After loft insulation, this is the most cost-effective measure for reducing heat loss. It is a simple solution that can reduce heat loss through the wall by up to 60%.

There are various types of insulating materials that can be used – foam, mineral wool (rock or glass), or polystyrene beads.

The material you choose will be dependent on the property and your budget, but polystyrene beads are usually the best material for cavity wall insulation.

This is a project that would have to be carried about by an installer, so the investment cost is considerably high, but the payback period is still relatively short.

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