Home Energy Specialists

How can I tell if my walls are suitable for Cavity wall insulation?

Cavity wall insulation is a great way to make a home warmer and cheaper to heat, but is it suitable for your home?

With the evenings beginning to draw in and the temperatures slowly dropping, a lot of us are beginning to think of ways to keep our properties warm and cosy.

Cavity wall insulation could be a solution worth thinking about.

We found out what you need to know.

1. How is my home losing heat?

According to the Energy Saving Trust, approximately one third of the heat lost in an uninsulated home escapes through the walls.

This is why insulating external walls is important, especially with winter on the horizon.

If your home was constructed in the last decade or so, it should have been built with external wall insulation, but most of us live in older properties, some of which have cavity walls and some don’t.

2. What is a cavity wall?

Cavity walls are exterior walls with a gap in the middle that can be filled with insulation.

As a general rule, houses built after 1920 have cavity walls and those built before don’t, but there are exceptions to the rule.

Look at the exterior brickwork to be sure – if the bricks are all long ones, then the walls have a cavity in the middle.

However, if the bricks are a mix of long and short ones, there’s no cavity because the short bricks go through the wall.

[Related story: Carbon monoxide poisoning: What is it, what are the symptoms, and what alarm should you get?]

3. How do I know if my walls are suitable?

Even if your home has cavity walls, cavity wall insulation isn’t necessarily recommended.

The cavity should be at least 5cm across, and the exterior walls must be in good condition.

Walls exposed to driving rain are not suitable for cavity wall insulation – having it installed in an unsuitable location can cause major problems, so it’s vital to first get advice from a reputable installer.

4. How can I get it installed?

Installing cavity wall insulation isn’t a DIY job – use an installer belonging to the National Insulation Association, the Cavity Insulation Guarantee Agency, or the British Board of Agrement.

The installer will make small holes in the exterior of the outside walls, blow insulation material, such as foam or beads, into them and then fill the holes.

They’ll need to access all the outside walls and if any of the walls adjoin a neighbour’s walls, they should fit a barrier to contain the insulation.

5. Can it save money?

The Energy Saving Trust says that cavity wall insulation in England, Scotland and Wales costs around £720 for a detached house, £475 for a semi and £370 for a mid-terraced house, though costs are subject to change.

Having the insulation fitted should save you around £275, £155 and £105 a year respectively on heating costs (assuming you have gas central heating), so it won’t take that long to get your money back.


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