Gov UK Grants -Cavity Wall Insulation Grants

Gov UK Grants -Cavity Wall Insulation Grants

Having problems with your walls since having Free cavity wall insulation fitted as part of a government scheme?

Are you thinking about having your cavity wall insulation extracted?

This blog is to help you decide whether you may need to have an extract and refill of your insulation.


Failed Cavity Insulation

Cavity Insulation Removed

Cavity insulation is not 100% foolproof and there are times when it needs to be redone.

Some materials used in the past were inferior or not fitted correctly which are now causing problems for home owners.

Luckily many installations carried a 25 year warranty, so you may be able to claim on this for its free extraction and refill.


Mineral Wool Cavity Wall Insulation Problems


The most common type of insulation that seems to give most people problems is mineral wool.

This seems to be mainly due to poorly fitted insulation by the installing companies who are incentivised by doing as many as possible on the government free schemes without a thought for quality. 

Many of these companies will be short lived and so will not be honouring any waranties.

When insulation isn’t correctly fitted and you’re left with gaps within the cavity where you have no insulation and you get cold bridging.

Damp penetration – The most common problems with cavity wall insulation tend to be related to moisture penetration across the cavity which can lead to damp staining, damage to joinery






Free Cavity Wall Extraction Grants


Cavity Insulation Removed

You would be glad to know that there are grants available for this service, which will help you pay the hefty extraction bill that could be headed your way.

With ECO4 on the horizon, there is even more funding available for heating and insulation upgrades.

So please feel free to contact one of our specialists here at Warm Front UK for more information…


Top 5 Cavity Wall Insulation Problems



If your cavity wall insulation is wet or defective, this can eventually lead to some nasty bills. You will have mould problems and redecorating costs.



Wall ties play an essential role in holding the structure of a property together.

When cavity wall insulation becomes wet, it will eventually sag and clump around a wall tie.

Seeing as most older wall ties are galvanized steel, they’re prone to rust and corrosion.

To avoid any structural damage to your property, these ties must be replaced which typically costs £1000 to £1500.



It is likely that your rendered wall would have cracked as the wall ties begin to swell, so not only will you have to pay out on wall tie replacement but potentially the cost to re-render your property. This could cost you an excess of £2500.



Another subtle cost that you could incur if your cavity wall insulation is failing is a rise in your heating bills.

Most fail to notice this, but as your insulation deteriorates, it becomes easier for heat to escape your property.

This results in you having to use more gas and electricity to heat your home.



Cavity Wall Insulation
Cavity Wall Insulation


Finally, if water does manage to ingress from the exterior to interior wall it will eventually work its way into the gypsum skim on your wall.

As moisture works its way into the plaster, the plaster will lose its adheration to the wall and blow.

Whilst the cost to repair this might be relatively low, £100-£300, unfortunately it is a recurring cost. Until the source of the problem is resolved, this cycle will continue.





is it worth having cavity wall insulation?

The results

A warmer home – more than a third of heat lost from an uninsulated home escapes through the walls, and up to a quarter through an uninsulated loft. Having the walls insulated will ensure your home remains warm without the need to turn on your heating.

Reduced Bills – not only will you benefit from a warmer home for you and your family, you could save between £90 to £270 per year depending on your property type and size. A loft insulation could also save you up to £65 a year.

Doing your bit for the environment – with an increasing pressure on households to reduce their carbon footprints, homes with cavity wall insulation will be reducing the amount of energy used to heat the home as well as their carbon footprint.



Health effects of failing cavity wall insulation. 



Many of those who have had cavity wall insulation insulation installed in their home across the UK have experienced some side effects.

This is likely due to the use of the wrong insulating material on the property.

Over the years, the insulation has sagged and become a perfect bridge for moisture to ingress from the exterior wall to the interior wall.

This has then developed into damp & mould.



When thinking of damp and mould, most only tend to acknowledge the physical symptoms such as tidal marks on walls, blown plaster and blotches of black mould.

However there is a lot more than what meets the eye, damp & mould can have an adverse effect on your health.

Mould actually produces allergens, irritants and, sometimes, toxic substances which are far from ideal.

Inhaling these toxic substances can cause congestion, itchy/red eyes, blurry vision, Sore throat, coughing and headaches.

The truth is that all this could have been avoided if the correct insulative material was used in the first place.

Unfortunately, if you’re experiencing damp and mould resulting from your cavity insulation then extracting the defective insulation should be a priority.


Upgrade to more efficient insulation.


Did you know that mineral wool and polyurethane foam deteriorate over time? It comes as a surprise to most, but the insulation that currently resides in your cavity wall is likely clumped and sparse.

Aside from all the damp and condensation issues that can arise from this type of defect, the insulation is no longer retaining heat at the level it should be.

Given that 35% of all heat generated by a home is lost via your walls, it’s probably a good idea to have efficient insulation in place.

This wont only make your home warmer, it will also reduce your energy bills.


Do You Have Cav Insulation Over 25 Years Old?


We advise that if your cavity wall insulation is 25+ years old then it is probably worth your while having an insulation survey.

From here, the survey can assess the state of your current insulation and make recommendations on an upgrade.

It’s worth bearing in mind that cavity wall insulation has come a long way since the late 90’s.

Not only is the insulative performance of the material much better, but also the durability, breathability and resistance to water damage have drastically improved.


New Materials Used


The latest, and most efficient cavity wall insulation is the carbon bead and adhesive combination. Boasting a thermal conductivity of 0.033, this makes for an excellent upgrade to your current insulation. In fact, any standard fiber insulation (such as mineral wool) is 24% less efficient than carbon beads.



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