External Wall Insulation

What is it?

External Wall Insulation (EWI) is a thermal efficient way to make your home warm and more comfortable, help save money on energy bills, and reduce the use of fossil fuels to boost the sustainability credentials of your property. It can also revamp the external appearance of your home.

How does it work?

EWI forms a layered shield to protect your home by stopping the heat escaping, regulating the temperature indoors, and helping to tackle condensation, damp and mould.

Simply put, this is done by adding Expanded Polystyrene Insulation (EPS) boards to the external walls of the property before coating with an adhesive basecoat, fibreglass mesh, a special type of silicone topcoat render, and completed with a decorative finish.

How is it installed?

EWI is achieved by firstly making sure the surface of your outer walls are free from dust and mould.

An adhesive basecoat is applied, before EPS boards are attached and reinforced with insulation fixings. Any existing facias, soffits, gutters and gullies can be replaced or amended to suit the property. Get in touch with us to see how these can be substituted or adjusted. Where possible, we always use 100mm EPS to give the best U-value to your building. But where 100mm isn’t achievable in some properties, we recommend using 50mm EPS, as a minimum, to boost the U-value of your home.

On top of the insulation fixings, another adhesive basecoat is applied, and fibreglass mesh is added to make it hardwearing and avoid future cracks. A substrate primer is then applied and finished off with a silicone topcoat render, which is highly breathable, has high water resistance and premium durability.


External wall installation during installation (close-up).

External Wall Insulation is a thermal-efficient way to make your home warm and more comfortable, help save money on energy bills, and reduce the use of fossil fuels to boost the sustainability credentials of your property. It can also revamp the external appearance of your home.

What are the benefits of External Wall Insulation?

Energy efficiency

Designed to increase the energy efficiency of your home, and in turn, make significant cost savings to your heating bills.

Protection

Improves weather proofing and provides sound resistance, keeping out the changing elements and reducing outside noise.

Comfort

Keep your home warm and cosy, for longer, by cutting out drafts and regulating internal temperature.

Health

Helps to reduce internal condensation and mould growth, while also preventing damp. But it’s worth knowing that it doesn’t solve rising or penetration damp.

Appearance

Covers any imperfections, cracks or gaps on the external appearance of your home or transforms the look of the outer walls.

Minimal disruption

Works are carried out externally, so there is little impact on your house routine and habits.

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Other considerations

If you live in a conservation area or live in a listed property, it’s a good idea to seek permission before getting EWI installed by getting in touch with your local council to find out. In some circumstances, planning for EWI will not be granted, so you can consider using Internal Wall Insulation (IWI).
External Wall Insulation being installed on a semi-detached house.

Contact us

We are PAS2030-19 and TrustMark certified and specialise in the installation of EWI in domestic and commercial properties.

Get in touch with us for a free home assessment and insulation survey today.