Cavity Wall Insulation FAQS

  • I have condensation on my walls. Can cavity wall insulation stop this?

    Yes, in most cases cavity wall insulation will make your home warmer and prevent condensation and damp. However, it does depend on what’s causing the condensation. Our surveyor will be able to tell you what this is and give you advice on how to stop it.

  • Is it expensive to have cavity wall insulation installed?

    If you’re eligible for a grant, on average, it costs £199.00 (February 2016) to have cavity wall insulation installed. You may even be eligible for free cavity wall insulation. Once the insulation has been installed your heating bills will go down. Cavity wall insulation normally pays for itself in less than two years.

  • Is it possible to remove cavity wall insulation?

    Yes, we have many years’ experience doing this. We have specialist equipment that we use to extract cavity wall insulation with very little disruption to your property.

  • How do you remove cavity wall material?

    Before we remove any cavity wall insulation we do a full survey of your property. We then follow a strict procedure to make sure all the material is removed and that we return your home to its original condition.

  • What materials do you extract?

    We can remove all fibre products, loose or bonded urea formaldehyde foam and expanded polystyrene.

  • What are the main reasons for removing cavity wall insulation?

    We sometimes remove cavity wall insulation because: The insulation material is defective. Some materials can break down and slump within the cavity. It is likely that properties with this type of insulation will not have a guarantee in place. The cavity wall insulation was not installed properly. Things like incorrect drill patterns and incorrect filling sequence may be the cause. The property has been poorly maintained. Leaking pipes, cracks in brickwork, render or around windows, porous brickwork and mortar can all allow water to enter the cavity. This will cause the insulation material to get wet and damp to develop in the property. See our free guide for more information on how to maintain your property and protect your cavity wall insulation. There is an obstruction in the cavity, which is very common. If the obstruction is above the damp proof course or is creating a bridge across the cavity, it can cause isolated patches of damp. Over the years we have found tiles, cement bags and left over cement, broken wall ties, newspapers, cereal boxes, empty cans and vermin blocking cavities and compromising the insulation This is why we have our Check Before You Buy service, so you can be sure any property you’re thinking of buying is free of problem insulation.

  • How much does it cost to have cavity wall insulation removed?

    The cost of removing cavity wall insulation depends on what insulation materials were used. Some products give a loose fill while others are more compact. Access to the walls and any obstructions in the cavity will also have an effect the overall cost. Before we give you a quote we carry out a full survey. However, as a general rule of thumb, the cost to remove cavity wall insulation from a three bedroom semi-detached property is between £1,600 and £2,000 (February 2016). When asking a company for a quote please check if: They use a BBA assessed system (as we do) You’ll receive a full handover pack with a chartered surveyor’s inspection and sign off (as you will with us)

  • How long does it take to remove cavity wall insulation?

    How long it takes depends on the size of property and the insulation material used. Once we’ve done a full survey we can let you know how long we expect the work to take.

  • How can I be sure that all the insulation has been removed?

    Once we’ve removed the insulation from your walls we inspect them using a 360o video boroscope. This allows us to see 2m into the cavity in every direction. When the works are complete our chartered surveyor will sign a report to confirm that all materials and obstructions have been removed.

  • How do you monitor the quality of your work?

    One of our technical inspectors monitors and signs off all our extractions. We are one of only a very few companies who do this. You can read more about why and how we’re committed to best practice.

  • Can cavity wall insulation be associated with condensation or damp?

    Yes. If the insulation has been installed incorrectly or in an unsuitable property it can cause condensation and penetrating damp.

  • Can flooding affect my cavity wall insulation?

    Yes. Flooding can saturate the insulation. When this happens the insulation must be removed and the cavities allowed to dry out before any replacement insulation is installed.

  • I am buying a property. Will the EPC or valuation report cover the condition of the cavity wall insulation?

    No. As they don’t involve an internal inspection of the property’s cavities, neither an EPC or a home valuation report will identify any problems with pre-existing cavity wall insulation. However, our Check Before You Buy service does do this, which means you can be sure any property you’re thinking of buying is free of problem insulation.

  • I have just moved into a property I thought had cavity wall insulation. However, it is very cold. Why would this be?

    If the property has cavity wall insulation and is cold the insulation is likely to have been wrongly or poorly installed. We can survey the property to see if there are problems with the insulation and recommend how it can be put right. We have found that even new build properties can have very poor standards of insulation.

  • I’m thinking of doing some home improvements. Will this affect my cavity wall insulation?

    Yes, it is possible that home improvement works could damage your cavity wall insulation. If they do it will void your CIGA guarantee. Have a look at our page on home improvements for more information.

  • How long does it take to install cavity wall insulation?

    Not long. For example, it takes between two and three hours to install cavity wall insulation in a three bedroom semi-detached house.

  • Will installing cavity wall insulation make a mess?

    No. The insulation is injected from the outside, so the installers will not be working in your property. And our installers always make sure they leave the outside of your property in a clean and tidy condition.

  • What insulation material do you use?

    The only cavity wall insulation we install is EPS (expanded polystyrene) beads. This is fully accredited by the British Board of Agrément and guaranteed by the Cavity Insulation Guarantee Agency.

  • We have a conservatory and a lean-to. Will this be a problem?

    No. We have specialist safety and access equipment that was designed for use on hard to access properties.

  • My property is rendered. Will drilling to install the cavity wall insulation damage it?

    Installing EPS beads requires smaller and fewer drill holes than installing other insulation materials. Typically we only need to drill 4 holes per elevation where other materials require 16 drill holes per elevation. And, as we install the beads from the side of the property, there is no need to drill into the face of the wall.

  • My property has rubble in its cavities. Should I have cavity wall insulation installed?

    If your property has any kind of obstruction in its cavities you should not have cavity wall insulation installed until it is removed and the cavities are completely clear. If you don’t remove it, the obstruction can cause a void or bridge in the insulation that leads to penetrating damp.

  • Is your work guaranteed?

    Yes. The Cavity Insulation Guarantee Agency (CIGA) guarantee our cavity wall insulation work for 25 years.

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