In recent years, due to government campaigns and free offers, more and more homeowners have been having wall cavity insulation added to their homes. In most cases this is a welcome addition that can save a homeowner as much as £275 per year according to the Energy Saving Trust. But in some cases, it has been shown to cause damp and mould problems and it may even need to be removed.
What is cavity wall insulation?
Most homes are constructed with exterior walls that have a gap between the outer brick and the inner block. This air gap can promote heat loss from the inside and wall cavity insulation is designed to fill this space. Usually an insulation material is pumped into the space – a job that should be done by experts to ensure that it no gaps are left and that your home is suitable.
Does wall cavity insulation cause damp problems?
Not always, but if it has been incorrectly fitted or your home is not suitable, it can lead to problems. The consumer company Which? carried out an investigation into wall cavity insulation problems a few years ago and they discovered that some homes are not suitable, but that some installers were not aware of the problem. If your home is affected by the following this may not be suitable for you:
Your outside walls are affected by driven rain or regular rainfall – this applies to certain parts of the UK where wall cavity insulation should not be fitted at all.
Your home is in an unsheltered position and not protected by other houses or tree cover.
Your brickwork is in poor condition with cracks or blown grouting or render.
If these issues affect you, water could penetrate the outside walls of your home and literally soak the insulation. This is then transferred to the inner walls of your home causing damp and mould. The only solution at this stage is to have the insulation completely removed, the outer walls repaired and the insulation re-installed – a lengthy but effective solution.
Should I avoid wall cavity insulation?
Not necessarily. If your installer understands the risks and is able to correctly assess your home, then this type of insulation can be effective. You should check to see that your installer is a member of a body such as the National Insulation Association as this will reassure you that they understand and can assess your home for suitability.
If your home has been built in the last ten years you probably already have insulated walls and therefore won’t need to concern yourself with this at all. In all cases, loft insulation is a universally great idea – so don’t skimp on that.