Cavity Wall insulation Removal

Cavity wall insulation can provide you with an effective way to reduce how much you spend on heating but it doesn’t always work. Where the insulation material has been poorly chosen, the insulation hasn’t been installed properly, or property damage has occurred, insulation may need to be removed.

Insulation that is no longer working optimally means that you’re not getting the benefits that you’ve invested in. However, the damage that poor insulation can cause can actually be far worse. When insulation absorbs water, it can lead to damp and mould in homes and if left unchecked result in structural damage to the property too.

It’s an issue we’ve been tackling for over 20 years and as a result, we’ve become experts in the area. Our expert teams can effectively and quickly remove the inappropriate cavity wall insulation and offer the advice you need to remedy any further issues you may experience.

Why does cavity wall insulation need to be removed?

There are numerous reasons why cavity wall insulations fail and its often association with the insulation becoming damp. Your cavity wall insulation may need removing if:

  • There are voids within the cavity that aren’t filled with insulation
  • The density of insulation was not correct when installing
  • The cavity wasn’t professionally cleared before installation
  • The material has soaked up and is retaining water
  • Your property wasn’t suitable for cavity wall insulation
  • The insulation material is not long-lasting and has become worn
  • Damage has occurred to the walls of the property

Using the right materials and adhering to professional standards significantly reduces the need for cavity wall installation to be removed. But where it does become necessary, Extract Insulations has a wealth of experience tackling the problem.

Some Materials stand the test of time, other like fibre do not:

  • Urea formaldehyde foam deteriorates over time causing the foam to shrink and cause voids in the insulation. In the winter months, stains may appear on the walls and high levels of humidity can cause condensation and mould to grow.
  • Fibre has been proven to absorb water. While the material is water resistant, it is not waterproof. Soaking wet insulation caused by wind driven rain has been found throughout England & Wales. Mainly since the storms of 2012/2013 and recent flooding.

Whatever kind of problems you have, whether it is an incorrect install, deterioration, voids in the cavity or wet insulation, we have the perfect solution for it. We can provide you with an effective process of Cavity wall insulation removal that will be ensured to bring positive results.

How does Extract Insulation remove cavity wall insulation?

We use industry leading equipment and technology to safely and efficiently remove your cavity wall insulation without causing any further damage. Our highly qualified teams are trained to follow best practices to ensure their work is always completed to a high standard.


  1. We undertake a thorough survey of your home, including the condition of your external and internal walls and any existing areas of damp. We can then let you know how much it will cost to clear your cavities.
  2. We prepare the site and erect scaffolding if necessary.
  3. We create 5 – 10 openings at damp proof level in the external wall by removing bricks at predetermined distances.
  4. We fix specially designed extraction covers to the openings and attach an extractor.
  5. We drill a series of holes in the mortar line or render and use air pressure to force the insulation materials down to the extractor.
  6. We inspect the cavity at regular intervals throughout the extraction using a 360o video boroscope that gives us a 2m view in every direction.
  7. When the extraction is complete and we’ve confirmed all the cavities are completely clear we reinstate the walls and return your home to its original state.
  8. We clear and clean the site.
  9. We carry out a final inspection of your property.
  10. Our technician fills out and signs a completion certificate, which we ask you to sign as well.

Delivering continued support

If you need additional advice after you’ve planned your cavity wall insulation removal, the team Extract Insulation can still help you. Whether you want advice on how to tackle the damp that poor insulation has caused or you want to understand how our services can provide quality cavity wall insulation that won’t fail, you can contact our team.

If you have concerns about your existing cavity wall insulation, our professional team are on hand to offer advice now.

Some questions you might have

Here at Extract Insulation, we know that deciding to undertake work on your property is a complex one. We regularly handle queries from a range of customers, including these frequently asked questions.

Why would you remove cavity wall insulation?

There are many reasons why the insulation in cavity walls may be removed.

In some cases, it may be installed incorrectly or a property may not have been suitable in the first place. It’s also possible for damage to cause problems with the insulation, such as damage occurring to the external brickwork

Many problems with insulation stem from the insulation becoming damp. This not only means you don’t receive the maximum benefit of the insulation but it can cause further issues to. Properties that need their cavity wall insulation removing are likely to experience damp and mould inside, for example.

What are the signs of failed cavity wall insulation?

Penetrating damp and mould are the main signs that you should contact a professional to assess your existing cavity wall insulation. You may also notice that your home is experiencing more heat loss, although this will be gradual and remains overlooked by many property owners.


Is it possible to remove cavity wall insulation?

Yes. We can remove cavity wall insulation if necessary, whether you would like it replacing or simply removing. Following a thorough assessment of your home, we use a variety of techniques to remove the insulation depending on a variety of factors, such as your property type and the material used.

The methods we use are safe, causing no damage to the structural integrity of your property.

Is it possible to assess existing cavity wall insulation?

Yes. We use leading technology and equipment to gain a clear assessment of your existing cavity wall insulation, including using thermal imagery surveys, allowing us to make recommendations you can rely on.

Is cavity wall insulation suitable to all properties?

No. There are some conditions that means cavity wall insulation is not always suitable for a property. For this reason, we always carry out extensive assessments before recommending the right service to you. Having cavity wall and loft insulation installed when it isn’t suitable for the property can cause a range of issues, such as damp or structural damage.

The property may also affect the type of materials that can be used to fill the cavity.

How much does cavity wall insulation removal cost?
The costs for cavity wall insulation and removal vary considerably from project to project, property to property. We provide general guidelines as to typical rates over on our ‘The Costs of extracting CWI’ page. For a full and completely free from obligation chat about how much your cavity wall insolation project may be get in touch with the team. Head on over to our contact page, call them on 0239 388 0032 or email them via
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If you want to discuss one of the services we offer or would like to arrange an inspection, you can speak to our expert team today. 

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