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SpotDif’s ultimate 2024 guide to loft insulation

Welcome to SpotDif’s Ultimate 2024 Guide to Loft Insulation, your go-to resource for mastering home insulation this year. Are you looking to upgrade your loft insulation, slash your energy bills, or simply make your home more eco-friendly? If so, this guide is crafted just for you.


In this guide, we offer our advice on the various types of loft insulation popular in the UK, such as blanket, sheet, loose-fill, and blown-in insulation. We can also help you find the right supplier for you, so you can buy with confidence. 


From grasping the fundamental properties to evaluating costs and performance benefits, our thorough rundown will provide you with all the knowledge you need. Ready to find out which loft insulation is the perfect match for your home?


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What is loft insulation?

Loft insulation is a material, often made from fibreglass, mineral wool, or cellulose, that is installed in the attic space of a home to reduce heat loss and improve energy efficiency. It works by trapping heat within your home, significantly reducing the amount of heat that escapes through your roof.


Loft insulation passively maintains your home’s warmth, making it far more energy-efficient and saving you money too. It requires no electricity to operate and remains effective in all seasons, ensuring your home stays warm in the winter and cool in the summer.

How SpotDif can help you find the ideal loft insulation provider

SpotDif simplifies your search for loft insulation. By comparing local providers, reviewing their services, and customer feedback, SpotDif ensures you get the best match for your specific insulation needs. Whether looking for the most sustainable option or the best value for your budget, we’ll connect you with the right professionals.

Benefits of installing loft insulation

Loft insulation serves as a fundamental part of your heating strategy and complements the efficiency of all heating systems by reducing the need for their use. Here are some of the most striking benefits of updating your loft insulation.


Universal compatibility


Upgrading your loft insulation fits in with all home energy efficiency plans, regardless of the heating system you have in place. This makes loft insulation a core part of every eco-home strategy. 


Accessibility for homeowners


Almost any homeowner can upgrade their loft insulation, making it a feasible option for improving energy efficiency wherever you live in the UK. 


Cost savings


By minimising heat loss, enhanced loft insulation reduces the need for constant heating, leading to lower energy bills and substantial savings over time.


Low carbon impact


Loft insulation lowers your carbon footprint by reducing reliance on energy from carbon-intensive sources. With effective insulation, you use less energy heating your home, allowing you to reduce your environmental impact and rest easy, knowing you're contributing positively to the planet.


Longevity and low maintenance


Once installed, loft insulation can last for decades without needing significant maintenance. In fact, we believe it’s one of the most cost-effective and sustainable choices for homeowners wanting to save energy long-term.


Low maintenance requirements across loft insulation types


Across all types, loft insulation requires relatively low maintenance compared to mechanical systems. There are no moving parts, and once installed, materials like blanket or sheet insulation need little to no upkeep aside from periodic checks to ensure there are no shifts or gaps in coverage. This ease of maintenance helps keep operational costs low and system efficiency high.


Improving home comfort with modern loft insulation


Modern loft insulation materials have greatly enhanced home comfort by maintaining more consistent indoor temperatures, reducing drafts, and minimising the entry of external noise.


Properly insulated homes have fewer hot or cold spots, and the indoor environment becomes more pleasant and liveable. Additionally, some insulation materials can improve the overall air quality by reducing the influx of dust and allergens from outside.

Expert opinion

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Your loft is where you lose the most heat, it's a far better investment than something like replacing windows


- Emma, Carbon Zero Solutions

Types of loft insulation available in the UK

In the UK, choosing the right type of loft insulation is essential for improving home comfort, reducing energy bills, and minimising environmental impact. Each type of loft insulation offers unique advantages and may be more suitable for different settings and requirements. 


Let’s compare your main options so you can make an informed decision on the best insulation for your home.


Blanket insulation (batts and rolls)


Blanket insulation, including batts and rolls, is a popular choice due to its simplicity and effectiveness. It's typically made from fibreglass or mineral wool and is ideal for DIY installations in easily accessible spaces. While it's straightforward to install between joists and rafters, its performance is highly dependent on proper fitting. 


Environmental benefits: Blanket insulation is often made from eco-friendly materials such as recycled cotton and fibreglass, reducing the demand for virgin resources and minimising environmental impact.


Price: One of the most cost-effective insulation options, blanket insulation offers an affordable solution for homeowners looking to enhance energy efficiency without a significant upfront investment.


Maintenance: This insulation type requires minimal maintenance once installed, as it does not settle over time and maintains its effectiveness without needing adjustments or updates.


Durability: Designed to last for decades under normal conditions, blanket insulation is resistant to moisture and does not degrade easily, ensuring long-term thermal performance. While all materials will degrade over time, the degradation process for blanket insulation occurs very slowly. 


Versatility: Highly versatile, blanket insulation can be easily cut to fit various spaces, making it suitable for walls, floors, and ceilings across different building types.

The SpotDif opinion

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We think that blanket insulation is a great first step for standard loft spaces without too many obstructions.

Loose-fill insulation

Loose-fill insulation involves materials like cellulose, mineral wool, or fibreglass granules that are blown into place, filling all the gaps and irregular spaces in the attic. This type is known for its excellent fit around obstructions, providing a more complete insulation solution. 


  • Environmental benefits: Loose-fill insulation often contains recycled materials such as cellulose, which is made from recycled paper products. This makes it a sustainable choice that helps reduce landfill waste.


  • Price: Typically cost-efficient, loose-fill insulation allows for an economical way to improve home energy efficiency, particularly when filling irregular spaces or topping up existing insulation.


  • Maintenance: While generally low maintenance, loose-fill insulation can settle over time, which may require additional material to be added to maintain its effectiveness.


  • Durability: Loose fill insulation is durable when properly installed and maintained. However, it may be susceptible to moisture, which can affect its insulating properties and longevity.


  • Versatility: Highly adaptable, loose fill insulation can be effectively used in hard-to-reach areas, such as attics, crawl spaces, and between walls, making it ideal for retrofitting older buildings where other types of insulation might be difficult to install.

The SpotDif opinion

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We suggest using loose-fill insulation for retrofitting and upgrading existing buildings. Loose-fill insulation is ideal for filling irregular or hard-to-reach spaces where other insulation types cannot easily be installed.

Sheet insulation

Sheet insulation consists of rigid panels, often made from polystyrene or polyurethane foam, and is perfect for insulating loft floors and roof linings. This type of insulation is effective at blocking thermal bridging and is moisture-resistant. 


Installation can be more complex and may require professional help, especially when cutting panels to fit awkward spaces. Sheet insulation is well-suited for lofts that are also used as living spaces, as it provides robust insulation with minimal thickness.


  • Environmental benefits: Sheet insulation often incorporates materials with high recycled content, such as polystyrene or polyisocyanurate, reducing environmental impact by utilising post-consumer waste.


  • Price: While generally more expensive than other types of insulation like fibreglass batts, sheet insulation offers a higher R-value per inch, which can lead to greater energy savings over time.


  • Maintenance: Sheet insulation requires little to no maintenance once installed, as it is resistant to moisture and does not degrade or settle like fibrous insulation materials.


  • Durability: Known for its robustness, sheet insulation is impervious to moisture and pests, maintaining its structural integrity and insulative properties over a long lifespan.


  • Versatility: Extremely versatile, sheet insulation can be cut to fit a variety of spaces and shapes, making it suitable for everything from exterior wall sheathing to specialised applications like insulated ductwork.

The SpotDif opinion

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We think that sheet insulation is ideal for applications requiring high insulation values with minimal thickness. This makes it ideal for basement walls, under floors, and in limited space scenarios like around door frames.

Blown-in insulation

Blown-in insulation is similar to loose-fill but typically uses smaller, more compact materials that are applied with a special blower. This type is especially effective in providing a dense, even layer of insulation that conforms closely to the loft space, including around pipes and under eaves. Blown-in insulation is an excellent choice for achieving high levels of thermal efficiency and is best installed by professionals to ensure optimal coverage.


Each insulation type has its merits and can dramatically enhance the efficiency of a home when installed correctly. Whether you're renovating an old property or building a new one, selecting the right loft insulation is key to creating a comfortable and energy-efficient home environment.


  • Environmental benefits: Blown-in insulation, especially when made from cellulose, is environmentally friendly as it typically uses up to 85% recycled paper content. This helps in reducing landfill waste and utilising repurposed materials.


  • Price: Blown-in insulation is cost-effective, particularly for attics and closed cavities, as it allows for comprehensive coverage with minimal waste and relatively low installation costs.


  • Maintenance: Requires periodic checks to ensure it hasn't settled significantly, as this can reduce its effectiveness. However, if properly installed and undisturbed, it requires little ongoing maintenance.


  • Durability: While blown-in insulation is generally durable, it can be prone to settling over time, which may slightly diminish its thermal performance unless topped up.


  • Versatility: Highly versatile, blown-in insulation is excellent for filling irregular spaces, gaps, and around obstructions, making it ideal for retrofitting older homes where other insulation types might be challenging to install.

The SpotDif opinion

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We think that blown-in insulation is best to add to existing finished areas, irregularly shaped spaces, and around obstructions where other types of insulation are impractical. This means that blown-in insulation is ideal for attics and enclosed existing walls.

Ready to compare loft insulation suppliers?

Additional cost factors

Size of loft


The larger your loft, the more material you'll need, which will increase the overall cost. In addition to this, a larger loft can also lead to greater energy loss if not properly insulated, translating to higher energy bills. It's important to balance the size and insulation quality to maximise energy efficiency and cost-effectiveness.


Access and ease of installation


Difficult access or a complex roof structure can increase labour costs as more time and specialised techniques are required. We always recommend hiring a professional to install your loft insulation. 


Existing insulation


If old insulation needs to be removed before installing new materials, this will add to the cost.


Insulation thickness


Opting for higher R-values (a measure of thermal resistance) for better energy efficiency can also increase the cost due to the use of more or higher-quality materials.

Which loft insulation is right for your property?

For a professional inspection of your loft to assess the condition and suitability for insulation, you can expect to pay around £295. This type of inspection generally includes a detailed assessment of the roof timbers and other structural elements, which is crucial before undertaking any insulation work to ensure that there are no pre-existing issues that could affect the performance of the new insulation​.


As for the time commitment, a thorough insulation job on a typical loft using materials like blanket or loose-fill insulation can be completed in about 2 to 4 hours​​. However, if your project requires more specialised solutions like spray foam insulation, it might take a bit longer, especially if the area is difficult to access or if there are other complexities involved​.


Overall, taking the time to consult with a professional and getting a proper inspection done ensures that the insulation is correctly installed, maximises energy efficiency, and is cost-effective in the long run. Choosing the right loft insulation for your home involves assessing your loft space for accessibility and existing insulation, considering the type of roof you have, and understanding the different insulation types available. 


We recommend consulting a professional for tailored advice and to ensure compliance with local building regulations. This approach will help you choose the most effective and cost-efficient insulation for your property.


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Find the best loft insulation suppliers with SpotDif

SpotDif is your essential resource for comparing local loft insulation providers to find the best deals. We tap into our network of trusted UK insulation suppliers and evaluate their products and pricing for you.

Begin your search for efficient and cost-effective loft insulation suppliers, or reach out to us today to get started.

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Anna Dearden
Home Sector Specialist
Combining in-depth research with an interest in all things home improvement, I aim to keep SpotDif readers up to date with interior design trends, renewable energy options, and more.
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