Cavity wall insulation problems

Cavity wall insulation is a great heating solution, but it can also cause your home more harm than good. Read on below to learn key steps you need to take before committing to Cavity Wall insulation in your home.

What is a Cavity Wall?

Most homes built after 1920 were built with two layers of wall, leaving a ‘cavity’ between the outer and inner walls. Cavity Insulation involves injecting insulation material into the void which forms a barrier that protects your home from heat loss, regardless of fluctuations in weather. Most homes with cavity walls will benefit from cavity wall insulation, but problems can arise when the property has not been surveyed correctly or the insulation not installed to compliance standards.

Before choosing to install Cavity Wall insulation, it is important to consider whether it is right for your home. Not all homes with cavities are suitable for cavity wall insulation so it is important to find a reputable company to carry out a qualified survey before committing to installation.


If the property is not surveyed correctly, and installation does not comply with industry standards you may experience ongoing issues. Here are some things to look out for;

  • Existing problems in your home due to penetrating damp (not to be confused with condensation)
  • Your home is in an exposed location which risks water entering the cavity. It is important that dampness cannot be transmitted from the outer to the inner wall, if water is in any way penetrating the cavity it is recommended not to install Cavity Wall insulation.
  • Mortar between bricks is in bad condition
  • Walls contain existing forms of insulation which may not be compatible with new insulation.
  • Rubble in the cavity
  • Air bricks are not sleeved (qualified surveyor or contractor should check this)
  • Cracks in the walls

It is not uncommon for contractors to recommend minor work is carried out on your home before installing cavity wall insulation. This is not to say that you should not get cavity wall insulation, it is very unlikely you will experience any problems if your home is surveyed correctly and the work is carried out by a reputable contractor. They should be able to answer any queries you may have and be knowledgeable about the particular system they use.

Thank You for your interest in insulation

Please fill in your postcode below and take our multi choice questionnaire to see if you qualify for any government grants, cash-back schemes or subsidised installations. Our team will then be in touch with you as soon as possible.

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What does your wall most look like? *

How many bedrooms in your home *


Cavity Insulation *

Do you have cavity wall insulation

Loft Insulation *

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