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External wall insulation (EWI) is a system of insulating the outside walls of a building. It can be applied to new or existing buildings and can be used to improve the energy efficiency, thermal comfort, and appearance of a property.

There are a number of different types of EWI systems available, but they all work in essentially the same way. A layer of insulation is attached to the outside of the walls and then covered with a render or cladding. This creates a barrier that prevents heat from escaping in the winter and entering in the summer.

EWI systems offer a number of benefits, including:

1. Reduced energy bills: EWI can help to reduce energy bills by up to 40%. This is because it prevents heat from escaping from your home in the winter and entering in the summer.
2. Improved thermal comfort: EWI makes your home more comfortable to live in all year round. By keeping your home warmer in the winter and cooler in the summer, it can help to reduce your reliance on heating and cooling systems.
3. Reduced carbon footprint: EWI can help to reduce your carbon footprint by reducing your energy consumption. This is beneficial for the environment and can help to save you money on your energy bills.
4. Improved air quality: EWI can help to improve air quality in your home by reducing the risk of damp and condensation. This can be beneficial for your health and well-being.
5. Reduced noise pollution: EWI can help to reduce noise pollution in your home by acting as a sound barrier. This can be particularly beneficial if you live in a noisy area.
6. Increased property value: EWI can help to increase the value of your property. This is because it makes your home more energy-efficient and comfortable to live in.
7. Improved aesthetics: EWI can improve the appearance of your home. There are a number of different render and cladding options available, so you can choose a system that complements the existing style of your property.
8. Protection from the elements: EWI can help to protect your home from the elements. It can help to prevent rain, snow, and wind from damaging your walls.
9. Increased lifespan of the building fabric: EWI can help to increase the lifespan of the building fabric by protecting it from the elements and reducing the risk of damp and condensation.
10. Fire resistance: Some types of EWI systems are fire resistant, which can help to improve the safety of your home.

If you are considering having EWI installed, it is important to choose a qualified installer. EWI is a complex system and it is important to have it installed correctly to ensure that you receive the full benefits.