What is a cavity wall insulation?

Your external walls may be composed of an outer and an inner bricklayer with a cavity or space in between them. Cavity wall insulation is simply adding insulation to this space. Insulation can be in the form of cellulose, cavity batts, EPS beads and so on. You can know more about cavity wall insulation in our blog

How does cavity wall insulation work?

The insulating material that is added to the cavities acts as a physical barrier that prevents heat transfer from the inner surface to the outer layer. In summer, it restricts the entry of heat from the outside. For more information, please refer to our blog.

When was cavity wall insulation introduced?

Cavity wall insulation was introduced in 1920. Please refer to our blog for more information.

How much does cavity wall insulation save?

Cavity wall insulation can help you save up to £305/year in energy bills. It reduces 20-25% of heat loss through walls.

What is the cost for cavity wall insulation?

The cost of insulating cavity walls depends on your building type and the type of insulating material you choose. While cavity batt insulation may be cheaper, foam insulation is costly to insulate cavities.

What are the common problems with cavity wall insulation?

Cavity wall insulation is quite commonly associated with damp problems, condensation issues and others. Please refer to our blog, wherein we have discussed the problems relating to cavity wall insulation in detail.

Where can I get cavity wall insulation near me?

You can buy cavity wall insulation batts and boards online right here at Buy Insulation Online and have them delivered to your home or workplace

What are the different types of cavity wall insulation?

Cavity walls can be insulated using cavity slabs like Dritherm 37, Dritherem 32, Superglass Superwall 36 or Celotex cavity boards or PIR. Spray foam insulation or EPS boards are also used to insulate cavity walls

Is it worth getting cavity wall insulation?

Yes. When done right, cavity wall insulation saves nearly 25% of energy in your home. Contact professional, certified installers for installation, do a pre-survey to address any pre-existing problems and choose the insulating material that is right for your cavity walls. Following these steps will help you get maximum out of insulating cavity walls

What type of cavity wall insulation is best?

It depends on the types of cavity walls you have. We recommend cavity batt insulation like Dritherm 37 or Dritherm 32

Does cavity wall insulation cause damp?

Cavity wall insulation does not cause damp problems. Damp is usually from any pre-existing condition in the cavity. This is why pre-installation checks are a must

Whys is cavity wall insulation necessary?

Cavity wall insulation became compulsory in the 1990s in order to reduce energy bills and help protect the environment. The insulation is injected or placed into the gap between the inner and outer walls of a building, preventing heat loss. This greatly improved the energy efficiency of buildings and reduced their carbon footprint, as well as reducing heating bills for homeowners.

Is cavity wall insulation a good idea?

If you have cavity walls, then yes, cavity wall insulation is a good idea. It will help reduce heat loss significantly. If you have solid walls, however, you can look for internal or external wall insulation

Is cavity wall insulation waterproof?

The cavity wall insulation is water-resistant. As such it does not cause dampness or other moisture-related issues in the cavity wall, however, if you have pre-existing moisture problems in the masonry cavities, cavity batts can worsen that.

Cavity wall insulation

Cavity wall insulation is a cost-effective solution to insulate cavity walls and enhance the energy efficiency of UK homes and buildings. By filling the cavity between external walls, cavity insulation significantly reduces heat loss, helping to lower heating bills and maintain a warmer indoor environment. Whether you're working on a new build or retrofitting an existing property, cavity wall insulation installed by a professional installer is essential for long-term energy savings.

Our range of cavity wall insulation products includes mineral wool, polystyrene beads, and polyurethane foam – all designed to deliver high-performance thermal protection for cavity and solid walls. These materials are ideal for enhancing the insulation of external walls, preventing cold spots, and improving overall comfort throughout the year.

Explore our selection of cavity wall insulation solutions to find the right product for your project. With fast UK delivery and trusted installers, we make it easy to improve your home’s energy efficiency and reduce heat loss effectively.

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The Complete Guide to Cavity Wall Insulation in the UK

Cavity wall insulation is one of the most effective ways to reduce heat loss and improve the energy efficiency of homes across the UK. By insulating cavity walls, homeowners can cut their energy bills by up to 35%, while also reducing their carbon footprint.

What is Cavity Wall Insulation?

A cavity wall consists of two layers of brick with a gap, or cavity, between them. Cavity wall insulation involves injecting insulating material into the cavity to reduce heat loss through the outside walls. This method is suitable for cavity wall insulation in homes built after the 1920s, which typically feature cavity wall construction.

Benefits of Cavity Wall Insulation

Energy Savings – Proper insulation can cut annual energy bills significantly.
Reduced Heat Loss – Filling cavity walls helps keep heat inside the home, maintaining a comfortable temperature.
Quick Installation – Installing cavity wall insulation can often be completed within a day.
Government Support – Free cavity wall insulation may be available through government insulation schemes.
Environmentally Friendly – Lower energy consumption reduces carbon emissions.

How is Cavity Wall Insulation Installed?

Survey and Assessment – A registered installer will carry out a survey to ensure the home is suitable.
Drill Holes – Small holes (about 1m apart) are drilled into the outside walls.
Inject Insulation – Insulating material (such as mineral wool or polystyrene beads) is injected into the cavity.
Seal and Finish – The holes are filled and sealed, leaving the brickwork intact.

Types of Cavity Wall Insulation

Mineral Wool – One of the most popular choices, offering excellent thermal performance.
Polystyrene Beads – Small beads injected into the cavity that lock together, providing great insulation.
Foam Insulation – Polyurethane foam expands to fill the cavity, providing a seamless layer of insulation.

How to Know if Your Home Needs Cavity Wall Insulation

Home Age – Most homes built after the 1920s have cavity walls.
Brickwork Pattern – Cavity wall homes typically have uniform brick patterns.
Wall Thickness – Walls thicker than 260mm likely have a cavity.
Professional Survey – An installer will confirm if your home is suitable for cavity wall insulation.

CIGA Guarantee

All standard cavity wall insulation installations by accredited professionals come with a 25-year CIGA guarantee, ensuring long-term peace of mind.

Conclusion

Cavity wall insulation is an investment that enhances home comfort, reduces energy bills, and improves overall energy efficiency. With support from insulation schemes and professional installers, homeowners across the UK can benefit from this cost-effective and sustainable solution.

Get in touch with a registered installer today to start insulating cavity walls and unlock significant energy bill savings.