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 which cannot be insulated as well as a cavity wall. Cavity wall insulation simply fills this gap between the two walls allowing for a more insulated, sound proof and robust structure. The walls that make up the surrounding property are important to be well insulated as they can leak heat in winter and provide inefficient cooling systems throughout summer.
Eco-Spray Systems has multiple products that can insulate your cavity wall, from Icynene spray foam insulation to thermabead, we are able to apply high quality products to your properties.

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Cavity Wall Insulation Products

Spray Foam insulation

Icynene spray foam insulation is an advanced solution that can provide drastic heating and cooling insulating properties. You also have the choice between open-cell or closed-cell spray foam application which can distinguish what type of insulation you are looking for.


Thermabead is an insulator that is only applicable to cavity walls. It is a traditional method of insulation and has been widely used throughout. It is one of the more common methods and has proven to be successful. Through either internal or external applications.


Blown mineral fibre is an entirely dry insulator for cavity walls. This solution has an array of benefits such as simplified planning, speed of installation and it is also one of the more cost-effective insulation methods. Additionally is a eco-friendly alternative to the likes of copper cables.

Cavity Wall - Do you have one?

There are a few procedures that you can do yourself to check if you have a cavity wall, however, if you are still unsure, you can contact us and our professional can provide informative and detailed information for your property and recommend the correct products. Below details a few measures you can take to first assess you wall, however they are only indications, if you are in doubt it is best to consult a specialist such as Eco-Spray Foam Systems.

  1. If all the properties walls appear to be the same length.
  2. Most houses built after the 1920s have cavity walls.
  3. Brick layout pattern is even.
  1. If the brickwork is more than 260mm thick.
  2. Narrower walls are usually solid and not cavity.
  3. If the length of the bricks follow a similar size.

Did you know that heat loss is most common through walls?

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Cavity Wall Insulation - Facts

  1. Cavity wall insulations act as a major contributor to reducing carbon emissions.
  2. Up to a third of all heat is lost through walls.
  3. Cavity wall insulations can cut heating costs up to 35% with high quality insulators such as Icynene spray foam.
  4. Over the average life of a building, with cavity wall insulations you can save more than 1 tonne of carbon dioxide.
  5. Spray foam insulations for your cavity wall last the lifetime of your home or property.
  6. Specialists can easily apply the cavity wall insulation via internal or external injections, depending on the construction.

Spray Foam Insulation for Cavity Walls

EcoSpray-Foam Systems highly recommends the use of Icynene spray foam insulation for cavity walls as this product shows an array of benefits. For example, the spray foam acts as a water barrier, preventing mould growth and doesn't let water reside within. The flexibility of the spray foam also provides a great benefits for being able to completely fill the cavity, leaving no gaps for heat loss, sound penetration or water absorption that will lead to mould growth. Additionally, spray foam as an insulator, also provides structural strength, expanding 100s of times until it fills the cavity. The benefits of using spray foam products for cavity walls also includes providing a sound barrier enhancing indoor qualities for you to work or rest.

Cavity Wall Diagram

This image is a replica of a cavity wall. Insulation sits fills the middle (a.k.a the cavity) and acts as a barrier from external to internal. You can see from the pattern of the wall that the bricks follow the same direction, as mentioned previously. This is one method of defining a cavity wall. Additionally, the bricks are of the same or similar length, this is another indicator that shows the wall to have a cavity.

Cavity Wall Diagram

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