Internal Wall Insulation (IWI)

What is IWI?

Internal Wall Insulation (IWI) is a type of solid wall insulation where a layer of thermal insulating material is fixated on an internal wall. More heat is retained within the room itself; the goal of IWI is to support heat loss and therefore reduce your energy bills.
IWI should normally be at least 60mm thick, and may be up to 100mmm. The actual thickness required will depend on the material used - Insulation boards are fixed straight onto the wall using continuous ribbons of plaster or adhesive.
In general, fibreglass insulation (FI) is the best for internal walls. Affordability and easy installation make FI the most popular choice. FI is also very durable and will last for many years in addition to keeping energy bills low. FI is also fire-resistant and environmentally friendly.

Why is it beneficial to have IWI?

1. Save money on your energy bills.
2. Future-proof your home against rising energy costs.
3. Reduce your carbon emissions.
4. Make your home a more comfortable place to live.
5. Improve your property's EPC Rating.
6. Increase your property valuation.

How we provide this service?

Internal wall insulation is done by fitting rigid insulation boards to the wall, or by building a stud wall filled in with insulation material such as mineral wool fibre. Internal insulation: Is generally cheaper to install than external wall insulation.

What IWI gives?

Internal wall insulation provides a range of benefits that can help to improve the thermal efficiency of buildings and reduce heat loss. It is an effective way to insulate walls from both external weather conditions as well as neighbouring rooms, and it also helps to reduce energy bills over time.

Langley Properties work for;

- Private Clients

- Public Clients

- Grant Tendering

Carbon Footprint


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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