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How is my failed cavity wall insulation removed? (Professional guide)

Having your cavity wall insulation removed is a commitment, which is why this article is dedicated to exploring and clarifying the process of cavity wall insulation removal, for your benefit! After reading our article, you’ll know the ins and outs of how your cavity wall insulation is removed, if you can remove it yourself, signs that your cavity wall insulation should be removed, and you’ll find a brief summary of its cost at the end. This article runs through the methodology our experts follow to ensure you, our valued customer, are provided with the most accurate information and reassurance whilst having your cavity wall insulation removed.

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What is a cavity wall?

If you have a cavity wall, this means the external wall of your home actually consists of two separate walls with a gap of about 75mm between them, hence, the cavity. The purpose of your cavity wall is to provide extra layers between the inside and the outside of your home, preventing entry of cold, and damp into your home while still allowing proper ventilation, it is your home’s protector, if you like. If your home has had cavity wall insulation, this means an additional layer has been added to protect your home, usually with materials such as, polyurethane foam, mineral wool, and carbon beads with a bonding agent. Sounds like a fantastic idea, right? Adding extra protection from the outside? Wrong. There are many ways in which your cavity wall insulation can fail and therefore require removal…

How to know if your cavity wall insulation needs removal

If you’ve read any of our other articles, you’ll be well accustomed as to why your cavity wall insulation should be removed and how to know when it needs removal. Not read our other articles? Not to worry, we’ve got your back! Allow us to explain, if your cavity wall insulation is failing it is highly recommended you have it removed. How will you know if its failing? That’s easy! A failing cavity wall will show sooo many symptoms that are pretty obvious when you know what to look for. Some of the symptoms are:-

• Increased heating bills
• Damp or mould growing on your internal walls
• Cold patches on your wall
• Cracks in your brickwork or render

For a full summary on the symptoms to watch out for, why not visit our article Is your home showing symptoms of failed cavity wall insulation?

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Can I remove my cavity wall insulation myself?

Unfortunately, the answer is no. The removal of your cavity wall insulation is rather a complicated, strenuous process with some heavy machinery, that needs to be performed by trained professionals like we have here, at First Choice Energy Ltd.

How do you remove cavity wall insulation at First choice Energy Ltd?

STEP 1

To begin with, suction holes are drilled around your house, most likely around the bottom of your cavity wall (these are the holes your cavity wall insulation will be sucked out of).

STEP 2

After that the smaller air gun holes will be drilled strategically around your home (these being where the air gun will enter to loosen the insulation from various locations around your home).

STEP 3

The cavity wall insulation around the suction holes will be extracted first to ensure that the walls don’t get clogged up with all of the insulation from around your property. The air gun’s then inserted into the air gun holes and is turned on safely to release pressurised air from our compressor into your cavity walls, this then loosens the damaged insulation and blows it towards the suction holes for extraction.

STEP 4

This process is performed all around your home, sometimes repeating holes to ensure the whole cavity is clean and clear of any insulation. The old insulation then travels along the extraction unit to its end, where it is removed and bagged for appropriate disposal as per its manufacturers guide.

STEP 5

An inspection is then performed on the inside of your cavity wall using one of our borescopes to ensure all of the cavity wall insulation is removed.

STEP 6

To finish, our team will clean up any mess that was made, fit in airbricks to your external walls, to ensure proper ventilation for your cavity wall, and fill in any holes that were drilled into the walls. You’ll never know we were there! Apart from the fact that your home will be finally cured, of course.

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How much does having your cavity wall insulation removal cost? Is it worth it?

A simple answer would be, yes, it most definitely is! A slightly more complicated answer would still be yes; however, it would require a bit of explaining so here goes…


The cost of cavity wall insulation removal does indeed depend on the size of your home and how many faces of your property requires cavity wall insulation removal. For example, a small job could be if you wanted the removal of one face of a semi-detached, 2 bed bungalow. The cost of this would range around £1,500.


Whereas a more medium sized job, let’s say all available faces of a 4-bedroom, semi-detached house would cost you more around £2,500 to £3,000 and for a large job, so all faces of a 5 bedroom, detached house, this would cost around £5,000.

A quick recap...

Our goal for this article was to make sure that you, the all important homeowner, are one hundred percent certain of the cavity wall insulation removal process. There are few worse things than anticipating the unknown and wondering if your hard-earned money is going to good use, especially when it’s your home at stake. That’s why here at First Choice Energy, you will never be in the dark, you are our priority. Is it time for you to have your insulation removed by our trusted professionals?

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We help families around the UK to live in an energy efficient homes through the use of insulation and installing eco-friendly boilers. We provide boiler grants as well as cavity wall insulation & extraction.

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