Free Cavity Wall Insulation in Wales

Can I get free Cavity Wall Insulation in Wales?

Under the Government ECO grant scheme, Cavity Wall Insulation in Wales is free about 95% of the cases that qualify for the Grant.

Grant qualification was widened in October 2018, so many people who did not qualify for this Grant before then, may now qualify

There is also a new flexible grant available which is based on where you live, and other factors, but it is not based on benefits.

We would of course be pleased to give a quote to those that do not qualify for a grant on either scheme.

What Insulation materials do you use to insulate the cavity walls?

We always install “SuperBead” Polystyrene Beads and not “RockWool” (fibre). Polystyrene Bead is a superior material for insulating Cavity Walls, but it is more expensive.

“SuperBead” cavity wall insulation is up to 20% more efficient than fibre insulation, such as Rockwool. This Cavity Wall Insulation reduces heat loss through the walls by about 70%. There are about 30% fewer holes than using fibre, and the holes are smaller.

“SuperBead” has been certified by the British Board of Agrément (BBA) for the following.

  • Thermal properties — “SuperBead” cavity wall insulation has a declared thermal conductivity of 0.035.
  • Water resistance — “SuperBead” cavity wall insulation will resist the transfer of water across the cavity.
  • Condensation — “SuperBead” cavity wall insulation will contribute to limiting the risk of condensation within the home.
  • Behaviour in relation to fire —  “SuperBead” cavity wall insulation does not prejudice the fire resistance properties of the wall.
  • Durability — “SuperBead” cavity wall insulation is durable, rot proof and water resistant. It is sufficiently stable to remain effective as an insulation for the life of the building.

The beads have been thoroughly tested and will not deteriorate over time. They are fully fire resistant. They have approval for use in even the most extreme of conditions.

How do you insulate a Cavity Wall?

Cavity walls can be insulated by blowing the insulation material into the cavity from the outside, but also from inside the house when appropriate.

Holes (about 22mm which is smaller than a 2p coin) are drilled in the walls in a set pattern.

This pattern is specified in the British Board of Agrément (BBA) certificate for the material that is being used.

The insulation, together with an adhesive, is then blown through the holes using special equipment. The adhesive “goes off” after about 20 minutes, thus holding the polystyrene beads together in a loose block. 

The holes are then sealed with cement which has been coloured to best match the colour of the existing mortar.

Filling cavity walls is not a “do it yourself” job. A 3 bed semi-detached house will take between 2 and 3 hours to complete.

Our trusted Installers are among the best in the business, and have been installing insulation since 1973. You will have a first class finish with the minimum of fuss and disruption. Most of our customers are amazed at how quickly and neatly the job can be carried out.

Is my house suitable for Cavity Wall Insulation?

If your home was built after 1925, it is likely that its external walls are made of two skins of brick with a gap (cavity) between them and held together with wall ties. This is called a Cavity Wall.

Free Cavity Wall Insulation fills that gap, keeping the warmth in and thus saving energy. It can also help reduce condensation inside the house if this is a problem on your external walls.

Your home will usually be suitable for free cavity wall insulation in Wales if:

  • the external walls are unfilled cavity walls
  • your cavity is at least 50mm wide
  • the masonry or brickwork of your property is in reasonably good condition

But it is not as simple as that.

As a part of the initial survey, we also carry out a Cavity Assessment Survey. This survey is administered and audited by CIGA ( the underwriter of the guarantee – so they won’t pass something that they are not prepared to guarantee.)

The suitability of the walls to be insulated will be assessed by way of an extensive survey of the property.

This survey includes drilling a small test hole into the wall of each elevation. A borescope will be inserted into each hole and the cavity will be examined. Photographs of the cavity will be taken, along with measurements of the depth of the cavity.

All walls are carefully examined and any remedial work noted , such as cracks, unfilled holes, etc. This remedial work has to be completed before the walls can be insulated

Gutters and down-pipes are examined for any leaks, spills or blocks and proper drainage.

The survey will take about 2 hours, and is free of charge.

The report and photographs are then uploaded to the CIGA platform for auditing.

This is a part of the greatly improved quality control measures found within the new free Cavity Wall Insulation in Wales Grant scheme.

To find out more, or to request a no obligation survey