Cavity Wall Insulation

What is Cavity Wall Insulation?
The cavity is a gap (50mm to 100mm) between the external wall and the internal wall of a house. Most properties built between the 1930s and 1980s have a cavity wall. In most cases, properties built before 1930's have solid walls and therefore it is not possible to cavity fill them. Properties built after 1985 should have cavity wall insulation as part of the building process. Cavity wall insulation is installed by reputable national insulation companies who we work with.

Cavity wall insulation What does a cavity wall looks like?
The brick pattern of typical cavity walls looks like the picture below. All bricks are laid lengthwise, and have all the same length.

You can also check whether you have cavity walls or not by measuring the thickness of the wall at any entrance doors or windows of your property. Cavity walls are at least 287.5cm (11 inches) thick brick to brick. If your walls are rendered, you will need to account for the thickness of the render or plasterboard on each side.

If you are still unsure then call us and one of our surveyors will come and have a look for you!


Why is it important to insulate my cavity wall?
The Government regards cavity wall insulation as one of the most effective cost and carbon saving measures that you can carry out on your property - which is why they are encouraging home owners who have unfilled wall cavities to take advantage of current installation grants.

Without cavity wall insulation, your wall allow heat to escape very easily. You will probably have noticed that shortly after you turn down your heating (gas, electricity, oil) your rooms begin to feel cold. Because of this you turn up your heating, probably even higher than before, to make the temperature more quickly more comfortable. The result? You use more fuel - you receive more costly utility bills! Depending on the size of your house and with current high fuel prices it can easily be £££+. Uninsulated cavity walls lose 33% or more of the heat generated within the property. So for an uninsulated house that’s £1 of heat escaping for every £3 spent heating it.

How are cavity walls insulated?
Insulation is done retrospectively by drilling through the outer layer of brickwork, normally through the mortar. We then blow mineral wool insulation into the cavity in your wall. This traps air in its fibres and forms a barrier that retains the heat INSIDE your home in winter, and in hot summer conditions keeps excessive heat OUTSIDE giving you all-year-round comfort. Once installed this should last the lifetime of your house. The injection holes are then filled with appropriately coloured cement.

How long does it take?
The whole process should take between 3 - 4 hours depending on the size of the property and is carried out by qualified and registered installers.

How much does it cost?
We offer 2 types of insulation:
White wool insulation, a glass mineral wool material injected in loose form, in masonry walls up to and including 25 m in height, with nominal cavity widths not less than 50 mm, in new and existing domestic and non-domestic buildings.
Polystyrene bead insulation, the polystyrene used for CWI is in the form of virgin pre-formed bead which is usually combined with a binding agent or adhesive at the time of injection. Polystyrene beads are produced to a specified size and density which remains unaltered during the installation process.
Please note that cavity wall insulation could be subsidized, contact us for more information.

Once the work is completed and payment is made, you will receive a 25 years Guarantee Certificate directly by the Cavity Insulation Guarantee Agency (CIGA). The Guarantee should be kept in a safe place as it may need to be produced in the event of a claim or if you sell your property. The Guarantee is passed on to any new owners of your home and Cavity Wall Insulation will be mentioned to anyone purchasing your property as required by the Home information pack and energy efficiency surveys, as well as the associated fuel and carbon cost savings.

Cavity Wall Insulation will make your property more attractive to prospective buyers since energy efficient homes are more and more taken into account in the valuation process.

I have solid walls, what are my options?
Solids walls loses a tremendous amount of heat. According to the Energy Saving Trust "solid walls let through twice as much heat as cavity walls do....Cavity walls are made of two layers with a small gap or cavity between them. Solid walls have no such gap, so they let more heat through". They can be insulated from the inside or from the outside.
External wall insulation involves fixing a layer of insulation material to the wall (usually PIR insulation boards), then covering it with a special type of render or cladding. The finish can be smooth, textured, painted, tiled, panelled, pebble-dashed, or finished with brick slips.
Internal wall insulation is usually done by building a stud wall filled with insulation.

Please contact us to arrange a free survey for your solid wall insulation.

Do I qualify for a grant?
More loft insulation but less storage space?
Insulating your loft is great and have many benefits, however storage space is often reduced substantially as a result.

For a minimum outlay, we can board your entire loft, or just a section of it, gaining invaluable storage space, without compromising on the insulation thickness in the loft.

Take advantage of our fantastic offers now! Click the link below to request a survey.

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