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Cavity Insulation   How is cavity wall insulation installed?  
Contact Us   The cavity wall is injected with insulating material by drilling holes in the external wall, approx, 1.5m apart, through the mortar joint. Holes are generally of 22-25mm diameter and are ‘made good' after injection. Each hole is injected in turn starting at the bottom.  
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Employee Log In   How long does it take?  
   

Cavity wall insulation normally takes around two hours to install, but the time does depend on the size of the house and other factors, such as access.

 
    Who will install the insulation?
 
    At Nationwide we only instruct reputable and professional insulation firms - all of whom are BBA Approved and members of CIGA. After a surveyor has been out to asses your property he will recommend the most suitable firm to you.  
    Do I have to do anything before the insulation?  
    The drilling process does create some vibration; it would be wise to remove ornaments from external walls and window ledges, for their safety and peace of mind. If possible keep pets indoors during the insulation.
The technician will need access to all walls, so he will need to get inside attached garages, lean-to sheds, conservatories, etc. The insulation can only be really effective if all walls are done. If you have a wall right on the boundary, you may like to mention to your neighbour, that the Technician will need to go onto their property and it is sensible to obtain their permission before we start work. 		 
    Is there much mess?  
    The drilling process inevitably creates a little dust, which will be cleared at the completion of the job. It may be wise to remove vehicles from the drive and things close to the walls. This will also give the Technician better access for equipment and tools. Remember to warn the neighbours and ask them to keep their windows closed during the process. Take washing in!  
    Do I apply for the CIGA 25 Year Guarantee?  
    No, the insulation firm will submit the Guarantee application. The Guarantee is posted to you within a few weeks of the application being received by CIGA – keep it safe.
CIGA's main function, is to stand as guarantor for the promises set out in the guarantee. It has the resources to meet the promises made in the guarantee.
We only use professional approved installing firms which are members of CIGA and can apply for a CIGA guarantee, for properties build with traditional cavity walls. You should insist on a CIGA Guarantee, since nothing else can give you the assurance you are entitled to.		  
    Will my home be warmer?  
       Yes – if your heating is not controlled by a thermostat. However – if you have a thermostat, it will cut out the heating at the same temperature, so you may not notice the difference in a room with a thermostat. However. You should find that the temperature in other parts of your house improves, for example, the small bedroom on the corner.
With CWI, you should find that the house holds its temperature for longer; therefore the time between heating cycles may be longer. The result should be a more even temperature throughout the house and/or a reduced fuel bill.		  
    Are there any maintenance or servicing requirements?  
    No, not to the Cavity Wall Insulation, but normal building maintenance is needed.  
    How long will the insulation last?  
    For the life of the building – the British Board of Agreement say so.