Cavity Wall Extraction

Other types of insulation can lead to problems either because they have reached the end of their usefulness or because they were installed incorrectly. Either way, we can help. Most houses built in the UK since 1930 have been built with a cavity wall: a wall formed from two thicknesses of masonry with an air space between them, which are held together with wall ties. The air space ensures that any water which may enter the cavity simply drains down to the footings below the damp proof course, without crossing to the inner wall. Cavity Extraction removes the blockages and obstructions found in some cavities that create cold spots and damp problems.

Keeping a home built with cavity walls free from damp depends on the air space remaining almost entirely free from blockages. Obstructions between the two walls can form a bridge and allow moisture to penetrate through to the interior of the house. This moisture penetration can lead to damp and mould problems, if left untreated.Obstructions can occur for many reasons, including:


  • The cavity not being cleared correctly when the house was constructed
  • Having building work carried out on the house, such as replacing windows or fitting a conservatory
  • During general improvement and repairs on the house, such as fitting a balanced flue boiler system or a vent

Grants available

Depending on your households circumstances, funding could be available to contribute towards the cost of cavity extraction if combined with cavity filling.

The Benefits of Cavity Extraction:

  • Whole house solution, or partial cavity cleaning available
  • Resolves existing damp transference issues
  • Suitable for use on almost all cavity constructed properties
  • Ensures walls are clear of debris, ready to be insulated if required
  • No maintenance necessary
  • The process employs traditional building industry working practices and equipment, combined with specifically designed technology