Cavity Wall Insulation

Cavity wall insulation can be carried out in most houses build from 1930 onwards. A cavity wall consists of two 4” walls built side by side with a space between, held together by wall ties. Sometimes this space will partially contain an insulated sheet. In which case, we can fill the void or if there is no sheet, we can fully fill the cavity with bead.

Cooper Insulation are NSAI approved to install both the Warmfill Super Silver bonded bead & Korefill DiamondSilver Bonded Bead products. Silver Bonded Bead is an expanded Polystyrene Bead which is injected into existing or newly built cavity walls with a bonding agent. Both products have the best insulation values for bead on the current market,You can read more on our products page.

How do I know if my house has a cavity and is suitable for insulation?

There are a few different tell tale signs to determine if a house is suitable for cavity wall insulation.

  1. Check meter box. You should be able to check at the base of the meter box when you open the door, to determine the blockwork used to construct your house. Where the power cable joins the meter, there will be a hole. If you look into this and see empty cavity or sheets, this means it is cavity suitable. If you see a hollow block then most likely it cannot be injected with bead.

  2. Similar house type. If other houses in the area/estate have had their walls pumped with bead, then your house should be suitable.

  3. Attic view. Sometimes the cavity may be exposed in the attic at the eaves so you can check if the walls are suitable.

  4. Vents: If you unscrew a wall vent you will be able to view the cavity through the void in the wall.

Insulation Used:

The video opposite demonstrates how the holes are drilled, the bonded bead is pumped into the wall and how the wall is filled.

We supply the leading manufactured bead types on the market resulting in optimum performances on every job.

Warmfill super silver bonded bead and Korefill diamond silver bonded bead. Please see certificates page to view product data.

Method of Installation:

borescope 22mm holes are bored into the external walls of the building. They can also be drilled internally if required, this method is commonly carried out on new builds. Holes are approximately the size of a one euro coin. Silver Bead along with an adhesive is pumped under pressure into the cavity.

A borescope test is carried out on all properties to ensure a cavity is present and the walls are suitable for cavity wall insulation. When insulating the building, the operatives follow the NSAI drill pattern as set out by the manufacturers of the bead.

All holes are patched by operatives after the pumping is complete.We endeavour to do our best when matching the existing render to satisfy the customer’s needs. This is done by mixing different dyes with mortar and sand to form a perfect blend in colour.Our operatives are trained installers who have been approved by the manufacturers to install silver bonded bead. All work is audited both externally and internally to ensure our quality remains at a premium level. All our operatives are all carded korefill and warmfill approved installers.


As a result of cavity wall insulation, the walls themselves become warmer which in most cases will eliminate the risk of condensation.

35 of heat loss in a home is through the walls so by insulating them, we can reduce the chances of heatloss by as much as 55%!

That’s a 35% per annum savings on your yearly budget straight by insulating your walls.

  • Address:
    Co. Meath
  • Phone: 046 9246730
  • Fax: 046 9246730
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