Why is cavity wall insulation extracted?

The extraction process is carried out for a number of reasons including:

  • Weathered pointing
  • Weather render with more than hairline cracking
  • Porous bricks or render
  • Wall painting in poor condition
  • Seals around windows or weathered quarry tile window sills
  • Finlock gutters
  • Perished roofing felt dripping into the cavity
  • Flood damage
  • Leaking rainwater goods

Over time on rare occasions, if subjected to excessive amounts of water from building defects, mineral wool cavity insulation can be overwhelmed. This results in wet material acting as a bridge across the cavity, rendering the material completely ineffective as an insulant.

In some cases, damp penetration through to the inside of the dwelling can occur and the only solution is removal.

How is the damaged material replaced?

The damaged cavity wall insulation is removed using a tried and trusted method, with full boroscope inspections to check that all has been removed.

cavity wall extraction

Compressed air is forced into one part of the wall and an industrial vacuum machine extracts the defective insulation from the bottom of the wall.

The original drilling pattern can be used if it is evident. All waste material is bagged during the extraction and no waste materials are left behind.


Can new insulation be installed?

Once your damaged cavity wall insulation has been extracted we can safely replace it with Diamond Bead - the most efficient cavity wall insulation available for existing properties.

Polystyrene bead is inherently and permanently waterproof. Even if EPS is inundated with water, it will drain quickly, dry and be restored to 100% of its previous effective condition.

We use the latest technologies in cavity wall insulation to avoid your newly-installed insulation from becoming damaged, and our work is covered by a 25 year guarantee from CIGA - The Cavity Insulation Guarantee Agency.

cavity wall insulaion replacement