EWI is a thermally floor insulation , protective and decorative exterior cladding process. It involves the application of 70mm rigid foam insulation (Kingspan, Celotex or similar) mechanically fixed to the walls and then clad with a sand and cement render or timber cladding. It’s an excellent solution for older properties built with solid brick.
EWI can significantly improve the energy efficiency of your home or commercial property. By limiting the amount of heat that escapes through the external walls and roof, you can reduce your dependence on artificial heating and cooling systems.
“From Design to Efficiency: Understanding External Insulation Systems for Sustainable Buildings
It can also reduce condensation on the wall which can lead to mold and rot and increase your indoor air quality. It can also help to prevent noise escaping from outside, helping you have a peaceful and comfortable living environment.
Unlike internal insulation, external is non-invasive so it won’t interfere with your daily routine and the walls remain fully functional during the works which can take around 3 weeks on average for a 100m2 house. It’s an excellent option for those who have access issues such as a tight alleyway that would make it difficult to use scaffolding or are located in a conservation area where planning permission may be required.
Most EWI installers will carry out a survey to determine the condition of your existing brickwork before advising you on the best solution. If the existing brickwork is in good condition, external wall insulation could be a suitable option as it doesn’t require the removal of any of the bricks. However, it’s still important to contact your local council for advice before starting the work as they may have specific rules regarding solid wall insulation in Conservation Areas or listed buildings.