External wall insulation (EWI) makes it possible to insulate a home by fitting insulation to the outside of the property, improving thermal performance, reducing energy consumption — therefore lowering energy bills — and updating the aesthetics.
EWI is also a great option if you’re considering applying for the new green homes grant, as you could get up to two thirds of the cost of these upgrades covered.
EWI systems are built up in several layers. The insulation board itself can be any one of a number of options which are each suited to different projects and their requirements. You can find an in-depth look at the options here.
After fixing the boards to the wall, the system is built up using multiple coats which will include:
- Reinforcement mesh
- Decorative finish or top coat render
You can even choose a brick-effect finish, so you can keep the traditional character of your property.
Since all the work takes place outside, there’s no need to move out during the renovation work. Choosing EWI also avoids interfering with plumbing and electrics and means space inside the home is not impacted, unlike with internal insulation which can reduce the inside space by up to 7%.