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Insulation FAQs

Cavity Wall Insulation FAQs

What is a cavity wall?

Most modern houses have two external brick walls with an air-gap in between them. Although air acts a natural insulator, it is not as effective as the insulation material now used to insulate houses.

How do I know if I have cavity walls?

If your house was built after 1920 it is very likely that it has cavity walls. If it’s older it probably does not. An easy way to tell is to measure the thickness of your external walls by looking at a window or doorway. A cavity wall will be at least 260mm thick.

What is cavity wall insulation?

The insulation material can be fibre wool or polystyrene bonded beads.

Why is it free?

The government have committed to a target of cutting carbon emissions by 80% by 2050. One of the simplest ways to do this is to reduce the amount of energy we use in our homes. At the moment, the government have made funds available to insulate any house with cavity walls that are classed as ‘easy-to-treat’ for free. If your cavities are empty, We will fill them.

I have cavity walls — how do I know if they are already insulated?

Houses built from the 1990’s onwards were meant to be built with insulation material in the cavity wall, however properties built up to 2005 are still found to have been built without insulation. If your house was built between 1930 and 2005, and none of the previous owners have had insulation installed, it probably has empty cavity walls. If you are unsure, one of our trained surveyors can inspect your walls.

How is the insulation installed?

Our installers will drill a few small holes (22 – 25mm) into your outside walls, in the mortar between the bricks. A machine is then used to inject the insulation material into the walls. Once the process is complete, the holes are filled.

How long does it take to install?

For a typical 3 bedroom semi-detached house, the installation will take 2-3 hours.

How long will the insulation last?

For the lifetime of the building, as stated by the British Board of Agrément.

I rent my house — can I still get free insulation?

Yes, as long as we have permission from your landlord.

 

Loft Insulation FAQs

What is loft insulation?

Loft insulation is made from man-man mineral fibre usually made from silica sand, and has a wool-like appearance. It is supplied in rolls sealed in plastic packaging.

How long does loft insulation last for?

Loft insulation does not require any maintenance and should last indefinitely.

Why is it free?

The government have committed to a target of cutting carbon emissions by 80% by 2050. One of the simplest ways to do this is to reduce the amount of energy we use in our homes. At the moment, the government have made funds available for certain households to have their home insulated for free.

My loft is boarded — can I still get it insulated?

Yes, we can lay the insulation on top of the boards — even if there is already insulation under the boards.

I have some insulation in my loft — can I get it topped-up for free?

Yes, providing that the existing insulation is less than 100mm thick. We will top it up to the recommended 270mm. If you are unsure how much insulation you already have, one of our surveyors can inspect your loft and let you know if you are eligible for a top-up.

How long does it take to install?

A typical loft takes around 1 – 2 hours to insulate.

I rent my house — can I still get free insulation?

Yes, as long as we have permission from your landlord.

 

External Wall Insulation FAQs

What is EWI?

External wall insulation (EWI) is a solid insulation material attached to the outside of a building and covered with a protective render. It is suitable for old or unconventional buildings that don’t have cavity walls.

How durable is the insulation?

EWI systems are designed to withstand normal wear & tear and impacts. If part of the systems gets damaged, repair is quite straightforward.

How long does it last?

All systems are tested by the BBA for life-expectancy and achieve a rating in excess of 30 years.

Does it come with a warranty?

All EWI systems are covered by a 10-year manufacturer’s warranty relating to labour and materials. An extended warranty is available for additional cost.

How is EWI installed?

The system is installed in a number of steps. First, all external fittings will be removed. The insulation slabs are then attached to the wall — either with an adhesive or mechanically. Next, a render is applied to cover and protect the insulation, along with a decorative finish of your choice. Finally, all external fittings are replaced.

How long does it take to install?

Insulating an average size home will require around 9 – 10 days of work, spread over 3 – 4 weeks (to allow for drying time etc.) To minimise disruption, most people have their home insulated at the same time as having other work done.

What decorative finishes are available?

A number of finishes and colours are available, designed to blend in with the existing structure. These include a range of traditional aggregate finishes and a brick effect finish. The installers can discuss this with you before work begins.

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