Cavity Wall Insulation Extraction by Experts. If your home is effected by Damp or Mold and has cavity wall insulation then you may need it to be extracted. Remedial work should be carried out by professionals with the necessary expertise in this very specialist area of building repairs.
Known Problems with Cavity Wall Insulation
For us to understand cavity wall insulation problems then we need to initially look at why buildings are created with a cavity in the first place.
Basically a cavity between the two walls was thought to act as a barrier against damp. The outer wall would absorb weather and the air in between would prevent any damp moving into the building’s interior. This works fine until you fill that gap with a material that acts as a bridge between the cavity.
In some cases, and in certain areas this has become a serious problem, specially on gable ends that face continuous weather fronts. It is important to understand that the cavity had one job, and that was to keep rain out. It was not until later that newer materials were used on the inner wall to help control temperature.
Since the 80’s it has become a regulation that new homes will be built with insulation pre-installed to help further reduce energy costs. Most of the time this works fairly well as it still allows air to flow between the two walls. The insulation used is normally fibre board which is attached to the inner wall. These fibre boards actually help to prevent damp problems as they are designed to allow water to track down and never touch the inner wall.
Cavity Wall Insulation Problems with Mold and Damp in Older Pre 1980 buildings
Damp and mold Patch in need of cavity wall insulation extraction
Damp and Mold patch
Most damp problems were confined to Three mayor things.
Wall ties that had mortar attached and therefore acted as a bridge between the walls. Cavities that have filled at a low level with mortar droppings or building debris.
In coastal areas sand which has blown in through faulty air vents or roof damage.
All three of these problems could cause damp patches. These problems were easy to put right, simply requiring a few bricks to be removed and a simple clean up operation of the effected area of the cavity. Sometimes a wall tie might have been placed at a slightly angled trajectory, and this too could cause some damp or mould patches to appear. By replacing the effected wall ties the fault is still a reasonably simple problem to remedy.
Cavity Wall Insulation Problems in Post 1980’s Buildings
Unfortunately there have been many issues where Cavity Wall Insulation has been miss-sold or not installed correctly. This has lead to wide-scale issues of damp, condensation and Mold and other related issues with the construction of properties.
brown fibre cavity wall insulation Many people will be facing far more severe problems in the near future with cavity walls that have been filled with spun fibre. It has been proven that when too densely packed, these fibres actually allow water that has passed through the outer wall to travel across the gap and into the inner wall. This is a serious problem which requires immediate remedial action.
Buildings which are in zone 4 are the ones most subjected to driving rain. Many of these will at some time in the future clearly be the buildings most at risk. In those areas it has been reported that the fibre used as cavity wall insulation acts like blotting paper. The effect of this is that the insulation material retains and traps water that has ingressed into the cavity. Additionally this can be much worse if the fibre has been blown into a cavity which already had debris laying at the bottom.
Do you need Cavity Wall Insulation Extraction?
If you feel you may have problems it is worth checking out now before the problem becomes more severe. You can find out more information below.
We recommend anyone who is living in a house which has retro fitted insulation to have their home inspected by a qualified expert. If you consider that your home is at risk and may need cavity wall insulation extraction then contact us by calling us now.