Cavity Wall Insulation

Save money and reduce your energy consumption with our bespoke cavity wall insulation services. Choose from spray foam cavity wall insulation, EPS Beading or another type of traditional insulation. With over 20 years of experience, we can help you take your property to the next level.

Cavity Wall

What is Cavity Wall Insulation?

A cavity wall is a wall in your property that consists of a spacing in between another wall. For example, the exterior wall of your house may be a cavity wall, which is two walls together separated by a gap. This is a relatively modern form of construction for residential and commercial properties. Traditionally walls were singular, and so could not be insulated as well as a cavity wall.

Cavity wall insulation simply fills the gap between the two walls, allowing for a more insulated, soundproof and robust structure. Due to its versatile nature and thermal properties, spray foam is an ideal candidate for cavity wall insulation.

Do you have a Cavity Wall?

Use our grid below to determine whether your property has cavity walls. .

The brick layout pattern is even.

All the properties of the wall are the same length.

The brickwork is more than 260mm thick.

The majority of homes built post-1920 have cavity walls.

You can look down the cavity from the attic.

The lengths of the bricks are similar.

There are round holes in between bricks, where insulation has been previously blown in.

Narrow walls are usually solid, not cavity walls.

Why do I Need Cavity Wall Insulation?

Insulating cavity walls is important for every type of property, whether it be commercial or residential. Here are the top 4 reasons why cavity wall insulation is vital:

1 Non-Insulation

Modern builds most likely have cavity walls, and by not having them professionally insulated, your home will be losing heat unnecessarily. This will cost you more in energy bills and leave you open to discomfort and coldness in your own home. Non-insulation gives rise to issues that can be easily avoided.

2 Prevent Mould

Cavity wall insulation can prevent the passing of water, toxins, pollutants and other nasty surprises. The cell composition of certain installations such as spray foam, means that it can prevent the growth of mould in your property. Foam cavity wall insulation keeps your property healthy for longer and requires less maintenance too.

3 Enhanced Quality of Life

Installing cavity wall insulation can help you improve the quality of your life. As you are essentially slowing down the movement of heat through your walls, keeping it inside your home. It’s important to maintain a steady temperature throughout the cold winter months and the warm summer months. Cavity wall insulation can provide this for all seasons, as such, enhancing the quality of your life.

4 Added Value

Spray foam cavity wall insulation that lasts the lifespan of your home will bring value to it (an average of £12,500 nationwide). Not only is it extremely unlikely that this kind of thermal insulation will need to be replaced, but it adds stronger structure, air quality and soundproofing too – all factors that help you to maximise the takings from the sale of your home.

Spray Foam Cavity Wall

Spray Foam Cavity Wall Insulation

Spray foam cavity wall insulation is one of the most effective insulation types currently on the market. Small entry holes are drilled into the exterior of your property. Spray foam insulation is sprayed, in a liquid form, into the cavities between the two walls. Then it transforms into a foam, expanding up to 100 times its original size. The holes are then filled and can be painted.

Our experts' most recommended cavity wall insulation is spray foam insulation. Spray foam insulation is an eco-friendly and cost-effective alternative to previous methods of insulation. In addition to this, the procedure for foam cavity wall insulation is non-invasive, and the results invaluable.

Open-cell spray foam is ideal for homes in need of soundproofing, as it's one of the most effective insulants for handling noise pollution on the market today. On the other hand, closed cell foam has one of the most superior thermal properties any insulation type has to offer, and can help you save up to 35% on your monthly energy bills.

The Benefits of Spray Foam Cavity Wall Insulation

From improving your carbon footprint, to saving money, to noise reduction, the benefits of installing foam cavity wall insulation are plentiful. Discover some of the key advantages below:

1 Save Money

Insulating your cavity walls is one of the most cost-effective means of conserving energy. Up to 33% of heat loss occurs through walls, and is arguably the most wasteful and avoidable kind of loss. Installing spray foam cavity wall insulation will dramatically reduce this figure, and in turn will help you cut the cost of your monthly energy bills by up to 35%. What’s not to love about that?

2 Environmentally Friendly

Spray foam insulation is one of the most eco-friendly insulants currently available. Since it reduces your energy consumption, lowers your energy bills, and contains no toxic chemicals; installing spray foam cavity wall insulation will help you lower your carbon emissions, and is one of the many reasons why the UK government is pushing for spray foam insulation to be installed in all homes across the country (they’re even providing funding for it under the ECO3 Scheme). This makes spray foam insulation the obvious choice for the conscious consumer.

3 Enhanced Quality of Life

By insulating the cavities in your walls, you are essentially slowing down the movement of heat through your walls, keeping it inside and keeping your home warm and comfortable. It is important to maintain a good indoor temperature throughout the cold winter months and the warm summer months. Cavity wall insulation is both a solution for winter and summer, enhancing your quality of life every day.

4 Ease of Installation

Typical insulation processes can be messy, invasive and disturbing, creating unwanted havoc in your household. However, our spray foam cavity wall insulation process offers minimal invasiveness and little to no disruption. Our professionals simply spray the insulation through a hole directly into your cavity walls, filling them up with the quality insulation. It’s quick, easy and stress-free.

5 Soundproofing

Do you live in a noisy area or experience unwanted noises throughout the day? Foam cavity wall insulation can fix that. Spray foam has high-performing acoustic properties that absorb sound and provide you with the peace you both desire and are entitled to within your own space. So let’s cancel out those unwanted noises with our insulation products.

6 Structural Integrity

By using our spray foam cavity wall insulation, you will bring a lot of structural integrity to your property. Filling your home's cavity can reinforce your properties walls, creating a firm and sturdy effect. If your property is situated in areas that are subject to harsh weather, then insulating your cavity walls is the perfect solution for you.

Other Types of Cavity Wall Insulation Products

As well as spray foam cavity wall insulation, there are two more products you can use to insulate the cavity between your external walls. Our professionals also recommend EPS beading and fibre insulation.


EPS Beading Insulation

EPS Beading can provide insulation to your cavity walls at a high level. This insulation is strictly applicable to cavity walls and is more traditional than spray foam, yet is still an advanced and effective solution. More drill holes will be required to complete your cavity wall insulation compared to spray foam insulation, as EPS beads fill your cavities

EPS Beading involves the process of injecting beads into the cavity of your wall. These beads will last the lifespan of your property. Importantly, if you use an EPS Beading solution, there is no need to install the traditional cavity boards to fit the insulant, therefore saving time and money.

See our page on EPS beading for more information on this innovative cavity wall insulation method.

Fibre Insulation

Lastly, our least requested form, but an applicable form of cavity wall insulation, is fibre insulation. This is one of the most traditional forms of insulation used for cavity walls, and it consists of an entirely dry insulant.

The benefits of using fibre insulation for cavity walls is that it requires simple planning, can be quick to insulate with the correct measures, and it is one of the cheaper types of insulation. Additionally, fibre insulation is more eco-friendly than older insulation such as copper cables.

Fibre Insulation
where to get cavity wall insulation supplier

Why Choose Us to Take Care of Your Cavity Wall Insulation:

For over twenty years, Eco Spray-Foam Systems has been delivering premium quality products and expert services. We provide the latest technological insulation solutions for modern-day applications and are certified users of the Icynene spray foam product, which is one of the newest insulating technologies on the market today.


  • What is a Cavity Wall?

  • A cavity wall is when your external walls of your property is constructed of two masonry walls, which leaves a gap, know as the cavity, in between the two walls. Cavity walls are very common in homes and is a relatively modern form of construction in residential properties.

  • Is my House Suitable for Cavity Wall Insulation?

  • Our insulation experts can undergo a survey of your property to assess the suitability for cavity wall insulation, providing professional advice on the next steps to take in order to carry out the insulation installation.

  • How can I tell if my Walls are Full??

  • Our experts use an injection assessment pattern that monitors injection holes to see that the insulation material meets and passes each hole until it is full. Each system also has a defined pattern of holes that will need to be tested and verified, which, consequently, results in a complete fill.

  • How Long will Cavity Wall Insulation Last?

  • According to the BBA (British Board of Agreement), cavity wall insulation will last for the life of the building. When you use a spray foam insulant, we also provide a 25-year insurance guarantee when you use our spray foam insulation.

  • Will my Home be Warmer in the Winters?

  • Yes, by installing cavity wall insulation, you will reduce the amount of heat exiting your walls (which can be up to 33% of your properties heat), therefore, keeping the warmth in your home. Additionally, your household will retain its temperature for longer, as your wall’s thermal resistance would be increased.

  • Do I need to do anything before the Installation?

  • When installing insulation via an injection method, there may be some vibration of the walls, so we recommend removing any ornaments, frames or other delicate furniture/accessories you may wish to protect. All walls will undergo an assessment/surveying process to assess what will be required to install the insulation.

  • How is the Cavity Wall Insulation Installed?

  • Our experts inject cavity wall insulation directly into the cavity, for example, using spray foam, we will inject it into the wall’s cavity via an external hole in the mortar joint. Holes are typically small, between 22-25mm diameter and are fixed post-injection. Each hole made will follow an injection, starting from the very bottom hole.

We are pleased to offer bespoke insulation services across the whole of the United Kingdom, including London, Essex, Kent and Manchester. If you want to find out more about our services and products, or book your free survey, you can call us directly on 0203 411 5188, or fill out this contact form. Our friendly team of experts can’t wait to hear from you.