External Wall Insulation (EWI)

What is EWI?

External Wall Insulation (EWI) creates a barrier that stops heat escaping through your walls. This is attached to the outside of your walls in several layers. The main insulating component is normally made from expanded polystyrene (EPS), phenol resin or mineral wool. EPS is most commonly used.
Most quality EPS EWI systems have, at minimum, a classification of B-s3, d2 and are therefore classed as fire retardant. This means they have been manufactured to achieve a very low combustion level which has been approved by an accredited fire classifications expert and deemed safe and fit for purpose.
If your home is insufficiently insulated, EWI can reduce heat loss and lower energy bills, making it a worthwhile investment in the medium to long term.
The lifespan of EWI will depend on the insulation type and installation quality. Generally, high-performance EWI systems last up to 25 years or more.

Why is it beneficial to have EWI?

Simply, EWI is an effective way to protect a building from damp; 2. it provides a barrier against moisture, improves airtightness and, when combined with ventilation offers a complete solution for any condensation/damp issues

If your home is poorly insulated, EWI can reduce heat loss and hence lower energy usage, making it a worthwhile investment in the medium to long term.
Does external wall insulation add value to your home? Yes, often it does. EWI will improve the visual appearance of your property adding to its resale value. Better insulation will also improve your home's Energy Performance Certificate (EPC) rating which is an influencing factor when selling or purchasing a property.

How we provide this service?

Step 1 – A survey is conducted to assess the suitability of the property
Step 2 – Scaffolding is erected as required.
Step 3 – Any fixtures and fixings that need removing or extending are modified
Step 4 – Plastic sheeting is laid down
Step 5 – Window protection film is fitted
Step 6 – The boards are prepared and fitted
Step 7 – The boards are mechanically fixed to the wall to secure them
Step 8 – A mesh coat is applied
Step 9 – Once the mesh coat is dry, a primer (top coat) is applied
Step 10 – Corners and edges of the system are protected with reinforced beading
Step 11 – Fixtures and fittings are reinstated and the protective sheeting is removed
Step 12 – Scaffolding is taken down

What benefits does EWI give?

1. Improves the thermal performance of a building
2. Improves the comfort of the living spaces.
3. Reduces noise levels
4. Improves the attractiveness of your home.
5. A more valuable, high-performance build.

Langley Properties work for;

- Private Clients

- Public Clients

- Grant Tendering

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Energy Efficiency


Sound Control


At Langley Properties Heating & Insulation Limited, we prioritize customer satisfaction above all else. We understand that each customer has unique needs and preferences, and we are dedicated to providing the best service solutions to meet those needs. That's why we encourage our customers to feel free to contact us at any time and for any reason.


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