Available?

There are a number of loft insulation grants available to homeowners in the UK. If you’re looking to improve your home’s thermal efficiency, it’s a great place to start. Improving the quality of the insulation in your home, particular loft and cavity wall insulation can save you up to £300 on your yearly energy bills!

Does Loft Insulation Between Rafters Cause Condensation?

Pitched roof or loft insulation installed between rafters can make your loft space colder. This could cause further damp or condensation if there’s already a problem. If this is the case you may need to increase ventilation in the space to help prevent excess moisture. This can be achieved through the use of ridge, eaves and tile vents.