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The insulation is typically fastened to the building using direct fixings such as self-tapping screws. All of these materials are used to prevent heat escaping through walls.

Technologies such as phenolic resin insulation are also available. This is the main insulation - it is normally made of either expanding polystyrene or mineral wool. The main insulating component is normally made of expanded polystyrene (EPS), phenolic boards or mineral wool. This barrier is attached to the outside of your walls in several layers. What is external wall insulation made up of?ĮWI creates a barrier that stops heat escaping through your walls. This is typically listed on the second page of the document.Ĭheck the Landmark register to see if your home has an EPC If you have an Energy Performance Certificate (EPC) for your home, then you will be able to see what type of construction the walls are. Properties of a non-traditional construction, such as system built or timber framed houses, are likely to have solid walls. with a pebble dash render) then it can be harder to identify. If some of the bricks are laid with the square end facing out then it is probably a solid wall. If the bricks are all rectangular and laid end-to-end then the wall is probably cavity. If your walls are brick, then the best way to tell if they are solid walls or cavity walls is to look at the brick pattern on the outside of the house. Many properties with cavity walls have already been insulated apart from what are known as “hard to treat” cavity walls that require more specialist treatment. Houses built with cavity walls do not need EWI because they already have a space within the walls that insulation can be injected in to. Solid wall properties with timber or steel frames.System built (concrete) properties that tend to have been built between the 1930s and 1980s.Older properties built before 1930 that have solid brick walls.What buildings can external wall insulation be used on?ĮWI is suitable for any building with solid walls. Installing EWI will add around 100mm to your house, depending on the thickness of insulation used. Two layers of material are used - one to offer insulation, and an outer layer of mineral or synthetic render to protect against weather and provide a decorative finish. *Figures taken from the Energy Saving TrustĮxternal wall insulation, also known as EWI and external solid wall insulation, is a type of insulation that is attached to the outside of your walls. There is funding available for domestic properties.