November 10, 2021

Cavity Wall Insulation: Everything You Need To Know

Cavity wall insulation exists to improve your home’s energy efficiency. Continue reading to discover more about cavity wall insulation, including the associated costs and advantages.

Cavity walls account for up to 35% of heat loss in the typical UK house, resulting in increased energy costs as central heating compensates for the heat loss.

Known as a cavity wall, many houses constructed after the 1930s feature two walls with a space between them. This was done to keep rainfall out, but it also means that heat may escape between the two walls.


What is Cavity Wall Insulation, and how does it work?

Mineral wool and other insulating materials are used in cavity wall insulation. It is put in your house by drilling tiny holes in the outside walls and blowing the material into the space until it is completely filled. It works by trapping air in a cavity that has been sprayed or injected with insulating material. The materials aid in the trapping of warm air while also inhibiting air circulation, reducing heat loss via conduction and convection.

Mineral wool is also available as slabs that may be used to fill a hollow wall partly or completely. PIR (Polyisocyanurate) and Phenolic boards are two more options.


How can I know if I have a Cavity Wall in my house?

There are three techniques to check for cavity wall insulation in your house.

The first step is to determine how old your house is. It’s doubtful that it had hollow walls if it was constructed before 1930. Cavity walls were most often used in homes constructed between 1930 and 1980. Finally, hollow walls are more likely to be found in homes constructed after 1980.

Examine your brickwork as a second option. If all of your bricks are put lengthwise, you most likely have a hollow wall. You probably have a solid wall if there are full-length and half-length bricks.

The third way is to take measurements from a window or door on your outside walls. If the thickness of the wall exceeds 30cm, it is most likely a cavity wall. If your wall is less than 30cm thick, you most likely have a solid wall.

When you get a quotation from a competent cavity wall insulation firm, they will come to your house and determine what sort of wall you have.


What are the signs that Cavity Wall Insulation has been installed?

Look at the bricks on the exterior of your house to check if there are any little holes that have been covered up. The insulation was blown in at this point.

If the repair was done by a provider that offered a guarantee, you should have received this papers when you bought your home. If it does have a warranty, but the documentation has been misplaced, you may get a fresh copy from GIGA for £25.

A drill test is another method to tell. This may be done for you by a professional installation. You can check whether or not insulation has been put by drilling a tiny hole in your brickwork.


Is it possible for cavity wall insulation to get damp?

Because cavity wall insulation repels water, it should not get moist. Some houses, however, will not be appropriate for cavity wall insulation if they are prone to rain caused by the wind and have damp issues. Before this kind of insulation can be placed, the damp issues in the property must be resolved.


How much does it cost to insulate a cavity wall?

The cost of insulating cavity walls varies substantially depending on the size of your property, the materials used, and the amount of time it takes.


Do I Need Planning Permission to Insulate Cavity Walls?

Cavity wall insulation normally does not need planning clearance. Only if the insulation would modify the look of your home’s exterior, or if you reside in a listed building or a conservation area, will you need to contact the planning department.


What Should I Look for in a Cavity Wall Installer?

Check with the Cavity Insulation Warranty Agency to see whether your installer provides a 25-year guarantee (CIGA). The National Insulation Association UK (NIA) or the BBA should both be registered with the firm (British Board of Agrement) Each organisation has its own code of professional conduct.

You may find an installer on CIGA or NIA’s websites, as well as consumer sites like Which? You may also seek closer to home by searching for cavity wall installers in your area.


Is it possible to acquire a grant to insulate your cavity walls?

Cavity Wall & other types of insulation for your home are available under the ECO3 government grant. If you are a homeowner in receipt of government benefits you may be eligible for free or heavily subsidised cavity wall insulation for your home. In some cases you may be eligible with other criteria under the flexible eligibility scheme. Use our short form to check your eligibility.


Is it possible to remove the insulation?

Yes. It is feasible to remove the insulation from the cavity walls. If the insulation is formed of mineral fibre, a strong vacuum may be used to remove it. Other forms of insulation must first be dismantled. This is accomplished by removing some brickwork, using special technology to break down the insulation, and then sucking it out until it is entirely clean.


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