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Home How-to Guides

How to install cavity wall insulation

Laura Rudd by Laura Rudd
12/04/2017
in Blog, Heating, How-to Guides, Insulation
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Looking to insulate your walls? Follow our handy hints to help you along the way.

Installing cavity wall insulation involves injecting an insulation material into the void between the inner and outer layer of brickwork to form an effective barrier that guards against heat loss. It will also keep your home at a constant temperature, regardless of weather fluctuations. Even better, this has a knock-on effect for your central heating, as it won’t have to work so hard to maintain an even temperature.

Cavity wall insulation keeps the heat in your home and can lower your fuel bills. Find out what types of cavity insulation are available below.

Types of cavity wall insulation

Currently, you can choose from three types of material. The choice will depend on your home – if in doubt call on a professional to talk you through the best option.

Urea Formaldehyde (UF) foam

Don’t let the name put you off! UF foam is a water-based material that’s directly injected into the brickwork. By mixing two active chemicals, the foam then expands to fill the cavity. The benefits of this type of insulation are:

  • It’s durable and doesn’t collapse from age or building vibrations
  • Resistant to attack by rot, fungi and vermin

Mineral wool

This material originates from glass fibre or rock, so it’s extremely tough. Before you insert it into a building’s cavity it must be treated with a water repellent chemical during the manufacturing process. Mineral wool is similar in appearance to the material used in loft insulation. Its benefits include:

  • Comparatively cheap and ideal if you’re on a tight budget
  • Resistant to water penetration

Expanded polystyrene beads

Similar to UF foam, individual expanded polystyrene beads are bound with an adhesive and blown into the cavity. This creates air pockets that form the insulating layer. This type of insulation is great as the material’s breathable properties allow the release of moisture through the walls whilst keeping the heat in.

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Laura Rudd

Laura Rudd

Proud mother to two boys, an avid DIY-er and interior design fan. Laura is always busy writing about ways to make everyone's lives easier - whether it's the odd how-to guide, life hack or general home inspiration.

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