Frequently Asked Questions

  • Q. How do I know the walls are full?
  • A. Each system has a defined pattern of holes, which has been tested to verify that it results in a complete fill. Most systems have an automatic cut out, which actuates when the adjacent wall area is full. There is tolerance in the injection pattern so that the material will flow past the next injection hole.
  • Q. Is the insulation dense?
  • A. No, as the insulation is contained within a masonry wall, it doesn't need to be 'dense'. For insulation and other purposes, a light density is better. Before installation, the technician will undertake a quality test to ensure the insulation will go into the wall at the right density. He will also note the amount of material used, to know that sufficient insulation has been installed.

    Note: Drilling a hole in the outer wall and testing the cavity fill with a rod or pencil will not provide any meaningful information.
  • Q. What about the ventilators that are in the external wall?
  • A. Ventilators supplying combustion air to fuel burning appliances must be safeguarded. Similarly, ventilators at ground level that ventilate below timber doors must be safeguarded. The technician will investigate them to check they are already sleeved. If they are not, the technician will remove them and seal around them to stop them being blocked by the insulation. Other vents, which may be redundant, such as cavity vents or vents that are used to supply air to open fires in bedrooms may be closed off. The technician should discuss these with you. Redundant airbricks may be filled.
  • Q. What about filling holes?

    But my house has painted areas?
  • A. The technician will fill all the injection holes with mortar to match the existing as closely as possible. He will use a mix that closely matches the existing colour and texture. On pebbledash finishes, he will apply pebbles to the surface to match the existing finish. After weathering, the holes are difficult to see.

    Normally, we paint the injection holes. Unfortunately, even if the original paint is used, it may not match due to weathering. So it may be necessary for you to consider painting the area, after the mortar has dried.

    You should discuss and agree what will be done with the surveyor.
  • Q. Do I apply for the CIGA 25 year guarantee?
  • A. No, we will submit the guarantee application. The guarantee is posted to you direct from CIGA. Keep it safe

    CIGA is a non-profit organisation; its only 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.

    All professional approved installing firms are members of CIGA and can apply for a CIGA guarantee, for properties built with traditional cavity walls. You should insist on a CIGA guarantee, since nothing else can give you the level of assurance to which you are entitled.
  • Q. Will my house be warmer?
  • A. 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 the room with the thermostat. However, you should find that the temperature in other parts of your house improves, for example the small bedroom on the corner.
  • Q. Are there any maintenance or servicing requirements?
  • A. No, to the cavity wall insulation, but normal building maintenance is needed.
  • Q. How long will the insulation last?
  • A. For the life of the building - the British Board of Agrément say so.