This is how the cavities in the walls of your damp home will look like after the cavity wall insulation has been removed.

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Extraction of cavity wall insulation – the process explained.

The following insulation materials can be extracted from cavity walls

  • Loose or bonded polystyrene beads.
  • Rockwool Mineral Fibre
  • Instafibre
  • Whitewool Glass Mineral Fibre
  • Urea-formaldehyde

The extraction of cavity wall insulation process starts at the bottom of the property and gradually works its way up the property.

Firstly, some bricks are removed at the bottom of the property through which the insulation will be removed using an industrial vacuum machine. See photograph 1.

Holes (22mm) are drilled in the walls in an identical pattern to that used to insulate the walls.

removal of cavity wall insulation

Each hole is blocked using a “brush” see photograph 2.

Each brush is removed in turn and pressurised air is blown into the cavity. This breaks up the insulation allowing it to move freely in the cavity. At the same time, the industrial vacuum machine is sucking the loose insulation out of the cavity.

This process is repeated hole by hole, moving up the property wall until all the walls are blown and vacuumed.

Removing cavity wall insulation brushes 2

The removal of the cavity wall insulation process is constantly monitored.

The cavity is constantly monitored using boroscopes to ensure that ALL of the insulation has been removed.

Once it has all been removed, the bottom of the cavity is manually cleaned removing any rubble and the like.

The holes are then filled using colour-matched cement or paint. See photograph 3.

Removing cavity wall insulation holes filled coloured

The holes at the bottom of the walls (where the bricks were removed) are filled with a brick sized vent. See photograph 4.

These vents will allow the cavity to breathe and help the wall drying process.

The old insulation is bagged and removed from the property. No waste materials are left behind.

Removing cavity wall insulation vents fitted

A typical semi-detached house would take about a day and a bit to complete, and cost between £1,400 and £1,500 inc vat. This is subject to survey. We can give you an exact quote after the survey is completed.

Give us a call now on 0800 8 10 10 60 or 07960 799681 and speak to an expert adviser

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