Is your home showing symptoms of failed cavity wall insulation?

Symptoms of failed cavity wall insulation

There are many tell-tale signs of a weakening cavity wall insulation, and these could be appearing right under your nose!

We have put together a list of the most common symptoms of failed cavity wall insulation that we tend to come across on a daily basis. If any of the following symptoms are diagnosed, we strongly suggest that the customer considers cavity wall insulation removal.

Damp Walls

Discoloured or cold patches on your walls, or even a musty smell in your home, could be a sign of a failing cavity wall insulation. This is a result of moisture seeping in from the outside. This can happen because your external walls are losing their ability to repel water, or even severe weather conditions in some cases. The water is then soaked up into the cavity where your insulation lives. Your insulation then absorbs the moisture and transmits it onto your internal wall, causing the damp!


Sneezing, coughing, headache? Don’t blame a cold, blame the mould! Did you know that mould is a symptom of a failing cavity wall insulation? Well, you do now! Mould is a fungus that thrives in damp conditions, i.e., the cosy little moist top right corner of your living room where the cavity wall insulation is conveniently damp. If your house could speak, it would beg you not to paint over the mould. Instead, how about identifying the source of the mould? A borescope inspection could help with this, and once you find the source, a cavity wall insulation removal could be your home’s medicine!

Cold patches on your walls

If you find yourself feeling a little colder in a certain part of your house, give the walls a feel! Cold walls don’t always mean there’s dampness in your cavity, it could also mean your insulation is clumping, or you have saggy insulation (it’s about as nice as it sounds). An inspection of your cavity using a borescope can quickly diagnose these problems, bringing you one step closer to curing your home through extraction!

Expensive heating bills

Have you noticed you may be paying more on your heating bills? This is another symptom of your cavity wall insulation’s deteriorating health. Your boiler and radiators are working overtime to try and warm your house up, the heat wants to escape, and your insulation is allowing it!  If your insulation can’t even hold itself up, then there’s no chance of it holding your heat in. Don’t crank your radiators up, your bills will go through the roof (much like the heat). Instead, maybe it’s time to start thinking of cavity wall insulation removal.

Cracks in the render or brickwork

Imagine this symptom as your house ageing prematurely. The walls of your house are its skin, the outer and inner walls being the different membrane layers. What holds the structure of skin? Collagen, or in your house’s case, the brick ties in the cavity. If your cavity wall insulation is wet and sagging, or clumping around these brick ties, they will begin to rust and expand before their time! This will cause the render or brickwork of your house to crack, and these cracks are sooo noticeable. How about applying some moisturiser… sorry we mean some cavity wall insulation removal?

Blown plaster

Uh-oh! Is the plaster coming off your internal walls? Water may be beneficial for your health, but not much can be said for your house. You may find that the moisture your cavity wall insulation is desperately clinging to is the perfect bridge for the damp from outside to travel across and ruin your beautifully plastered kitchen, because, you see, the poor plaster on the inside of your house is vulnerable to moisture and won’t last very long when its exposed

Blocked vents

Yet ANOTHER way for failing cavity wall insulation to cause damp and mould in your home! Have you noticed your house feeling less airy than normal? This could be because your cavity wall insulation has sagged and blocked your vents. That’s not the only kind of vent it can block, it can block the vents to your suspended floor, or even block your combustion vent! This will prevent excess CO2 produced from the gas fire in your living room from leaving your home.

A quick recap...

Can you see your own home in these symptoms? If the answer is ‘yes’, you may be putting your family and property at risk by letting these symptoms worsen, cavity wall insulation removal could be the miracle cure you’re looking for, after all, you know what they say, “No insulation is better than wet insulation”. Be the hero your household needs, and start your house’s road to recovery by booking a survey and getting a free quotation for cavity wall insulation removal today!

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