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Cavity Wall Insulation

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What is Cavity wall?

Cavity walls consist of two ‘skins’ separated by a hollow space. The walls are commonly brick or concrete block. This typical cavity wall construction was introduced in the UK from around the 1930’s and by the 1990’s cavity insulation became compulsory in the UK building regulations. so knowing the age of your home is the first useful step in figuring out if you have them. If your home was built after 1930 then it’s highly likely you have cavity walls.

  • House stock pre 1930 – solid wall construction.
  • House stock post 1930 – Cavity walls slowly introduced.
  • 1970 onwards – Possible chance of insulated cavity.
  • 1990 onwards – Compulsory cavity insulation as per building regulations.
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How
Cavity Wall Insulation Installed ?

Firstly an experienced Elite Impact surveyor will visit your property to survey and confirm that it is suitable i.e. in good condition, has wall cavities that can be filled and that your property is not in an area designated as suffering from windblown rain.

To insulate your cavity walls, our experienced accredited contractor or approved installer will drill small holes around 22mm in size at regular intervals (around 1m) on outer walls through the mortar joint between the bricks. Using specially designed equipment, they then blow insulation into the cavity. The installer will make sure that an even pattern is used across the face of the wall and that the highest hole is no more than 30cm from the top of the bricks. This ensures that the cavity is filled evenly from the bottom to the very top. Once all the insulation is in, team fills the holes in the brickwork and make sure the end result is invisible.

Cavity wall insulation can be made out of three types of materials:
  • Mineral Wool
  • Beads
  • Foamed Insulants
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Typically 35% of heat loss from a house escapes through uninsulated cavity walls. This can be reduced to around 10% by having it installed.
Cavity wall insulation is one of the most cost effective energy saving measure that most people can carry out on their homes.
On average you will save upto £260 per year on your energy bills and reduce the carbon emission (CO2) by 660 kg/ year.

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