When is cavity wall extraction needed? - SPMS WALES
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When is cavity wall extraction needed?

08 Jun When is cavity wall extraction needed?

Cavity wall extraction is the process through which any cavity wall insulation is completely removed. There are a few signs to look out for when cavity wall extraction might be required at your home. Damp internal walls, staining, condensation and black mould are all things to look out for which could mean extraction is the only option remaining.


Some of the oldest cavity wall insulation in the UK is thought to be around 25 years in age – meaning that although it may have been installed correctly at first, time has seen some of that insulation slump, leaving cold spots which can result in condensation. Alternatively, and perhaps more worryingly, some more recent insulation jobs are reported to have been completed poorly and as a result, problems have started to surface.


So what exactly should you look out for if you need cavity wall extraction?



When cavity wall insulation is installed improperly or begins to fail, it can cause increased moisture within walls. This can also be caused if the insulation gets damaged by flooding or, if the affected area experiences large amounts of wind driven rain, water can breach the cavity wall and cause the plaster to blister and crumble – so be aware of any damp areas.



As a result of the damp that can occur, mould can be a very serious side effect and, if left untreated, can cause serious health and safety issues for occupants. In this instance it is best to extract the cavity wall insulation, treat the mould that is in the structure and then re-insulate properly.


Timber or steel framed buildings

Unreliable builders may wrongly install cavity wall insulation when a property has timber or steel frames. These frames are not able to accommodate cavity wall insulation and this can result in rot, damp and mould. In these cases, cavity wall extraction is the only option. If you have a timber or steel framed buildings, there are other insulation alternatives that are more suitable, and which should be used in the first instance.


Old insulation

Older forms of cavity wall insulation can be both dangerous to an occupant’s health and also very ineffective as an insulator, so there is virtually no benefit in keeping it. Full extraction is the best course of action recommended in this instance too.



If insulation has been installed poorly with incorrect drill patterns or blowing pressures it can leave sections of the wall that are uncovered. This can lead to condensation when the warm air in the house meets the coldness of the poorly insulated areas of the property.


In short, having any faulty cavity wall insulation extracted not only prevents problems like these from getting worse, it also gives occupants the opportunity to have their cavity walls insulated properly so that they can experience all the benefits having a well insulated home brings. One solution for re-insulation post cavity wall extraction is Aerotherm. This material is extremely thin at 1mm thick, and effective saving up to 35% energy when you are heating your home. It is easy to install, very durable and causes very little disruption when it is installed in your home. This technology allows you insulate your home with the most value-per-inch when compared to other insulation techniques.


If you have any questions regarding cavity wall extraction, Aerotherm or what other services might be available to you, call 01656 818881 or send an email to spmswaleslimited@btconnect.com to see what we can do for you.