With retrofit cavity wall insulation installation, it’s important to consider how the double brick cavity will be accessed. Most products are unfortunately installed via drilling into either the external or internal skin and then blowing the product into the cavity. These holes are drilled every 1 – 1.5m to inject the fiberglass or Rockwool insulation into the cavity. These are then patched up at the completion of the job, which can require additional painting or rendering. It’s worth noting that there are often moisture problems with this type of method after the patching is completed.

The polystyrene insulation by InsulGuard is the only non-invasive retrofit cavity wall insulation available on the market. Instead of drilling into the brickwork, the bead is installed from the top of the cavity by removing a few tiles or sheets of tin. A tube is then inserted into the cavity, and the Cavity Shield is blown under pressure to fill the entire double brick cavity void.


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