Loft Insulation & Heat Loss Reduction

With most of the United Kingdom moving towards a cleaner, more eco-friendly environment, the topic of home energy efficiency improvements has become commonplace. You may have heard about the benefits of  loft insulation, including its ability to trap heat and keep your home warm and snuggly. But the question remains – how does loft insulation reduce heat loss?

In this article, we’ll explain the ins and outs of loft insulation to help guide you through the process and show you why this type of home improvement is extremely important for a more energy-efficient home.


You Could Be Eligible For Free Home Insulation

Fill-out our quick eligibility test. It takes less than 1 minute!

How Does Loft Insulation Reduce Heat Loss?

Loft insulation plays a really important role in reducing heat loss in homes. Knowing how loft insulation helps to prevent losing heat can help you make a more informed decision about the energy efficiency in your home. And, if you want to lower your energy bills, this is a great way to go.

When you heat your home using central heating or any other system, a large portion of that heat naturally rises and can escape through your roof. This loss happens through both conduction and convection methods. This means that there’s no way to completely stop heat from escaping your home; however, you can reduce the amount of heat you lose.

Loft insulation traps heat inside the materials that you’ve used to insulate your loft space. The insulation material creates a barrier that makes it much more difficult for the heat to escape, thereby keeping your home warmer for longer.

Is Thicker Insulation Better?

Now that you have an answer to the question ‘How does loft insulation reduce heat loss?’, you may want to jump at the chance of installing loft insulation in your home. But there is something else you may want to consider before you do that – loft insulation thickness.

Thicker loft insulation is better for a number of reasons. Firstly, the thickness of your loft is directly related to how efficient it is. Just like wearing a thicker coat in winter, thicker insulation reduces heat loss more effectively. If there is less of a barrier, it is less successful at trapping warm air and instead lets it escape quicker.

Additionally, thicker loft insulation is better for energy efficiency. Since it slows down how quickly heat escapes from your home, you don’t need to continuously warm it. Rather, you can use your heating system to warm your home and then turn it off until all of the air within the insulation materials has dissipated. This helps you to save a ton of money on your heating bills.

It’s usually recommended to have insulation of at least 270 mm thick. If your home already has existing insulation, then you’ll want to top it up to make it as effective as possible.

loft insulation

Spray Foam Insulation

Spray foam insulation is a type of insulation material that is typically applied using a spray or a nozzle, and comes out as a liquid. After the material is sprayed, it starts to expand until it forms a hard, airtight barrier.

When it comes to loft insulation, this spray foam can be used to insulate the underside of the roof space of the loft itself. And, since there are no gaps or seams, this type of insulation is the most practical compared to standard mineral wool insulation.

It is ideal for lofts with irregular shapes or a lot of little nooks and crannies. When the foam expands, it naturally moves to fill these spaces without the need for a finicky installation.

Additionally, spray foam insulation has a high R-value, which is a measure of thermal resistance. Not only does spray foam insulation reduce heat loss, but it also prevents heat transfer. This means that hot air can’t enter your home in the summer months, keeping heat out and your home cool and comfortable.

It’s important to note that foam insulation should always be done by a professional. If it isn’t installed correctly, it may not work to reduce heat loss in your home.

Are There Grants for Loft Insulation?

There are several grants and programmes in Scotland to help boost energy efficiency within your home to aid in keeping your monthly expenses low and the inside of your home warm and toasty in the cold. One of these grants is the Energy Company Obligation 4 (ECO4) grant, which was created to help Scottish residents improve the heating systems and insulation in their homes.

To apply for this grant, you will first need to check your eligibility status. However, if you are eligible, you may be able to receive free loft insulation. Alternatively, if you already have insulation, you may be eligible to have your existing insulation bulked up to the standard 270 mm thickness with mineral wool insulation.

Once you have applied, you will need to have your home assessed. During the assessment, a professional will determine what types of improvements your home needs and the best materials and installation processes.


The amount of heat loss effective loft insulation can reduce depends on the material of the insulation, how thick it is, the size of your loft, and how well it was installed. However, loft insulation can help to reduce heat loss by an average of around 25%.

According to the Energy Savings Trust, having loft insulation in your home can save you up £250 annually, depending on the size of your home. With other energy efficiency methods, like roof and wall insulation, you can increase these savings.

Final Thoughts

Now that we’ve answered the question ‘How does loft insulation reduce heat loss?’, it’s time to get your home assessed for your new insulation installation! With so many benefits to installing additional insulation in your home, including additional warmth (and lower heating bills), there’s no reason not to insulate your home.