What are cavity wall brushes?

Cavity brushes are installed on all party walls between joining properties that have not been previously insulated. They consist of two wires twisted together at the centre with filaments or bristles radiating from the core.

Cavity brushes are normally installed at the front and back of the property, before installation takes place. Blown insulation should not commence without them. The product was designed to separate properties, providing a substrate within the cavity wall for the insulation to be installed against. It prevents any insulation materials collapsing into the neighbouring property while retrofitting insulation.

Can cavity wall insulation be extracted from a property without interfering with the joining property?

It would be very unlikely but not impossible.

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