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External Wall Insulation, or EWI, is the application of insulating boards onto the external walls of the house. The house is then finished with a high quality render. We offer a number of options to make your home look really unique – from your choice of colour, to brick slips, pebble-dash, and other speciality finishes.

 External Wall Insulation can offer a complete enclosure around the heat loss perimeter of your home which can be difficult to achieve with other forms of insulation.  Improving your homes energy efficiency in this way reduces heat loss substantially making it easier to heat and keep warm while saving you money on energy bills and reducing your carbon footprint. Suitable for all wall types but particularly homes constructed prior to the 1920’s which likely have solid walls. Installing External Wall Insulation will greatly improve the thermal performance of your property.

How Is External Wall Insulation Installed?

Firstly, if the property has existing render, a render test must be carried out to see if it is strong enough to hold the insulation. If not, all the existing render will need to be removed before attaching the insulation to the brickwork.


If the render test shows that the existing render is firmly held in place, the render can be smoothed. This will then be ready for the External Wall Insulation to be applied directly on to it.

Removing pipework from the outside of the building is another important step before installing any External Wall Insulation. These will be reinstalled at the end of the process (and may be extended in some instances).

We can also replicate architectural features of the property such as stone window cills and lintels along with other important features to maintain the character of your home.

Solid Wall Insulation

Advantages of External Wall Insulation

  • Lower heat loss and energy bills

  • Transform the appearance of your home​

  • Solve problems with the existing wall finish

  • Low maintenance system

  • Offers total weather protection; virtually eliminates internal wall condensation and removes the chilly, damp atmosphere

  • Warmer house in winter and cooler house in summer

  • No disruption inside your home and no reduction in internal floor area

  • Increased sound resistance

If you are interested, please don't hesitate and CONTACT US now to arrange a free consultation with a member of our team of experts.

Different types of Insulation

There are a number of different types of insulation that can be used for External Wall Insulation. Not all materials perform the same. For example, numerous other installers will offer expanded polystyrene boards to insulate your walls but they do not perform as well as other materials at insulating your home. 

Our Top Choice - Kingspan Phenolic Foam

Kingspan Phenolic Foam has excellent thermal performance comparatively to other products.

Phenolic foam also offers exceptional high vapour permeability, helping reduce condensation and prevent mould from forming.

Using a material with high degree of vapour permeability ensures your house can breathe.

The key factors you need to take into account for each type of insulation are:


  • Fire rating

  • Thermal performance (how well it insulates relative to its thickness)

  • Durability

  • Biodegradability and environmental impact

  • Moisture resistance

  • The breath-ability or vapour permeability (particularly for solid walls)

Considerations with EWI

  • It can be more difficult to get planning permission in a conservation area but we have had many successes and will work your planning application for you

  • Brick houses may need a simulated brick slip facing if rendering is deemed not appropriate

  • It needs a specialist to design the system and install it properly - this is what we do day in and day out

  • It must be correctly fixed so that it does not bridge the damp proof course or cause cold bridging

  • Rising damp must be rectified before fixing the insulation so that damp is not trapped inside

If you are interested, please don't hesitate and CONTACT US now to arrange a free consultation with a member of our team of experts.
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