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Best loft insulation: Top Choice for Efficiency and Comfort

Loft insulation

There are times when winter conditions turn harsh, and as a result the cost of keeping your home warm can become extortionate. The problem is even worse if your home lacks adequate insulation, especially in the loft space, as this can be responsible for as much as 25% of heat loss from a typical uninsulated home .

The solution lies in insulating your loft. But which is the best loft insulation for your home? There are several types of loft insulation available with their own pros and cons.

Here, we’ll help you learn which loft insulation solution is potentially best for you, as well as give you the basics of loft insulation, its benefits, and drawbacks. 

Loft Insulation: A Quick Overview

Loft insulation is a form of insulation specifically designed to improve the thermal efficiency of a home by reducing heat loss/gain through its roof. It involves adding insulating materials within the loft, effectively creating a barrier that limits heat transfer between the home’s interior and the environment outside. This means you have a layer acting as a year-round guard against energy waste and unwanted radical temperature shifts. 

However, one of the most vital factors affecting your loft insulation is the insulation type used during the installation process. When you use the right material for your loft, you can enjoy many benefits and reduce your environmental impact greatly.

In contrast, improper installation like missing gaps, crevices, eaves, or using low-quality insulating materials can leave your home suffering from heat and energy bill fluctuations year-round.

Types of Loft Insulation 

Several types of insulation can help you mitigate the heat changes within your loft, and, therefore, within the rest of your home. 

One thing to remember, though, is that each one comes with its own benefits and drawbacks. So, here’s what you need to know about the different types of loft insulation:

1. Blanket Insulation

One of the most popular insulation methods is the blanket or batt insulation.This type of insulation is usually fashioned from materials like mineral wool, fibreglass, or sheep’s wool, sometimes featuring a foil backing to enhance its thermal resistance.

The blanket insulation is favoured for its accessibility and ease of installation as it comes in rolls or slabs that you can apply across large, exposed areas without any trouble. What’s more, if you dig around deep enough, you can find certain brands that use non-irritant materials.

The main problem with blanket insulation is that it can take some space as it’s bulky. Hence, it can potentially reduce the usable area in your loft. It can also be challenging to use if the space you’re trying to cover is somewhat small.


  • Ease to Install.
  • Environmentally-friendly material.
  • Non-irritant options are available.


  • It can be bulky, affecting your space.


2. Sheet Insulation

Sheet insulation differs greatly from the previous blanket insulation in various aspects. To start, sheet insulation offers a special solution for insulating the sloping sides of loft roofs

Also, they’re crafted into rigid boards from different materials, such as polystyrene, PIR  (polyisocyanurate), and wood fibre. This type of insulation goes directly below your roof rafters, creating a seamless and effective thermal barrier that enhances your home’s energy efficiency. 

What’s best about these sheets is that you can find some that are fire-resistant, moisture-resistant, or with decorative coverings. Your choice may be affected by your budget, and there are also eco-friendly options with materials like cork and straw, which are sustainable and have lower environmental impact. 


  • The sheet’s design makes them a perfect fit for the curves in your loft.
  • Various environmentally-friendly options.
  • You can easily cover it with plasterboard, offering an attractive finish suitable for living spaces.


  • The production of synthetic insulation materials like PIR can consume significant energy resources. 
  • They’re generally more expensive than other types of insulation.

3. Loose-fill Insulation

As you can tell by its name, loose-fill insulation consists of small, loose, granular or lightweight particles, such as cork granules or mineral wool. These particles are designed to be blown into loft spaces using a specific machine to spread them around evenly.

What makes this type of loft insulation stand out is that it’s not as rigid as the PIR sheets or previous rolls. It’s rather adaptable and can insulate areas with irregular joist spacing and obstructions or simply add an extra layer of insulation over an existing one! Another thing about loose-fill insulation is that it offers options made from recycled materials, such as newspapers, providing a greener insulation solution.

The downside to this method is that, over time, the insulation can settle or shift, especially in draughty areas. This can potentially lead to reduced effectiveness, meaning you must maintain the insulation properly over the years.

Also, the process can be rather messy, with some of the materials being irritating, so it’s best to use protective clothes and safety gear.


  • It can insulate every nook and cranny easily.
  • There are eco-friendly materials to use.


  • The material can settle or shift over time, reducing its effectiveness.
  • It requires more maintenance.


4. Spray Foam Insulation

This type of insulation represents a modern and highly effective way of insulating lofts. This approach uses a liquid compound that, when sprayed, expands to fill in gaps, voids, and uneven surfaces in your lofts by solidifying into a dense layer.

Therefore, reducing any air traffic in and out of the roof and mitigating heat fluctuation. There are two main types of spray foams used for this purpose: Open-cell and closed-cell foam.

The open-cell foam is known for its lighter density and greater flexibility, allowing it to expand significantly. While this meant more adaptability and covering extra tough spots, it also meant that it was permeable.

In contrast, closed-cell spray foam provides a more robust and impenetrable barrier that might help add structural strength! This type offers more moisture and air leakage control, making it a great choice if you live in a rough environment. 

But, of course, this higher efficacy comes with a greater cost, both in terms of material and the necessary professional help. 


  • Excellent coverage.
  • Suitable for a variety of applications, including irregular shapes.
  • It offers notable sound-dampening benefits.


  • It can be more expensive than other methods.
  • Once applied, it’s challenging to modify or remove it.


5. Blown-fibre Insulation

Blown-fibre insulation uses fibrous materials, such as mineral wool or recycled paper, to help you achieve superior thermal efficiency by filling up hard-to-reach gaps within the loft.This makes it one of the best loft insulation methods if you have several irregularly shaped areas and spaces that are challenging to access.

The blown-fibre insulation is rather similar to the loose-fit insulation in the installation process with a few differences. The material also has to be blown into the crevices, but requires a special, high-pressure machine with a professional operating it to ensure optimal results.

Because of that, the cost of this type of insulation is a tad high due to the skilled hands required and the machine.


  • Installation is swift and straightforward.
  • Perfect for lofts with lots of irregular space.
  • Various eco-friendly options are available.


  • Typically costs more when compared to regular insulation methods.
  • It’s not the best option for lofts prone to draughts.

Benefits of Loft Insulation

Now that you’ve learned about the best loft insulation methods, it’s time to understand what insulating your loft could offer you. Here are four key benefits:

1. Reduced Energy Bills

One of the first and most important benefits of installing insulation in your loft is reduced energy bills. The science behind it is actually rather simple.

By insulating the loft, you minimise the energy demand required to either heat or cool your home due to the heat balance the insulation offers. Over time, the savings can accumulate, covering the initial cost of the insulation and turning it into a wise investment.

2. More Comfort 

Insulating your loft comes as a multifaceted solution that improves your living environment through several approaches. For a start, by maintaining a consistent indoor temperature, whether cold or warm, the insulation reduces the drastic fluctuations often experienced with the changing seasons. 

The steadiness guarantees greater comfort in the home. Also, beyond temperature control, the materials used in the loft serve the dual purpose of sound dampening! 

They effectively cut off any external noise from reaching inside your home. Plus, properly installed insulation can act as a barrier against moisture and, as a result, mitigate the risk of dampness and possible growth of mould and mildew.

3. Lower Carbon Footprint

One of the best advantages of insulating your loft is that it significantly reduces your need for heating and cooling, directly affecting your household energy consumption. Your lower usage leads to a form of domino effect as it also lowers the demand on carbon producing power plants, which often rely on fossil fuels. 

Effectively you indirectly reduce greenhouse gas emissions, contributing to a lower carbon footprint.

4. Increased Property Value

Whether you’re thinking about selling your property or not, ensuring its value increases over time is a fantastic investment. And what’s an easy way to accomplish this? Insulating your loft!

Homes that boast superior insulation not only promise reduced energy bills for potential buyers but also offer a more stable and comfortable indoor environment. Of course, these qualities are highly valued in the housing market, as they contribute to lower ownership costs and improved living conditions.

Moreover, such installation shows potential owners that the previous ones did actually care about the home. This means the property has likely been well-maintained in other aspects, instilling confidence in buyers about the overall home condition.

Disadvantages of Loft Insulation

While loft insulation offers numerous benefits to homeowners, it’s essential to consider the potential drawbacks of the installation.Being aware of these can help you make more informed decisions and address any possible concerns. 

Here are three vital points to consider:

1. Initial Cost

The primary issue homeowners associate with lost insulation is the initial costs, as it can be an issue. The expenses encompass not just the cost of insulation materials, which vary widely, but also the potential cost of professional labour. 

Of course, high-quality materials, non-irritants, or ones with special customisation come with a higher price tag.Additionally, the complexity of the loft can necessitate a professional installation to ensure a proper process or specific materials.

Despite these upfront costs, it’s still important to understand the investment nature of loft insulation. Over time, the reduction in energy bills and increased property value truly offset the initial expense.

It is also possible that you might be able to qualify for an insulation grant. Eco Grants can help you find out if you can benefit from one of the government-backed schemes such as the Great British Insulation Scheme or ECO4. 

2. Installation challenges 

The process of installing insulation in a loft can involve navigating tight spaces and dealing with irregular edges and obstructions.

This puts a lot of appeal into doing it yourself and skipping on the labour cost! However, it also means you risk improper installation, which can significantly affect insulation as time goes by. 

Still, don’t let these challenges stop you from seeking loft insulation. All it requires is proper research on the best materials to use and methods for your loft. If it still seems too tricky, you can always hire a professional to help you out.

3. Pest infestation

Unfortunately, while loft insulation guarantees comfort and savings, it also comes with one major drawback: possible pest infestation. Certain insulation materials, like loose-fill or batt insulation, if not meticulously installed and maintained, can provide ideal conditions for rodents, insects and other pests to nest.

Thankfully, there are several ways to mitigate the risk and avoid such infestations. Firstly, make sure you thoroughly seal every entry point and ensure the insulation is intact and properly installed.

Remember, over time, insulation can suffer from wear and tear due to environmental factors or during regular checks. This deterioration can create opportunities for pests to thrive.

As a result, you need to regularly inspect the loft insulation for any signs of pest activity or vulnerability in the barrier. When you address these concerns early on, you guarantee the effectiveness of the insulation and prevent possible infestation.

Final Words

Choosing the best loft insulation for your loft can be a tricky decision to make. After all, the process offers fantastic benefits, such as reduced energy bills, lower carbon footprint, increased property value, and more. 

Plus, each insulation method, blanket, sheet, loose-fill, spray-foam, or blown-fibre insulation all has its advantages. However, there are still some drawbacks to consider, like the potential cost, possible maintenance, and the specific disadvantages of each material and method used.

In short, we can’t say the best loft insulation method is simply one or the other of the above-mentioned. Instead, it’s the one you’ll pick after thoroughly considering your needs, your skills, and your budget.

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