Cavity Wall Extraction

Experts In Cavity Wall Extraction, We Have Years Of Experience Dealing With Cavity Wall Extraction And Boast A Experienced Work Team


Get A Free Quote >

Cavity Wall Extraction

Cavity walls were first used in the 1930s with the sole purpose of making sure moisture doesn’t penetrate the exterior walls. In the process, two brick walls were built side by side, with an open space in between. Thus, even if water penetrated the outer wall, the inner wall would have been saved as water couldn’t reach it through the open space.

The insulation was added to the cavity walls only in the 70s with the purpose of keeping heat from going out and thus reduce the energy bills that exploded during that time.

Valid reasons to remove cavity wall insulation

The cavity wall is one of the best ways to make sure your home stays warm at lower energy bills. In some cases, depending on several factors, you should get your cavity wall insulation extracted, especially if you find yourself in one of the following situations:

Toxic insulation – When the process was first applied, aurea-formaldehyde based insulation was used.
Later it was determined that this type of insulation releases atoxic gas that is carcinogenic. This type of insulation is very easy to
install and has outstanding insulation properties, not allowing the heat to pass through but the risks outweigh any benefits it might have. If you have such insulation it is advisable you get it from the cavity wall extracted as soon as possible. Insulation was placed in unsupported property types, such as steel framed and timber-framed properties. When used on incorrect properties the insulation gets damp and it must be removed.

Damage to the insulation – this can occur due to water or fire. Flooding or chimney fire are the most often causes of insulation damage. In these cases, after the insulation is removed it’s advisable it is replaced with new one.

The building can’t benefit from cavity walls – such is the case, for example, when the house is constantly exposed to wind and rain. Using insulation is such environment would create a bridge between the outer and the inner walls and would lead the water to the interior walls. In addition, the insulation will most likely get damp.

The cavity wall insulation was installed badly – strangely this is the most common reason for getting the cavity wall
extracted. Although many people tend to want to do things themselves and there is enough how-to information online, it
is better to employ technicians who have experience in installing cavity walls to avoid problems in the future. Some
examples of poorly installed cavity walls: gaps with no insulation that causes damp or lack of glue when injecting the insulation. Installing the insulation properly takes time and a rush job doesn’t benefit anyone.

The insulation causes allergies – the only option if someone who lives in the house is allergic to the materials in the
insulation is to remove it. This is often the case when new owners move into the house. In case of allergies, it is advisable that the old insulation is replaced with a new one from a different material.

Damp issues are very common and can appear if the exterior walls are poorly maintained, there wasn’t any protection from
other buildings or trees and if there was extreme exposure to rain or wind. Most often is a combination of the three. In cases of damp, time is of the essence and the insulation must be removed as quickly as possible.

Get A Free Quote


By Clicking “Send” I agree for Holden Chambers to contact me. Holden Chambers take your privacy seriously and will only use your personal information to administer your account and to provide the products and services you have requested from us.

However, from time to time we would like to contact you with details of other products, offers & services we provide. If you consent to us contacting, you for this purpose please tick to say how you would like us to contact you:

TelephoneEmailPost,Text Message

Further information to how your information will be used is detailed within the
Privacy Policy and Terms & Conditions.

The insulation causes 

cavity extraction

allergies – the only option if someone who lives in the house is allergic to the materials in the
insulation is to remove it. This is often the case when new owners move into the house. In case of allergies, it is advisable that the old insulation is replaced with a new one from a different 

material.

Damp issues are very common and can appear if the exterior walls are poorly maintained, there wasn’t any protection from
other buildings or trees and if there was extreme exposure to rain or wind. Most often is a combination of the three. In cases of damp, time is of the essence and the insulation must be removed as quickly as possible.

The process

A wall insulation removal company will first take the bricks in order to expose the insulation and then simply suck it out with a
professional vacuum machine. The nozzle of the machine is placed using the drilling pattern. For some types of insulation, it must be first broken down with a specialized machine and only after that it is being sucked out.

The removal of the insulation begins at the bottom of the property and then moves up to check if there is any left insulation in the cavity walls.

Before the insulation removal process begins, several surveys that show the exact condition of both internal and external walls must be conducted. This survey will also check the area for damp.

Insulation materials

In some cases, you’ll want to extract the old, used or unsuitable insulation and replace it with another. Here are the most commonly-used types of cavity wall insulation:

Polystyrene beads and granules

While polystyrene beads are commonly supplied with a sticky resin that makes sure they stay together,
polystyrene granules will stick together without any help because of their shape. These materials are blown into the cavity with compressed air and can be safely used as insulation materials. This type of insulation is used commonly in narrower walls.

Mineral fiber (Mineral wool)

Mineral fiber is basically strands of fiberglass or mineral wool that are blown into the cavity wall with compressed air. The material is water resistant and doesn’t allow moisture to reach the interior walls.

Urea Formaldehyde (cavity foam)

Was the main insulation material when the process first began to be used and had a great advantage that smaller size holes were needed. This type of foam insulation is proved to be carcinogenic and thus it is not used anymore. Even more, if your house already has this type of insulation it should be removed.

Nowadays polystyrene foam is used mostly because it has the added benefit of helping stabilize the structure. However, when the only purpose of the insulation is to prevent heat from getting out, mineral fiber is just as efficient.

Removing the cavity wall insulation might be the last thing you want to do but in some cases, it is necessary so the best thing is to get to it as soon as possible. When removing the insulation the first thing to consider is the company you’ll employ to do the job. You need to do your research and only choose a reputable company that is certified in installing and extracting
insulation. As many of the problems are due to poorly installed insulation, you should take precautions to make sure
this will not happen again, especially if you’re just trying to replace the old, defective insulation.

Want to know more get in touch