Cavity Wall Insulation Installation

When it comes to cavity wall insulation installation, InsulGuard Cavity Shield is the only non-invasive cavity wall product available in Australia. Traditionally, products such as Supafil, Rockwool and foam wall insulations require drilling into the wall. Typically, these products would drill into the external brickwork along the mortar line roughly every 1.2m to cavity fill the wall. These holes can vary in size, from 25mm to 60mm in certain applications.

Drilling into the brickwork can create numerous problems for the home;

Visible Holes – Whilst it’s easy to patch mortar, these holes from the installation of inferior cavity wall insulation products can remain visible to the naked eye. On an exposed brickwork home, they can be easier to hide as the holes are drilled into the mortar line. With older homes, it becomes harder to blend the new mortar to the slightly discoloured mortar of the older brickwork, so you can sometimes still see these injection points. The major issue comes with rendered double brick homes. When the cavity wall insulation installation holes are drilled, they need to be repaired with mortar and often painted. Like any painting repair, it is often hard to hide where patches have been done which can detract from the aesthetics of your home.

Moisture Penetration – When cavity wall insulation is installed through drilling into the brickwork, the entry points used for the installation can also be an entry point for moisture. Even when the cavity wall insulation installation points are repaired with mortar, they do not bond with the existing mortar or do not penetrate the full depth of the brick. This means that rising damp and moisture can penetrate the external wall.

How Cavity Shield is Installed

Unlike other products, Cavity Shield cavity wall insulation is installed via the top of the brickwork. This means that there is no drilling into your brickwork, so the problems of visible holes and moisture penetration associated with other products are not issues. We access the top of the cavity through either the external roof or the internal roof. For Colorbond or tin roofs, we normally lift up the bottom corner of every third sheet, allowing us to place our pipework inside the cavity. For tiled roofs, it’s as simple as removing the odd tile every 3-5m or where there is a corner, doorway or floor length window.

The bead flows to every part of the double brick cavity wall due to the specialised machinery used to pump it in under extreme pressure, coupled with the unique properties of the spherical bead. Our specialised equipment sees the beads tipped into a hopper, where they are pumped at up to 200psi using our German engineered cavity wall insulation installation machine. They flow up the pipework and into your double brick cavity wall, which is controlled by both the pump/hopper operator and the installer on the roof.

As Cavity Shield is a loose bead product, it’s important that all preparatory work is completed before pumping commences. Every hole and defect is exposed through the pumping process, so it’s important that we block up possible leak points prior to installation. These commonly include silicone around windows and doors, replacing gas vents with our fine mesh vent, behind split system air conditioners and roller shutters. Most of our installs are completed with a follow up appointment to make sure there has been no leaks detected.

As the bead is pumped under extreme pressure, it fills every part of the double brick cavity. It wraps around windows, doors and corners due to the high flow properties of the bead. This is why we can claim to be the ONLY CAVITY WALL INSULATION PRODUCT WITH 100% COVERAGE.


To learn more about the installation process, check out our installation video below.

Contact the experts at InsulGuard for an obligation free quote on 1300 467 854 or by filling out the below form.

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Wall Insulation
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