If you’re underfloor insulation to make your home more energy efficient and reduce your heating bills, then external wall insulation (EWI) is a great option. However, it’s important to understand what it is and whether or not it’s right for your property before you take the plunge.
EWI is a thermally insulated, protective and decorative exterior cladding procedure that’s often used to upgrade solid masonry walls or in modern homes with uninsulated cavity walls. The process involves a layer of insulation such as expanded polystyrene, PIR or phenolic foam topped with a weatherproof render.
The main benefits of EWI are improved thermal performance, reduced fuel costs and greater comfort for the homeowner. In addition, it can help to regulate indoor temperatures throughout the year and promote environmental sustainability.
The Future of Energy Efficiency: External Insulation Systems Unveiled
One of the disadvantages of EWI is that it does change the appearance of your home. This may be a concern if you’re very attached to the look of your brick front.
Other issues with EWI can include damp problems due to moisture penetration through the cladding system. This can be caused by a difference in temperature between the warm internal air and the cold external air which encourages condensation. This can be minimised by insulating the frames of doors and windows, ensuring that there are no ‘cool bridges’. It’s also worth bearing in mind that EWI can be expensive and isn’t suitable for properties in conservation areas where planning permission may be required.