Having cavity wall insulation installed couldn´t be easier! It is normally applied from the outside through small holes approximately the size of a 50 pence piece which are drilled approximately 1.5 metres apart all across the external walls. The insulation material is then injected through the holes, filling the cavity. The holes are then filled in to make as perfect a match as possible with the existing wall.

It´s a simple process and is normally completed within 3 to 4 hours, without damage or mess to your house or garden.

The main insulation materials used are glass or mineral fibre that is chopped up and blown into the cavities. Some installers use Bonded bead (white polystyrene beads) and Urea formaldehyde foam (white foam).

If you want to be even greener and have a sustainably manufactured material used in your property as opposed to the standard glass or mineral fibre, then please express your requirements upon application to the service or during your free no obligation assessment, and we will advise of the options available to you. Please be aware that alternative materials will incur additional costs.

All systems have been tested, assessed and approved by the British Board of Agrément or the British Standards Institution. The material is guaranteed for 25 years against any defects. (Guarantees are provided by the Cavity Insulation Guarantee Agency - CIGA).

If your home was built before 1935 the walls may not have a cavity or they may not be suitable to insulate. If your home was built from 1989 onwards, it was required to be insulated under the Building Regulations at the time of build. This may be with modern insulation or with Thermal Blocks. There is no funding available for cavity wall insulation for post 1989 properties under the Tesco Home Insulation Service.

Click here to read or download our guide to the Insulation Installation Process and what to expect.