Cavity Wall Insulation – Which Cavity Wall Insulation is Best For New Build?

Cavity wall insulation has long been viewed as a key factor in a home’s energy efficiency. A whole house approach to energy improvements though, including roof and floor insulation, windows and heating systems etc is usually required to maximise a property’s potential energy performance. Despite this, upgrading to cavity wall insulation is still considered by many to be one of the best ways to reduce a home’s energy bills.

Whether this is the case though will be dependent on a number of factors. Firstly, it is important to understand that there is no one size fits all when it comes to cavity wall insulation; as such, finding the right solution will be dependent on the age of the property and the type of cavity wall in place.

Rigid insulation boards are generally the preferred choice for new build properties. These can be installed as part of the construction process and offer an effective and cost-efficient solution. Typically made from polystyrene beads or granules, these are designed to effectively trap heat within the walls, offering a more ‘gap-free’ style of insulation. They also tend to be moisture-resistant, making them suitable for older properties where damp issues may have arisen.

Mineral wool fibre is another popular option for older properties. It is breathable, which allows moisture to pass through the wall whilst still providing insulation, and it is also often moisture-resistant. This makes it ideal for older properties where maintaining a dry and healthy environment in the walls is critical to prevent damp problems, mould growth and other related health issues.

While mineral wool is a popular option, it has been found to degrade in damp conditions and can be susceptible to sagging and settling after the insulation procedure takes place. This is where more recent technologies such as spray foam insulation can provide a better solution. Spray foam insulation, which is typically based on polyurethane, is more resilient and has the ability to expand when sprayed. This allows it to fill every gap within the cavity, preventing cold spots and ensuring a complete and even finish to the insulation.

In addition, open cell spray foam is generally favoured over closed cell. This is because homes tend to shift and flex over time, and a flexible material will allow the insulation to move and flex with the home to avoid gaps or cold spots developing.

For more information on the best cavity wall insulation new build for your home, get in touch with our team of friendly experts and we can talk through the options available to you. Our experienced surveyors can help determine which solution is right for you, evaluating your needs and helping you to achieve the best possible energy savings with a minimum of fuss.