Generally 65% of heat loss from an average building is through the wall areas. External 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. 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.
Installing EWI will add around between 70 – 100mm to your house, depending on the thickness of insulation used.
EWI is suitable for any building with solid walls. These can be: