The advantages of cavity wall insulation

If you’re a homeowner in need of insulation for your property, you must select the type that best suits your unique requirements. Different kinds of insulation have specific benefits which allow them to help certain homes more than others and understanding these benefits lets you make the right choice.

For example, cavity wall insulation is quite a popular selection for many homeowners – especially during the cost of living crisis. By thoroughly investigating the options available, you can save on bills and feel more comfortable in the property; with this in mind, here’s a comprehensive guide to cavity wall insulation.

What is cavity wall insulation?

Most homes constructed after the 1920s contain concrete or brick-based ‘cavity walls’, with a hollow centre to avoid the spread of damp or moisture. Many of these properties also have cavity wall insulation, but some older buildings only have cavity walls, resulting in a colder and less efficient home. It’s possible to install and replace this form of insulation without negatively impacting the structure’s integrity by drilling holes into the wall and injecting it into the cavity. To see if your home has cavity walls and insulation, consult with your local authority.

Only certain homes are suitable for this form of insulation, even if they already contain a cavity wall. The cavity must be at least 50mm wide without any obstruction from the rubble, and the general masonry of the building has to be of a high standard to ensure safety. On top of this, walls that face frequent exposure to heavy rain, or are within a high-risk flooding location, are less eligible as this could soak into the insulation or lead to a higher risk of damp. Cavity wall insulation is also not suitable for homes that have timber or steel frames.

Advantages of cavity wall insulation

There are many benefits to cavity wall insulation that can make it the perfect choice for your home – assuming your property meets the above requirements. These advantages include:

1. Cost-effective installation

Cavity wall insulation is relatively inexpensive to install in your home – though it always requires a professional to conduct the installation process, while some other forms of insulation allow you to add it yourself. The costs depend on various factors such as property type and location, with installation in flats generally costing around £300, with semi-detached installation costing about £500 and detached homes requiring roughly £700. It’s also possible to get this insulation for free if you’re on specific benefits; for example, if somebody in your home has Income Support or a Child Tax Credit.

2. Significant reduction in bills

The main purpose of cavity wall insulation is to warm your building and make it more energy-efficient, with the overall goal of reducing energy bills. Your specific property is again a key factor in the amount of reduction you see in the energy bills, with flats saving around £90 a year and detached houses potentially saving up to £300 a year. It’s possible (and even likely) that this insulation will pay for itself after a few years, no matter the type of property you have. This makes it a worthwhile investment, reducing your long-term carbon footprint.

3. A warmer home

The main mechanism by which cavity wall insulation saves you money is by heating the home – lessening your dependence on central heating. The insulation slows heat transfer throughout the property, meaning the heat leaves the building much less quickly than it otherwise would. This allows you to feel more comfortable within the home, especially during winter but also has a tremendous impact during summer. In warmer months, you might notice the property heating up less as this insulation prevents too much heat from entering. By using cavity wall insulation, you can maintain a more comfortable temperature throughout the year.

4. Easy installation

Alongside being cost-effective, the installation process is simple and non-invasive. Cavity wall insulation mainly uses polystyrene beads or mineral wool, which professional installers can inject into the walls themselves, even with just a narrow opening. When installers drill into the wall, these holes are typically small enough to cover up easily – they also don’t damage the structure. The time it takes to install cavity wall insulation can often depend on the property size, but a conventional house with accessible walls only takes around two hours in total, allowing you to feel the benefits very quickly.

5. Mould prevention

Another key advantage of this insulation is its ability to suppress the spread of moisture from the outer wall to the inner wall, effectively ‘trapping’ water before it can reach the property and preventing mould growth. If the home regularly faces heavy rainfall, the insulation may only do so much, but most properties can benefit from this lower risk of mould. By warming the property, your cavity wall insulation prevents condensation and creates an environment where dampness and fungi cannot thrive. This is especially helpful during humid weather conditions or in the months when rain is frequent.

6. Low-maintenance

Cavity wall insulation is ‘fit and forget’, meaning you don’t need to consistently maintain it after installation. By taking care of general property maintenance and ventilation, you can continue to receive the many benefits of cavity wall insulation for decades – with the insulation itself possibly lasting for up to a century. If the property requires additional ventilation to combat damp whilst offering more heat, the installer may take care of this as part of the installation. By hiring a professional installer and maintaining your own property, you can make the most of your cavity wall insulation.

Advanced Eco specialises in offering comprehensive insulation and renewable energy installations throughout East Anglia. With over 30 years of experience, we can help your property get the cavity wall insulation it needs at an affordable price, allowing you to keep your home at a comfortable temperature year-round. For more on our services or to book an installation, get in touch with us today.

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