Replacing Cavity Wall Insulation

Extract Insulation Ltd was asked to survey a block of flats for a Wiltshire based housing association, upon inspection of the cavity wall insulation urea-formaldehyde foam was found. It was installed 30+ years ago. The inspection of the cavity was carried out via a borescope camera, we found deteriorated foam in various area, and the urea formaldehyde foam had shrunken and was now not filling the whole cavity.

The tenants of the properties’ were experiencing condensation and damp problems on the external walls. The client also requested cavity wall insulation to be re-installed on the properties. We advised the client about the pros & cons of re-insulating after extracting, it was then decided that bonded bead insulation would be the best solution for these flats. This being as fibre installs are more prone to having damp & insulation problems.

On the first day of the cavity wall insulation extraction it was evident that once the cavity fill was being removed there were other issues and problems arising. Rubble was being found in various locations at the bottom of the cavity; above damp course level & also on top of window lintels. The debris included broken bricks, roof tiles & a rat nest inside the cavity. Extra bricks were removed to perform a cavity clearance of the debris. Some re-pointing was carried out at certain areas of the rear elevation, due to the condition of the mortar and included replacement of various spalling bricks.

Once the cavity clearance was completed and it was confirmed that no further insulation filling or debris was inside the cavity, we appointed a sub-contractor to continue replacing cavity wall insulation with Polypearl Bead insulation.

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