External Wall Insulation (EWI)

What is external wall insulation?

External wall insulation systems totally encapsulate the building structure which is the most effective way of insulating a building, with least risk of cold bridging and interstitial condensation.

EWI systems require careful planning and system designs of the highest standard. Once external wall insulation has been completed this can give your house a whole new look and appearance.

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External wall insulation is a layer of insulation on the external wall to keep heat in and cold out

What is the difference between External wall insulation and Cavity wall insulation?

If your home was built before 1920, the external walls are probably solid rather than cavity walls. Cavity walls are made of two layers with a small gap or ‘cavity’ between them. Solid walls have no such gap, so they let more heat through. Solid walls can be insulated – either from the inside or the outside.

This will cost more than insulating a standard cavity wall, but the savings on your heating bills will be bigger too.

How do Eco-Green Deals install External Wall Insulation?

We can plan and install EWI with minimum disruption, as we work with leading system designers leading the industry our installation process once qualified and ready customers can expect an install to be as simple as;-

  • First our strip out team would attend to remove and prepare all building furniture such as satellite dishes and vents.
  • Secondly our installation team would install a layer of insulation material to the external wall with adhesive insulating the entire external wall area of the property.
  • astly the property would be coated in render and your building furniture reinstated giving your property the look good factor as well as being a warmer home.

How much could I save each year?

This will depend on how old and inefficient your existing boiler is and the fuel your boiler uses. Below are some examples of potential savings for a home heated by gas central heating.

Upgrading an old gas boiler with a programmer and room thermostat, with a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) could save you:

  • Fuel bill savings
  • Carbon dioxide savings
  • £260
  • 1,100 kg
  • £455
  • 1,900 kg
  • £175
  • 720 kg
  • £145
  • 610 kg

Estimates based on insulating a gas-heated home. Costs may vary significantly depending on level of work required. Above estimates are based on a typical install, ranging between a small flat and a large detached home.

Typical installation costs

  • External wall insulation: £8,000 to £22,000
  • Internal wall insulation: £3,500 to £14,000
*SOURCE: Energy Saving Trust 2016

Frequently Asked Questions – External Cavity Wall Insulation

A layer of insulation material is fixed to the outside walls of your house. It is then covered with a special type of render and can be finished to your liking — smooth, textured, painted, tiled, panelled, pebble-dashed, or finished with brick slips.

No. We will carry out your survey and also complete the necessary paperwork. We will require your authorisation though. Generally we require your signatures on forms but process all the submission for you to access the funding for you or your property.

EWI dramatically reduces the amount of heat lost through the walls of the building by trapping heat and preventing it escaping to the external atmosphere. The insulation boards that are installed have excellent resistance to heat transfer, meaning more of the heat you put into the building stays in the building, resulting in lower bills.

Each building will have specific requirements, so it is difficult to give a guide-figure. Instead, Eco-Green Deals is committed to giving you a free survey and quotation so you will have an exact figure, meaning you can budget from your own resources or explore ADDITIONAL grant routes with our help.

A typical installation takes 1 – 2 weeks. The installation is weather-dependent, however. The basecoats and renders cannot be applied when the outside temperature is below 5°C, nor in periods of extremely hot weather. Also, the system should be protected from the rain. We will take all steps to protect your installation, but there may be times when we have to withdraw from site due to extremes of weather. Should this happen, we will communicate fully with you so you are aware of any re-scheduling.

EWI is expected to last 30 years + and in most cases exceeds its expectancy.

You will receive a 10 year product and workmanship guarantee. For additional peace of mind, this can be extended (at cost) to 25 years.

You will need to use fixings that penetrate through the external wall insulation and into the substrate of the building, i.e. the original wall

Applying for Funding

Eco-Green Deals provide specialist advice in identifying a suitable heating system for your property whether it is NEW HEATING CONTROLS, A NEW A-RATED BOILER or even advising you with access to heating grants available through Eco-Green Deals.

If your boiler looks old and your energy bills feel expensive, then most likely you would be better off with our advice

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